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Posted to commits@ignite.apache.org by na...@apache.org on 2024/05/08 12:14:31 UTC

(ignite-extensions) branch master updated: IGNITE-22178 Fixed codestyle (#266)

This is an automated email from the ASF dual-hosted git repository.

namelchev pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/ignite-extensions.git


The following commit(s) were added to refs/heads/master by this push:
     new 4c23d612 IGNITE-22178 Fixed codestyle (#266)
4c23d612 is described below

commit 4c23d612873561448a1d7c258a119bc69ffaa1a2
Author: Aleksandr Nikolaev <56...@users.noreply.github.com>
AuthorDate: Wed May 8 15:14:24 2024 +0300

    IGNITE-22178 Fixed codestyle (#266)
---
 modules/aop-ext/pom.xml                            |   4 +-
 .../util/gridify/GridifyArgumentBuilder.java       |  12 +-
 .../test/gridify/ExternalNonSpringAopSelfTest.java |   6 +-
 modules/apache-license-gen/pom.xml                 |   4 +-
 modules/azure-ext/pom.xml                          |   4 +-
 modules/camel-ext/pom.xml                          |   4 +-
 .../stream/camel/IgniteCamelStreamerTest.java      |  28 ++---
 .../cdc/kafka/CdcKafkaReplicationAppsTest.java     |   4 +-
 .../ignite/cdc/kafka/CdcKafkaReplicationTest.java  |   6 +-
 modules/cloud-ext/pom.xml                          |   4 +-
 .../ipfinder/cloud/TcpDiscoveryCloudIpFinder.java  |  20 ++--
 .../cloud/TcpDiscoveryCloudIpFinderSelfTest.java   |  10 +-
 modules/flink-ext/pom.xml                          |   4 +-
 .../ignite/source/flink/TaskRemoteFilter.java      |   4 +-
 modules/flume-ext/pom.xml                          |   4 +-
 .../org/apache/ignite/stream/flume/IgniteSink.java |  12 +-
 .../apache/ignite/stream/flume/IgniteSinkTest.java |   8 +-
 .../ignite/stream/flume/TestEventTransformer.java  |  10 +-
 modules/gce-ext/pom.xml                            |   4 +-
 .../gce/TcpDiscoveryGoogleStorageIpFinder.java     |  18 +--
 .../core/src/test/config/examples.properties       |   2 +-
 .../examples/datagrid/SpatialQueryExample.java     |   4 +-
 .../core/src/test/config/examples.properties       |   2 +-
 .../core/src/test/config/examples.properties       |   2 +-
 modules/hibernate-ext/hibernate/pom.xml            |   4 +-
 .../HibernateL2CacheConfigurationSelfTest.java     |   8 +-
 .../cache/hibernate/HibernateL2CacheSelfTest.java  |   4 +-
 modules/jms11-ext/pom.xml                          |   4 +-
 .../apache/ignite/stream/jms11/JmsStreamer.java    |  40 +++----
 .../ignite/stream/jms11/IgniteJmsStreamerTest.java |  16 +--
 .../ignite/stream/jms11/TestTransformers.java      |  12 +-
 .../stream/kafka/connect/IgniteSourceTask.java     |   4 +-
 .../stream/kafka/KafkaIgniteStreamerSelfTest.java  |   6 +-
 .../kafka/connect/IgniteSinkConnectorTest.java     |   6 +-
 .../kafka/connect/IgniteSourceConnectorTest.java   |   2 +-
 modules/mesos-ext/pom.xml                          |   4 +-
 .../org/apache/ignite/mesos/IgniteScheduler.java   |  30 ++---
 .../ignite/mesos/resource/IgniteProvider.java      |  12 +-
 .../ignite/mesos/resource/ResourceHandler.java     |   4 +-
 .../ignite/mesos/IgniteSchedulerSelfTest.java      |  26 ++---
 .../CatboostClassificationModelParserExample.java  |   4 +-
 .../inference/h2o/H2OMojoModelParserExample.java   |   6 +-
 .../xgboost/XGBoostModelParserExample.java         |   4 +-
 .../encoding/TargetEncoderExample.java             |   8 +-
 .../testsuites/IgniteExamplesMLTestSuite.java      |   4 +-
 .../ml/catboost/CatboostClassificationModel.java   |  13 ++-
 .../ml/catboost/CatboostRegressionModel.java       |   6 +-
 .../ml/sparkmodelparser/SparkModelParser.java      |  20 ++--
 .../ignite/ml/clustering/gmm/GmmPartitionData.java |   6 +-
 .../ignite/ml/clustering/gmm/GmmTrainer.java       |  30 ++---
 .../OnMajorityPredictionsAggregator.java           |   6 +-
 .../impl/cache/CacheBasedDatasetBuilder.java       |   4 +-
 .../ml/dataset/impl/cache/util/ComputeUtils.java   |   4 +-
 .../environment/deploy/DeployingContextImpl.java   |  12 +-
 .../ignite/ml/inference/json/JacksonHelper.java    |   8 +-
 .../knn/classification/KNNClassificationModel.java |  12 +-
 .../main/java/org/apache/ignite/ml/math/Blas.java  |  10 +-
 .../java/org/apache/ignite/ml/math/Tracer.java     |   4 +-
 .../math/primitives/vector/impl/SparseVector.java  |   4 +-
 .../compound/CompoundNaiveBayesModel.java          |   6 +-
 .../compound/CompoundNaiveBayesTrainer.java        |   6 +-
 .../discrete/DiscreteNaiveBayesTrainer.java        |  20 ++--
 .../gaussian/GaussianNaiveBayesTrainer.java        |  60 +++++-----
 .../ml/preprocessing/encoding/EncoderTrainer.java  |   8 +-
 .../onehotencoder/OneHotEncoderPreprocessor.java   |   6 +-
 .../selection/paramgrid/ParameterSetGenerator.java |   4 +-
 .../apache/ignite/ml/tree/DecisionTreeTrainer.java |   4 +-
 .../util/SimpleStepFunctionCompressor.java         |   8 +-
 .../RandomForestClassifierTrainer.java             |   4 +-
 .../gmm/NewComponentStatisticsAggregatorTest.java  |  18 +--
 .../impl/cache/CacheBasedDatasetBuilderTest.java   |  12 +-
 .../ignite/ml/math/distances/DistanceTest.java     |  12 +-
 .../discrete/DiscreteNaiveBayesModelTest.java      |   4 +-
 .../preprocessing/encoding/EncoderTrainerTest.java |   4 +-
 .../ml/xgboost/parser/XGBoostModelParserTest.java  |   4 +-
 modules/mqtt-ext/pom.xml                           |   4 +-
 modules/osgi-ext/osgi-karaf/pom.xml                |   4 +-
 modules/osgi-ext/osgi/pom.xml                      |   4 +-
 .../classloaders/BundleDelegatingClassLoader.java  |   8 +-
 .../osgi/activators/BasicIgniteTestActivator.java  |   6 +-
 .../PerformanceStatisticsReportBuilder.java        |  12 +-
 .../PerformanceStatisticsReportSelfTest.java       |   4 +-
 modules/pub-sub-ext/pom.xml                        |   2 +-
 .../ignite/stream/pubsub/PubSubStreamer.java       |  14 +--
 .../ignite/stream/pubsub/MockPubSubServer.java     |  22 ++--
 .../stream/pubsub/PubSubStreamerSelfTest.java      |  34 +++---
 .../stream/rocketmq/RocketMQStreamerTest.java      |  18 +--
 .../ignite/stream/rocketmq/TestRocketMQServer.java |  10 +-
 .../examples/spark/JavaIgniteCatalogExample.java   |  12 +-
 .../ignite/examples/spark/SharedRDDExample.java    |  12 +-
 modules/spark-ext/spark/pom.xml                    |   4 +-
 .../spring-boot-autoconfigure/pom.xml              |   4 +-
 modules/spring-cache-ext/pom.xml                   |   4 +-
 .../GridSpringCacheManagerMultiJvmSelfTest.java    |   4 +-
 .../ignite/cache/spring/SpringCacheTest.java       |  18 +--
 modules/spring-data-ext/spring-data/pom.xml        |   4 +-
 .../repository/config/DynamicQueryConfig.java      |  22 ++--
 .../repository/query/IgniteQueryGenerator.java     |   8 +-
 .../repository/query/IgniteRepositoryQuery.java    | 126 ++++++++++-----------
 .../springdata/repository/query/QueryUtils.java    |   8 +-
 .../springdata/repository/query/StringQuery.java   |  46 ++++----
 .../support/IgniteRepositoryFactory.java           |   8 +-
 .../springdata/IgniteSpringDataCrudSelfTest.java   |  20 ++--
 .../IgniteIndexedSessionRepositoryTest.java        |   4 +-
 modules/spring-tx-ext/spring-tx/pom.xml            |   4 +-
 modules/ssh-ext/pom.xml                            |   4 +-
 .../util/nodestart/StartNodeCallableImpl.java      |   6 +-
 modules/storm-ext/pom.xml                          |   4 +-
 .../stream/storm/StormIgniteStreamerSelfTest.java  |  12 +-
 modules/topology-validator-ext/pom.xml             |   4 +-
 modules/twitter-ext/pom.xml                        |   4 +-
 modules/yarn-ext/pom.xml                           |   4 +-
 .../org/apache/ignite/yarn/ApplicationMaster.java  |   6 +-
 .../org/apache/ignite/yarn/ClusterProperties.java  |  16 +--
 .../org/apache/ignite/yarn/IgniteYarnClient.java   |  14 +--
 .../apache/ignite/yarn/utils/IgniteYarnUtils.java  |  14 +--
 modules/zeromq-ext/pom.xml                         |   4 +-
 .../ignite/stream/zeromq/IgniteZeroMqStreamer.java |  14 +--
 .../stream/zeromq/IgniteZeroMqStreamerTest.java    |   4 +-
 .../ipfinder/zk/TcpDiscoveryZookeeperIpFinder.java |  12 +-
 120 files changed, 667 insertions(+), 612 deletions(-)

diff --git a/modules/aop-ext/pom.xml b/modules/aop-ext/pom.xml
index 5fb1e387..b201c3ed 100644
--- a/modules/aop-ext/pom.xml
+++ b/modules/aop-ext/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/aop-ext/src/main/java/org/apache/ignite/internal/util/gridify/GridifyArgumentBuilder.java b/modules/aop-ext/src/main/java/org/apache/ignite/internal/util/gridify/GridifyArgumentBuilder.java
index 7c35d129..c7a48040 100644
--- a/modules/aop-ext/src/main/java/org/apache/ignite/internal/util/gridify/GridifyArgumentBuilder.java
+++ b/modules/aop-ext/src/main/java/org/apache/ignite/internal/util/gridify/GridifyArgumentBuilder.java
@@ -142,12 +142,12 @@ public final class GridifyArgumentBuilder {
 
         assert paramCls != null;
 
-        Object paramValue = GridifyUtils.collectionToParameter(paramCls, input);
+        Object paramVal = GridifyUtils.collectionToParameter(paramCls, input);
 
-        if (paramValue == null)
+        if (paramVal == null)
             throw new IgniteCheckedException("Failed to create task argument for type: " + paramCls.getName());
 
-        mtdArgs[arg.getParamIndex()] = paramValue;
+        mtdArgs[arg.getParamIndex()] = paramVal;
 
         return res;
     }
@@ -180,12 +180,12 @@ public final class GridifyArgumentBuilder {
 
         assert paramCls != null;
 
-        Object paramValue = GridifyUtils.collectionToParameter(paramCls, input);
+        Object paramVal = GridifyUtils.collectionToParameter(paramCls, input);
 
-        if (paramValue == null)
+        if (paramVal == null)
             throw new IgniteException("Failed to create job argument for type: " + paramCls.getName());
 
-        mtdArgs[arg.getParamIndex()] = paramValue;
+        mtdArgs[arg.getParamIndex()] = paramVal;
 
         return res;
     }
diff --git a/modules/aop-ext/src/test/java/org/test/gridify/ExternalNonSpringAopSelfTest.java b/modules/aop-ext/src/test/java/org/test/gridify/ExternalNonSpringAopSelfTest.java
index 41ba08de..b51ae908 100644
--- a/modules/aop-ext/src/test/java/org/test/gridify/ExternalNonSpringAopSelfTest.java
+++ b/modules/aop-ext/src/test/java/org/test/gridify/ExternalNonSpringAopSelfTest.java
@@ -443,7 +443,7 @@ public class ExternalNonSpringAopSelfTest extends GridCommonAbstractTest {
 
         info("Start Gridify test with Default AOP Task and exception in Deployment Mode : " + depMode);
 
-        boolean isException = false;
+        boolean ex = false;
 
         try {
             startGrid();
@@ -455,7 +455,7 @@ public class ExternalNonSpringAopSelfTest extends GridCommonAbstractTest {
         catch (ExternalGridifyException e) {
             info("@Gridify method gridifyDefaultException(0) returns exception: " + e);
 
-            isException = true;
+            ex = true;
         }
         catch (Exception e) {
             e.printStackTrace();
@@ -467,7 +467,7 @@ public class ExternalNonSpringAopSelfTest extends GridCommonAbstractTest {
             stopGrid();
         }
 
-        if (!isException)
+        if (!ex)
             fail("@Gridify method gridifyDefaultException(0) does not return any exception.");
     }
 
diff --git a/modules/apache-license-gen/pom.xml b/modules/apache-license-gen/pom.xml
index 09a07451..2b342194 100644
--- a/modules/apache-license-gen/pom.xml
+++ b/modules/apache-license-gen/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/azure-ext/pom.xml b/modules/azure-ext/pom.xml
index 6e3fc436..c5b056ba 100644
--- a/modules/azure-ext/pom.xml
+++ b/modules/azure-ext/pom.xml
@@ -17,7 +17,9 @@
   limitations under the License.
 -->
 
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/camel-ext/pom.xml b/modules/camel-ext/pom.xml
index 46423320..fd452701 100644
--- a/modules/camel-ext/pom.xml
+++ b/modules/camel-ext/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/camel-ext/src/test/java/org/apache/ignite/stream/camel/IgniteCamelStreamerTest.java b/modules/camel-ext/src/test/java/org/apache/ignite/stream/camel/IgniteCamelStreamerTest.java
index 425cb436..06e581e5 100644
--- a/modules/camel-ext/src/test/java/org/apache/ignite/stream/camel/IgniteCamelStreamerTest.java
+++ b/modules/camel-ext/src/test/java/org/apache/ignite/stream/camel/IgniteCamelStreamerTest.java
@@ -107,12 +107,12 @@ public class IgniteCamelStreamerTest extends GridCommonAbstractTest {
             url = "http://localhost:" + port + "/ignite";
         }
 
-        DefaultCamelContext context = new DefaultCamelContext();
+        DefaultCamelContext ctx = new DefaultCamelContext();
         // create Camel streamer
         dataStreamer = grid().dataStreamer(DEFAULT_CACHE_NAME);
         streamer = createCamelStreamer(dataStreamer);
-        streamer.setCamelContext(context);
-        producerTemplate = new DefaultProducerTemplate(context);
+        streamer.setCamelContext(ctx);
+        producerTemplate = new DefaultProducerTemplate(ctx);
         producerTemplate.start();
     }
 
@@ -207,11 +207,11 @@ public class IgniteCamelStreamerTest extends GridCommonAbstractTest {
     @Test
     public void testUserSpecifiedCamelContext() throws Exception {
 
-        CamelContext context = streamer.getCamelContext();
+        CamelContext ctx = streamer.getCamelContext();
 
         final AtomicInteger cnt = new AtomicInteger();
-        context.setTracing(true);
-        context.addLifecycleStrategy(new LifecycleStrategySupport() {
+        ctx.setTracing(true);
+        ctx.addLifecycleStrategy(new LifecycleStrategySupport() {
             @Override public void onEndpointAdd(Endpoint endpoint) {
                 cnt.incrementAndGet();
             }
@@ -240,11 +240,11 @@ public class IgniteCamelStreamerTest extends GridCommonAbstractTest {
     @Test
     public void testUserSpecifiedCamelContextWithPropertyPlaceholders() throws Exception {
         // Create a CamelContext with a custom property placeholder.
-        CamelContext context = new DefaultCamelContext();
+        CamelContext ctx = new DefaultCamelContext();
 
         PropertiesComponent pc = new PropertiesComponent("camel.test.properties");
 
-        context.setPropertiesComponent(pc);
+        ctx.setPropertiesComponent(pc);
 
         // Replace the context path in the test URL with the property placeholder.
         url = url.replaceAll("/ignite", "{{test.contextPath}}");
@@ -253,9 +253,9 @@ public class IgniteCamelStreamerTest extends GridCommonAbstractTest {
         streamer = createCamelStreamer(dataStreamer);
 
         streamer.setSingleTupleExtractor(singleTupleExtractor());
-        streamer.setCamelContext(context);
+        streamer.setCamelContext(ctx);
 
-        producerTemplate = new DefaultProducerTemplate(context);
+        producerTemplate = new DefaultProducerTemplate(ctx);
         producerTemplate.start();
 
         // Subscribe to cache PUT events.
@@ -290,11 +290,11 @@ public class IgniteCamelStreamerTest extends GridCommonAbstractTest {
             fail("Streamer started; should have failed.");
         }
         catch (IgniteException ignored) {
-            CamelContext context = streamer.getCamelContext();
-            ServiceStatus status = context.getStatus();
+            CamelContext ctx = streamer.getCamelContext();
+            ServiceStatus status = ctx.getStatus();
             assertEquals("streamer should be in a stopped state, instead is " + status, status, ServiceStatus.Stopped);
-            assertEquals("endpoint registry has > 0 elements, size: " + context.getEndpointRegistry().size(),
-                context.getEndpointRegistry().size(), 0);
+            assertEquals("endpoint registry has > 0 elements, size: " + ctx.getEndpointRegistry().size(),
+                ctx.getEndpointRegistry().size(), 0);
         }
     }
 
diff --git a/modules/cdc-ext/src/test/java/org/apache/ignite/cdc/kafka/CdcKafkaReplicationAppsTest.java b/modules/cdc-ext/src/test/java/org/apache/ignite/cdc/kafka/CdcKafkaReplicationAppsTest.java
index 27d900d1..bfa491a1 100644
--- a/modules/cdc-ext/src/test/java/org/apache/ignite/cdc/kafka/CdcKafkaReplicationAppsTest.java
+++ b/modules/cdc-ext/src/test/java/org/apache/ignite/cdc/kafka/CdcKafkaReplicationAppsTest.java
@@ -144,10 +144,10 @@ public class CdcKafkaReplicationAppsTest extends CdcKafkaReplicationTest {
         if (clientType == ClientType.THIN_CLIENT) {
             cfg = "/replication/kafka-to-ignite-client.xml";
 
-            String addresses = Arrays.stream(hostAddresses(dest)).map(addr -> "<value>" + addr + "</value>")
+            String addrs = Arrays.stream(hostAddresses(dest)).map(addr -> "<value>" + addr + "</value>")
                 .collect(Collectors.joining());
 
-            params.put(HOST_ADDRESSES, addresses);
+            params.put(HOST_ADDRESSES, addrs);
         }
         else {
             cfg = "/replication/kafka-to-ignite.xml";
diff --git a/modules/cdc-ext/src/test/java/org/apache/ignite/cdc/kafka/CdcKafkaReplicationTest.java b/modules/cdc-ext/src/test/java/org/apache/ignite/cdc/kafka/CdcKafkaReplicationTest.java
index 685c50b1..9b43dc07 100644
--- a/modules/cdc-ext/src/test/java/org/apache/ignite/cdc/kafka/CdcKafkaReplicationTest.java
+++ b/modules/cdc-ext/src/test/java/org/apache/ignite/cdc/kafka/CdcKafkaReplicationTest.java
@@ -249,11 +249,11 @@ public class CdcKafkaReplicationTest extends AbstractReplicationTest {
         EmbeddedKafkaCluster kafka = curKafka;
 
         if (kafka == null) {
-            Properties brokerProperties = new Properties();
+            Properties props = new Properties();
 
-            brokerProperties.put("auto.create.topics.enable", "false");
+            props.put("auto.create.topics.enable", "false");
 
-            kafka = new EmbeddedKafkaCluster(1, brokerProperties);
+            kafka = new EmbeddedKafkaCluster(1, props);
 
             kafka.start();
         }
diff --git a/modules/cloud-ext/pom.xml b/modules/cloud-ext/pom.xml
index 69b160bb..749a3da6 100644
--- a/modules/cloud-ext/pom.xml
+++ b/modules/cloud-ext/pom.xml
@@ -17,7 +17,9 @@
   limitations under the License.
 -->
 
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/modules/cloud-ext/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/cloud/TcpDiscoveryCloudIpFinder.java b/modules/cloud-ext/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/cloud/TcpDiscoveryCloudIpFinder.java
index 57e8c50d..f0409afc 100644
--- a/modules/cloud-ext/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/cloud/TcpDiscoveryCloudIpFinder.java
+++ b/modules/cloud-ext/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/cloud/TcpDiscoveryCloudIpFinder.java
@@ -182,7 +182,7 @@ public class TcpDiscoveryCloudIpFinder extends TcpDiscoveryIpFinderAdapter {
     @Override public Collection<InetSocketAddress> getRegisteredAddresses() throws IgniteSpiException {
         initComputeService();
 
-        Collection<InetSocketAddress> addresses = new LinkedList<>();
+        Collection<InetSocketAddress> addrs = new LinkedList<>();
 
         try {
             Set<NodeMetadata> nodes;
@@ -201,17 +201,17 @@ public class TcpDiscoveryCloudIpFinder extends TcpDiscoveryIpFinderAdapter {
                     continue;
 
                 for (String addr : metadata.getPrivateAddresses())
-                    addresses.add(new InetSocketAddress(addr, 0));
+                    addrs.add(new InetSocketAddress(addr, 0));
 
                 for (String addr : metadata.getPublicAddresses())
-                    addresses.add(new InetSocketAddress(addr, 0));
+                    addrs.add(new InetSocketAddress(addr, 0));
             }
         }
         catch (Exception e) {
             throw new IgniteSpiException("Failed to get registered addresses for the provider: " + provider, e);
         }
 
-        return addresses;
+        return addrs;
     }
 
     /** {@inheritDoc} */
@@ -357,17 +357,17 @@ public class TcpDiscoveryCloudIpFinder extends TcpDiscoveryIpFinderAdapter {
 
                     ctxBuilder.credentials(identity, credential);
 
-                    Properties properties = new Properties();
-                    properties.setProperty(Constants.PROPERTY_SO_TIMEOUT, JCLOUD_CONNECTION_TIMEOUT);
-                    properties.setProperty(Constants.PROPERTY_CONNECTION_TIMEOUT, JCLOUD_CONNECTION_TIMEOUT);
+                    Properties props = new Properties();
+                    props.setProperty(Constants.PROPERTY_SO_TIMEOUT, JCLOUD_CONNECTION_TIMEOUT);
+                    props.setProperty(Constants.PROPERTY_CONNECTION_TIMEOUT, JCLOUD_CONNECTION_TIMEOUT);
 
                     if (!F.isEmpty(regions))
-                        properties.setProperty(LocationConstants.PROPERTY_REGIONS, keysSetToStr(regions));
+                        props.setProperty(LocationConstants.PROPERTY_REGIONS, keysSetToStr(regions));
 
                     if (!F.isEmpty(zones))
-                        properties.setProperty(LocationConstants.PROPERTY_ZONES, keysSetToStr(zones));
+                        props.setProperty(LocationConstants.PROPERTY_ZONES, keysSetToStr(zones));
 
-                    ctxBuilder.overrides(properties);
+                    ctxBuilder.overrides(props);
 
                     computeService = ctxBuilder.buildView(ComputeServiceContext.class).getComputeService();
 
diff --git a/modules/cloud-ext/src/test/java/org/apache/ignite/spi/discovery/tcp/ipfinder/cloud/TcpDiscoveryCloudIpFinderSelfTest.java b/modules/cloud-ext/src/test/java/org/apache/ignite/spi/discovery/tcp/ipfinder/cloud/TcpDiscoveryCloudIpFinderSelfTest.java
index 47b93c18..fb1d7279 100644
--- a/modules/cloud-ext/src/test/java/org/apache/ignite/spi/discovery/tcp/ipfinder/cloud/TcpDiscoveryCloudIpFinderSelfTest.java
+++ b/modules/cloud-ext/src/test/java/org/apache/ignite/spi/discovery/tcp/ipfinder/cloud/TcpDiscoveryCloudIpFinderSelfTest.java
@@ -102,18 +102,18 @@ public class TcpDiscoveryCloudIpFinderSelfTest extends
         else
             ipFinder.setCredential(IgniteCloudTestConfiguration.getSecretKey(provider));
 
-        Collection<InetSocketAddress> addresses = ipFinder.getRegisteredAddresses();
+        Collection<InetSocketAddress> addrs = ipFinder.getRegisteredAddresses();
 
-        for (InetSocketAddress addr : addresses)
+        for (InetSocketAddress addr : addrs)
             info("Registered instance: " + addr.getAddress().getHostAddress() + ":" + addr.getPort());
 
-        ipFinder.unregisterAddresses(addresses);
+        ipFinder.unregisterAddresses(addrs);
 
-        assert addresses.size() == ipFinder.getRegisteredAddresses().size();
+        assert addrs.size() == ipFinder.getRegisteredAddresses().size();
 
         ipFinder.registerAddresses(ImmutableList.of(
             new InetSocketAddress("192.168.0.1", TcpDiscoverySpi.DFLT_PORT)));
 
-        assert addresses.size() == ipFinder.getRegisteredAddresses().size();
+        assert addrs.size() == ipFinder.getRegisteredAddresses().size();
     }
 }
diff --git a/modules/flink-ext/pom.xml b/modules/flink-ext/pom.xml
index 72ec87d0..d13b9632 100644
--- a/modules/flink-ext/pom.xml
+++ b/modules/flink-ext/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/flink-ext/src/main/java/org/apache/ignite/source/flink/TaskRemoteFilter.java b/modules/flink-ext/src/main/java/org/apache/ignite/source/flink/TaskRemoteFilter.java
index 4c89d254..c913248d 100644
--- a/modules/flink-ext/src/main/java/org/apache/ignite/source/flink/TaskRemoteFilter.java
+++ b/modules/flink-ext/src/main/java/org/apache/ignite/source/flink/TaskRemoteFilter.java
@@ -51,10 +51,10 @@ public class TaskRemoteFilter implements IgnitePredicate<CacheEvent> {
 
     /** {@inheritDoc} */
     @Override public boolean apply(CacheEvent evt) {
-        Affinity<Object> affinity = ignite.affinity(cacheName);
+        Affinity<Object> aff = ignite.affinity(cacheName);
 
         // Process this event. Ignored on backups.
-        return affinity.isPrimary(ignite.cluster().localNode(), evt.key()) &&
+        return aff.isPrimary(ignite.cluster().localNode(), evt.key()) &&
                 (filter == null || filter.apply(evt));
     }
 }
diff --git a/modules/flume-ext/pom.xml b/modules/flume-ext/pom.xml
index 57aac0ff..7cca47c8 100644
--- a/modules/flume-ext/pom.xml
+++ b/modules/flume-ext/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/flume-ext/src/main/java/org/apache/ignite/stream/flume/IgniteSink.java b/modules/flume-ext/src/main/java/org/apache/ignite/stream/flume/IgniteSink.java
index 54482e52..77b8bfcf 100644
--- a/modules/flume-ext/src/main/java/org/apache/ignite/stream/flume/IgniteSink.java
+++ b/modules/flume-ext/src/main/java/org/apache/ignite/stream/flume/IgniteSink.java
@@ -140,21 +140,21 @@ public class IgniteSink extends AbstractSink implements Configurable {
 
         Transaction transaction = channel.getTransaction();
 
-        int eventCount = 0;
+        int evtCnt = 0;
 
         try {
             transaction.begin();
 
             List<Event> batch = new ArrayList<>(batchSize);
 
-            for (; eventCount < batchSize; ++eventCount) {
-                Event event = channel.take();
+            for (; evtCnt < batchSize; ++evtCnt) {
+                Event evt = channel.take();
 
-                if (event == null) {
+                if (evt == null) {
                     break;
                 }
 
-                batch.add(event);
+                batch.add(evt);
             }
 
             if (!batch.isEmpty()) {
@@ -191,6 +191,6 @@ public class IgniteSink extends AbstractSink implements Configurable {
             transaction.close();
         }
 
-        return eventCount == 0 ? Status.BACKOFF : Status.READY;
+        return evtCnt == 0 ? Status.BACKOFF : Status.READY;
     }
 }
diff --git a/modules/flume-ext/src/test/java/org/apache/ignite/stream/flume/IgniteSinkTest.java b/modules/flume-ext/src/test/java/org/apache/ignite/stream/flume/IgniteSinkTest.java
index fa8645d3..3798829d 100644
--- a/modules/flume-ext/src/test/java/org/apache/ignite/stream/flume/IgniteSinkTest.java
+++ b/modules/flume-ext/src/test/java/org/apache/ignite/stream/flume/IgniteSinkTest.java
@@ -57,14 +57,14 @@ public class IgniteSinkTest extends GridCommonAbstractTest {
 
         final Ignite grid = startGrid("igniteServerNode", cfg);
 
-        Context channelContext = new Context();
+        Context channelCtx = new Context();
 
-        channelContext.put("capacity", String.valueOf(EVENT_CNT));
-        channelContext.put("transactionCapacity", String.valueOf(EVENT_CNT));
+        channelCtx.put("capacity", String.valueOf(EVENT_CNT));
+        channelCtx.put("transactionCapacity", String.valueOf(EVENT_CNT));
 
         Channel memoryChannel = new MemoryChannel();
 
-        Configurables.configure(memoryChannel, channelContext);
+        Configurables.configure(memoryChannel, channelCtx);
 
         final CountDownLatch latch = new CountDownLatch(EVENT_CNT);
 
diff --git a/modules/flume-ext/src/test/java/org/apache/ignite/stream/flume/TestEventTransformer.java b/modules/flume-ext/src/test/java/org/apache/ignite/stream/flume/TestEventTransformer.java
index c15efbf4..e6ee8b3e 100644
--- a/modules/flume-ext/src/test/java/org/apache/ignite/stream/flume/TestEventTransformer.java
+++ b/modules/flume-ext/src/test/java/org/apache/ignite/stream/flume/TestEventTransformer.java
@@ -37,10 +37,10 @@ public class TestEventTransformer implements EventTransformer<Event, String, Int
     private Map<String, Integer> transform(Event event) {
         final Map<String, Integer> map = new HashMap<>();
 
-        String eventStr = new String(event.getBody());
+        String evtStr = new String(event.getBody());
 
-        if (!eventStr.isEmpty()) {
-            String[] tokens = eventStr.split(":"); // Expects column-delimited one line.
+        if (!evtStr.isEmpty()) {
+            String[] tokens = evtStr.split(":"); // Expects column-delimited one line.
 
             map.put(tokens[0].trim(), Integer.valueOf(tokens[1].trim()));
         }
@@ -57,8 +57,8 @@ public class TestEventTransformer implements EventTransformer<Event, String, Int
     @Nullable @Override public Map<String, Integer> transform(List<Event> events) {
         final Map<String, Integer> map = new HashMap<>();
 
-        for (Event event : events) {
-            map.putAll(transform(event));
+        for (Event evt : events) {
+            map.putAll(transform(evt));
         }
 
         return map;
diff --git a/modules/gce-ext/pom.xml b/modules/gce-ext/pom.xml
index a84bc3a0..3f826750 100644
--- a/modules/gce-ext/pom.xml
+++ b/modules/gce-ext/pom.xml
@@ -17,7 +17,9 @@
   limitations under the License.
 -->
 
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/gce-ext/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/gce/TcpDiscoveryGoogleStorageIpFinder.java b/modules/gce-ext/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/gce/TcpDiscoveryGoogleStorageIpFinder.java
index 084783aa..343f43dc 100644
--- a/modules/gce-ext/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/gce/TcpDiscoveryGoogleStorageIpFinder.java
+++ b/modules/gce-ext/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/gce/TcpDiscoveryGoogleStorageIpFinder.java
@@ -126,8 +126,8 @@ public class TcpDiscoveryGoogleStorageIpFinder extends TcpDiscoveryIpFinderAdapt
                 if (objects == null || objects.getItems() == null)
                     break;
 
-                for (StorageObject object : objects.getItems())
-                    addrs.add(addrFromString(object.getName()));
+                for (StorageObject obj : objects.getItems())
+                    addrs.add(addrFromString(obj.getName()));
 
                 listObjects.setPageToken(objects.getNextPageToken());
             }
@@ -149,19 +149,19 @@ public class TcpDiscoveryGoogleStorageIpFinder extends TcpDiscoveryIpFinderAdapt
         for (InetSocketAddress addr : addrs) {
             String key = keyFromAddr(addr);
 
-            StorageObject object = new StorageObject();
+            StorageObject obj = new StorageObject();
 
-            object.setBucket(bucketName);
-            object.setName(key);
+            obj.setBucket(bucketName);
+            obj.setName(key);
 
             InputStreamContent content = new InputStreamContent("application/octet-stream", OBJECT_CONTENT);
 
             content.setLength(OBJECT_CONTENT.available());
 
             try {
-                Storage.Objects.Insert insertObject = storage.objects().insert(bucketName, object, content);
+                Storage.Objects.Insert insertObj = storage.objects().insert(bucketName, obj, content);
 
-                insertObject.execute();
+                insertObj.execute();
             }
             catch (Exception e) {
                 throw new IgniteSpiException("Failed to put entry [bucketName=" + bucketName +
@@ -180,9 +180,9 @@ public class TcpDiscoveryGoogleStorageIpFinder extends TcpDiscoveryIpFinderAdapt
             String key = keyFromAddr(addr);
 
             try {
-                Storage.Objects.Delete deleteObject = storage.objects().delete(bucketName, key);
+                Storage.Objects.Delete deleteObj = storage.objects().delete(bucketName, key);
 
-                deleteObject.execute();
+                deleteObj.execute();
             }
             catch (Exception e) {
                 throw new IgniteSpiException("Failed to delete entry [bucketName=" + bucketName +
diff --git a/modules/geospatial-ext/examples/modules/core/src/test/config/examples.properties b/modules/geospatial-ext/examples/modules/core/src/test/config/examples.properties
index b1b8bc16..fb023d2c 100644
--- a/modules/geospatial-ext/examples/modules/core/src/test/config/examples.properties
+++ b/modules/geospatial-ext/examples/modules/core/src/test/config/examples.properties
@@ -22,4 +22,4 @@ ScalarCacheExample=examples/config/example-ignite.xml
 ScalarCacheQueryExample=examples/config/example-ignite.xml
 ScalarCountGraphTrianglesExample=examples/config/example-ignite.xml
 ScalarPopularNumbersRealTimeExample=examples/config/example-ignite.xml
-DataRegionEexample=examples/config/example-data-regions.xml
\ No newline at end of file
+DataRegionEexample=examples/config/example-data-regions.xml
diff --git a/modules/geospatial-ext/examples/src/main/java/org/apache/ignite/examples/datagrid/SpatialQueryExample.java b/modules/geospatial-ext/examples/src/main/java/org/apache/ignite/examples/datagrid/SpatialQueryExample.java
index 8f7ce094..5a03f3a8 100644
--- a/modules/geospatial-ext/examples/src/main/java/org/apache/ignite/examples/datagrid/SpatialQueryExample.java
+++ b/modules/geospatial-ext/examples/src/main/java/org/apache/ignite/examples/datagrid/SpatialQueryExample.java
@@ -70,7 +70,7 @@ public class SpatialQueryExample {
                 }
 
                 // Query to fetch the points that fit into a specific polygon.
-                SqlQuery<Integer, MapPoint> query = new SqlQuery<>(MapPoint.class, "coords && ?");
+                SqlQuery<Integer, MapPoint> qry = new SqlQuery<>(MapPoint.class, "coords && ?");
 
                 // Selecting points that fit into a specific polygon.
                 for (int i = 0; i < 10; i++) {
@@ -80,7 +80,7 @@ public class SpatialQueryExample {
                         rnd.nextInt(10000) + " 0, 0 0))");
 
                     // Executing the query.
-                    Collection<Cache.Entry<Integer, MapPoint>> entries = cache.query(query.setArgs(cond)).getAll();
+                    Collection<Cache.Entry<Integer, MapPoint>> entries = cache.query(qry.setArgs(cond)).getAll();
 
                     // Printing number of points that fit into the area defined by the polygon.
                     System.out.println("Fetched points [cond=" + cond + ", cnt=" + entries.size() + ']');
diff --git a/modules/geospatial-ext/geospatial/modules/core/src/test/config/examples.properties b/modules/geospatial-ext/geospatial/modules/core/src/test/config/examples.properties
index b1b8bc16..fb023d2c 100644
--- a/modules/geospatial-ext/geospatial/modules/core/src/test/config/examples.properties
+++ b/modules/geospatial-ext/geospatial/modules/core/src/test/config/examples.properties
@@ -22,4 +22,4 @@ ScalarCacheExample=examples/config/example-ignite.xml
 ScalarCacheQueryExample=examples/config/example-ignite.xml
 ScalarCountGraphTrianglesExample=examples/config/example-ignite.xml
 ScalarPopularNumbersRealTimeExample=examples/config/example-ignite.xml
-DataRegionEexample=examples/config/example-data-regions.xml
\ No newline at end of file
+DataRegionEexample=examples/config/example-data-regions.xml
diff --git a/modules/hibernate-ext/examples/modules/core/src/test/config/examples.properties b/modules/hibernate-ext/examples/modules/core/src/test/config/examples.properties
index b1b8bc16..fb023d2c 100644
--- a/modules/hibernate-ext/examples/modules/core/src/test/config/examples.properties
+++ b/modules/hibernate-ext/examples/modules/core/src/test/config/examples.properties
@@ -22,4 +22,4 @@ ScalarCacheExample=examples/config/example-ignite.xml
 ScalarCacheQueryExample=examples/config/example-ignite.xml
 ScalarCountGraphTrianglesExample=examples/config/example-ignite.xml
 ScalarPopularNumbersRealTimeExample=examples/config/example-ignite.xml
-DataRegionEexample=examples/config/example-data-regions.xml
\ No newline at end of file
+DataRegionEexample=examples/config/example-data-regions.xml
diff --git a/modules/hibernate-ext/hibernate/pom.xml b/modules/hibernate-ext/hibernate/pom.xml
index a11399ba..23fa31cd 100644
--- a/modules/hibernate-ext/hibernate/pom.xml
+++ b/modules/hibernate-ext/hibernate/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/hibernate-ext/hibernate/src/test/java/org/apache/ignite/cache/hibernate/HibernateL2CacheConfigurationSelfTest.java b/modules/hibernate-ext/hibernate/src/test/java/org/apache/ignite/cache/hibernate/HibernateL2CacheConfigurationSelfTest.java
index 60eb1315..714c874d 100644
--- a/modules/hibernate-ext/hibernate/src/test/java/org/apache/ignite/cache/hibernate/HibernateL2CacheConfigurationSelfTest.java
+++ b/modules/hibernate-ext/hibernate/src/test/java/org/apache/ignite/cache/hibernate/HibernateL2CacheConfigurationSelfTest.java
@@ -265,10 +265,10 @@ public class HibernateL2CacheConfigurationSelfTest extends GridCommonAbstractTes
     /** */
     private <T> List<T> getResultsList(Session ses, Class<T> entityClass) {
         CriteriaBuilder builder = ses.getCriteriaBuilder();
-        CriteriaQuery<T> query = builder.createQuery(entityClass);
-        Root<T> root = query.from(entityClass);
-        query.select(root);
-        return ses.createQuery(query).getResultList();
+        CriteriaQuery<T> qry = builder.createQuery(entityClass);
+        Root<T> root = qry.from(entityClass);
+        qry.select(root);
+        return ses.createQuery(qry).getResultList();
     }
 
     /**
diff --git a/modules/hibernate-ext/hibernate/src/test/java/org/apache/ignite/cache/hibernate/HibernateL2CacheSelfTest.java b/modules/hibernate-ext/hibernate/src/test/java/org/apache/ignite/cache/hibernate/HibernateL2CacheSelfTest.java
index b2b0752e..9a11117d 100644
--- a/modules/hibernate-ext/hibernate/src/test/java/org/apache/ignite/cache/hibernate/HibernateL2CacheSelfTest.java
+++ b/modules/hibernate-ext/hibernate/src/test/java/org/apache/ignite/cache/hibernate/HibernateL2CacheSelfTest.java
@@ -1921,8 +1921,8 @@ public class HibernateL2CacheSelfTest extends GridCommonAbstractTest {
 
         MetadataSources metadataSources = new MetadataSources(srvcRegistry);
 
-        for (Class entityClass : getAnnotatedClasses())
-            metadataSources.addAnnotatedClass(entityClass);
+        for (Class entityCls : getAnnotatedClasses())
+            metadataSources.addAnnotatedClass(entityCls);
 
         Metadata metadata = metadataSources.buildMetadata();
 
diff --git a/modules/jms11-ext/pom.xml b/modules/jms11-ext/pom.xml
index 46c2f0af..31adb0cb 100644
--- a/modules/jms11-ext/pom.xml
+++ b/modules/jms11-ext/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/jms11-ext/src/main/java/org/apache/ignite/stream/jms11/JmsStreamer.java b/modules/jms11-ext/src/main/java/org/apache/ignite/stream/jms11/JmsStreamer.java
index 8343363a..b9e09871 100644
--- a/modules/jms11-ext/src/main/java/org/apache/ignite/stream/jms11/JmsStreamer.java
+++ b/modules/jms11-ext/src/main/java/org/apache/ignite/stream/jms11/JmsStreamer.java
@@ -240,17 +240,17 @@ public class JmsStreamer<T extends Message, K, V> extends StreamAdapter<T, K, V>
                 scheduler = Executors.newScheduledThreadPool(1);
                 scheduler.schedule(new Runnable() {
                     @Override public void run() {
-                        for (Session session : sessions) {
+                        for (Session ses : sessions) {
                             try {
-                                session.commit();
+                                ses.commit();
                                 if (log.isDebugEnabled()) {
-                                    log.debug("Committing session from time-based batch completion [session=" +
-                                        session + "]");
+                                    log.debug("Committing session from time-based batch completion [ses=" +
+                                        ses + "]");
                                 }
                             }
                             catch (JMSException ignored) {
                                 log.warning("Error while committing session: from batch time-based completion " +
-                                    "[session=" + session + "]");
+                                    "[ses=" + ses + "]");
                             }
                         }
                         for (IgniteJmsMessageListener ml : listeners) {
@@ -440,39 +440,39 @@ public class JmsStreamer<T extends Message, K, V> extends StreamAdapter<T, K, V>
 
     /** */
     private void initializeJmsObjectsForTopic() throws JMSException {
-        Session session = connection.createSession(transacted, Session.AUTO_ACKNOWLEDGE);
+        Session ses = connection.createSession(transacted, Session.AUTO_ACKNOWLEDGE);
         Topic topic = (Topic)destination;
 
         if (destination == null)
-            topic = session.createTopic(destinationName);
+            topic = ses.createTopic(destinationName);
 
-        MessageConsumer consumer = durableSubscription ? session.createDurableSubscriber(topic, durableSubscriptionName) :
-            session.createConsumer(topic);
+        MessageConsumer consumer = durableSubscription ? ses.createDurableSubscriber(topic, durableSubscriptionName) :
+            ses.createConsumer(topic);
 
-        IgniteJmsMessageListener messageListener = new IgniteJmsMessageListener(session, true);
-        consumer.setMessageListener(messageListener);
+        IgniteJmsMessageListener msgListener = new IgniteJmsMessageListener(ses, true);
+        consumer.setMessageListener(msgListener);
 
         consumers.add(consumer);
-        sessions.add(session);
-        listeners.add(messageListener);
+        sessions.add(ses);
+        listeners.add(msgListener);
     }
 
     /** */
     private void initializeJmsObjectsForQueue() throws JMSException {
         for (int i = 0; i < threads; i++) {
-            Session session = connection.createSession(transacted, Session.AUTO_ACKNOWLEDGE);
+            Session ses = connection.createSession(transacted, Session.AUTO_ACKNOWLEDGE);
 
             if (destination == null)
-                destination = session.createQueue(destinationName);
+                destination = ses.createQueue(destinationName);
 
-            MessageConsumer consumer = session.createConsumer(destination);
+            MessageConsumer consumer = ses.createConsumer(destination);
 
-            IgniteJmsMessageListener messageListener = new IgniteJmsMessageListener(session, false);
-            consumer.setMessageListener(messageListener);
+            IgniteJmsMessageListener msgListener = new IgniteJmsMessageListener(ses, false);
+            consumer.setMessageListener(msgListener);
 
             consumers.add(consumer);
-            sessions.add(session);
-            listeners.add(messageListener);
+            sessions.add(ses);
+            listeners.add(msgListener);
         }
     }
 
diff --git a/modules/jms11-ext/src/test/java/org/apache/ignite/stream/jms11/IgniteJmsStreamerTest.java b/modules/jms11-ext/src/test/java/org/apache/ignite/stream/jms11/IgniteJmsStreamerTest.java
index 71b9fde6..e720ef78 100644
--- a/modules/jms11-ext/src/test/java/org/apache/ignite/stream/jms11/IgniteJmsStreamerTest.java
+++ b/modules/jms11-ext/src/test/java/org/apache/ignite/stream/jms11/IgniteJmsStreamerTest.java
@@ -641,22 +641,22 @@ public class IgniteJmsStreamerTest extends GridCommonAbstractTest {
             set.add(to);
         }
 
-        int messagesSent;
+        int msgsSent;
 
         if (singleMsg) {
             mp.send(ses.createObjectMessage(set));
-            messagesSent = 1;
+            msgsSent = 1;
         }
         else {
             for (TestTransformers.TestObject to : set)
                 mp.send(ses.createObjectMessage(to));
 
-            messagesSent = set.size();
+            msgsSent = set.size();
         }
 
         if (dest instanceof Queue) {
             try {
-                assertEquals(messagesSent, broker.getBroker().getDestinationMap().get(dest)
+                assertEquals(msgsSent, broker.getBroker().getDestinationMap().get(dest)
                     .getDestinationStatistics().getMessages().getCount());
             }
             catch (Exception e) {
@@ -677,7 +677,7 @@ public class IgniteJmsStreamerTest extends GridCommonAbstractTest {
         for (String key : TEST_DATA.keySet())
             set.add(key + "," + TEST_DATA.get(key));
 
-        int messagesSent;
+        int msgsSent;
 
         if (singleMsg) {
             StringBuilder sb = new StringBuilder();
@@ -687,19 +687,19 @@ public class IgniteJmsStreamerTest extends GridCommonAbstractTest {
 
             sb.deleteCharAt(sb.length() - 1);
             mp.send(ses.createTextMessage(sb.toString()));
-            messagesSent = 1;
+            msgsSent = 1;
 
         }
         else {
             for (String s : set)
                 mp.send(ses.createTextMessage(s));
 
-            messagesSent = set.size();
+            msgsSent = set.size();
         }
 
         if (dest instanceof Queue) {
             try {
-                assertEquals(messagesSent, broker.getBroker().getDestinationMap().get(dest)
+                assertEquals(msgsSent, broker.getBroker().getDestinationMap().get(dest)
                     .getDestinationStatistics().getMessages().getCount());
             }
             catch (Exception e) {
diff --git a/modules/jms11-ext/src/test/java/org/apache/ignite/stream/jms11/TestTransformers.java b/modules/jms11-ext/src/test/java/org/apache/ignite/stream/jms11/TestTransformers.java
index 9f1e08a0..4bf8c4eb 100644
--- a/modules/jms11-ext/src/test/java/org/apache/ignite/stream/jms11/TestTransformers.java
+++ b/modules/jms11-ext/src/test/java/org/apache/ignite/stream/jms11/TestTransformers.java
@@ -69,9 +69,9 @@ public class TestTransformers {
         return new MessageTransformer<ObjectMessage, String, String>() {
             @SuppressWarnings("unchecked")
             @Override public Map<String, String> apply(ObjectMessage message) {
-                Object object;
+                Object obj;
                 try {
-                    object = message.getObject();
+                    obj = message.getObject();
                 }
                 catch (JMSException e) {
                     e.printStackTrace();
@@ -79,13 +79,13 @@ public class TestTransformers {
                 }
 
                 final Map<String, String> answer = new HashMap<>();
-                if (object instanceof Collection) {
-                    for (TestObject to : (Collection<TestObject>)object)
+                if (obj instanceof Collection) {
+                    for (TestObject to : (Collection<TestObject>)obj)
                         answer.put(to.getKey(), to.getValue());
 
                 }
-                else if (object instanceof TestObject) {
-                    TestObject to = (TestObject)object;
+                else if (obj instanceof TestObject) {
+                    TestObject to = (TestObject)obj;
                     answer.put(to.getKey(), to.getValue());
                 }
                 return answer;
diff --git a/modules/kafka-ext/src/main/java/org/apache/ignite/stream/kafka/connect/IgniteSourceTask.java b/modules/kafka-ext/src/main/java/org/apache/ignite/stream/kafka/connect/IgniteSourceTask.java
index 6e3d43ba..a46a58ff 100644
--- a/modules/kafka-ext/src/main/java/org/apache/ignite/stream/kafka/connect/IgniteSourceTask.java
+++ b/modules/kafka-ext/src/main/java/org/apache/ignite/stream/kafka/connect/IgniteSourceTask.java
@@ -277,9 +277,9 @@ public class IgniteSourceTask extends SourceTask {
 
         /** {@inheritDoc} */
         @Override public boolean apply(CacheEvent evt) {
-            Affinity<Object> affinity = ignite.affinity(cacheName);
+            Affinity<Object> aff = ignite.affinity(cacheName);
 
-            if (affinity.isPrimary(ignite.cluster().localNode(), evt.key())) {
+            if (aff.isPrimary(ignite.cluster().localNode(), evt.key())) {
                 // Process this event. Ignored on backups.
                 if (filter != null && filter.apply(evt))
                     return false;
diff --git a/modules/kafka-ext/src/test/java/org/apache/ignite/stream/kafka/KafkaIgniteStreamerSelfTest.java b/modules/kafka-ext/src/test/java/org/apache/ignite/stream/kafka/KafkaIgniteStreamerSelfTest.java
index ef4256e8..d6a71353 100644
--- a/modules/kafka-ext/src/test/java/org/apache/ignite/stream/kafka/KafkaIgniteStreamerSelfTest.java
+++ b/modules/kafka-ext/src/test/java/org/apache/ignite/stream/kafka/KafkaIgniteStreamerSelfTest.java
@@ -130,7 +130,7 @@ public class KafkaIgniteStreamerSelfTest extends GridCommonAbstractTest {
 
         Collections.shuffle(subnet);
 
-        List<ProducerRecord<String, String>> messages = new ArrayList<>(CNT);
+        List<ProducerRecord<String, String>> msgs = new ArrayList<>(CNT);
 
         Map<String, String> keyValMap = new HashMap<>();
 
@@ -141,12 +141,12 @@ public class KafkaIgniteStreamerSelfTest extends GridCommonAbstractTest {
 
             String msg = runtime + VALUE_URL + ip;
 
-            messages.add(new ProducerRecord<>(topic, ip, msg));
+            msgs.add(new ProducerRecord<>(topic, ip, msg));
 
             keyValMap.put(ip, msg);
         }
 
-        embeddedBroker.sendMessages(messages);
+        embeddedBroker.sendMessages(msgs);
 
         return keyValMap;
     }
diff --git a/modules/kafka-ext/src/test/java/org/apache/ignite/stream/kafka/connect/IgniteSinkConnectorTest.java b/modules/kafka-ext/src/test/java/org/apache/ignite/stream/kafka/connect/IgniteSinkConnectorTest.java
index 430da505..69231960 100644
--- a/modules/kafka-ext/src/test/java/org/apache/ignite/stream/kafka/connect/IgniteSinkConnectorTest.java
+++ b/modules/kafka-ext/src/test/java/org/apache/ignite/stream/kafka/connect/IgniteSinkConnectorTest.java
@@ -226,7 +226,7 @@ public class IgniteSinkConnectorTest extends GridCommonAbstractTest {
      * @return Map of key value messages.
      */
     private Map<String, String> produceStream(String topic, boolean keyless) {
-        List<ProducerRecord<String, String>> messages = new ArrayList<>(EVENT_CNT);
+        List<ProducerRecord<String, String>> msgs = new ArrayList<>(EVENT_CNT);
 
         Map<String, String> keyValMap = new HashMap<>();
 
@@ -239,7 +239,7 @@ public class IgniteSinkConnectorTest extends GridCommonAbstractTest {
 
             String msg = topic + ":" + String.valueOf(evt) + "_" + runtime;
 
-            messages.add(new ProducerRecord<>(topic, key, msg));
+            msgs.add(new ProducerRecord<>(topic, key, msg));
 
             if (!keyless)
                 keyValMap.put(key, msg);
@@ -247,7 +247,7 @@ public class IgniteSinkConnectorTest extends GridCommonAbstractTest {
                 keyValMap.put(topic + ":" + String.valueOf(evt), String.valueOf(runtime));
         }
 
-        kafkaBroker.sendMessages(messages);
+        kafkaBroker.sendMessages(msgs);
 
         return keyValMap;
     }
diff --git a/modules/kafka-ext/src/test/java/org/apache/ignite/stream/kafka/connect/IgniteSourceConnectorTest.java b/modules/kafka-ext/src/test/java/org/apache/ignite/stream/kafka/connect/IgniteSourceConnectorTest.java
index afd9e348..858c369a 100644
--- a/modules/kafka-ext/src/test/java/org/apache/ignite/stream/kafka/connect/IgniteSourceConnectorTest.java
+++ b/modules/kafka-ext/src/test/java/org/apache/ignite/stream/kafka/connect/IgniteSourceConnectorTest.java
@@ -338,7 +338,7 @@ public class IgniteSourceConnectorTest extends GridCommonAbstractTest {
      * @return Worker configurations.
      * @throws IOException If failed.
      */
-    private Map<String, String> makeWorkerProps(){
+    private Map<String, String> makeWorkerProps() {
         Map<String, String> props = new HashMap<>();
 
         props.put("internal.key.converter.schemas.enable", "false");
diff --git a/modules/mesos-ext/pom.xml b/modules/mesos-ext/pom.xml
index 5b996975..cad52c74 100644
--- a/modules/mesos-ext/pom.xml
+++ b/modules/mesos-ext/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/mesos-ext/src/main/java/org/apache/ignite/mesos/IgniteScheduler.java b/modules/mesos-ext/src/main/java/org/apache/ignite/mesos/IgniteScheduler.java
index 3a58f652..c65309d7 100644
--- a/modules/mesos-ext/src/main/java/org/apache/ignite/mesos/IgniteScheduler.java
+++ b/modules/mesos-ext/src/main/java/org/apache/ignite/mesos/IgniteScheduler.java
@@ -240,24 +240,24 @@ public class IgniteScheduler implements Scheduler {
             return null;
 
         // Collect resource on slave.
-        for (Protos.Resource resource : offer.getResourcesList()) {
-            if (resource.getName().equals(CPU)) {
-                if (resource.getType().equals(Protos.Value.Type.SCALAR))
-                    cpus = resource.getScalar().getValue();
+        for (Protos.Resource rsrc : offer.getResourcesList()) {
+            if (rsrc.getName().equals(CPU)) {
+                if (rsrc.getType().equals(Protos.Value.Type.SCALAR))
+                    cpus = rsrc.getScalar().getValue();
                 else
-                    log.log(Level.FINE, "Cpus resource was not a scalar: {0}" + resource.getType());
+                    log.log(Level.FINE, "Cpus resource was not a scalar: {0}" + rsrc.getType());
             }
-            else if (resource.getName().equals(MEM)) {
-                if (resource.getType().equals(Protos.Value.Type.SCALAR))
-                    mem = resource.getScalar().getValue();
+            else if (rsrc.getName().equals(MEM)) {
+                if (rsrc.getType().equals(Protos.Value.Type.SCALAR))
+                    mem = rsrc.getScalar().getValue();
                 else
-                    log.log(Level.FINE, "Mem resource was not a scalar: {0}", resource.getType());
+                    log.log(Level.FINE, "Mem resource was not a scalar: {0}", rsrc.getType());
             }
-            else if (resource.getName().equals(DISK))
-                if (resource.getType().equals(Protos.Value.Type.SCALAR))
-                    disk = resource.getScalar().getValue();
+            else if (rsrc.getName().equals(DISK))
+                if (rsrc.getType().equals(Protos.Value.Type.SCALAR))
+                    disk = rsrc.getScalar().getValue();
                 else
-                    log.log(Level.FINE, "Disk resource was not a scalar: {0}", resource.getType());
+                    log.log(Level.FINE, "Disk resource was not a scalar: {0}", rsrc.getType());
         }
 
         // Check that slave satisfies min requirements.
@@ -315,7 +315,7 @@ public class IgniteScheduler implements Scheduler {
             if (failedTask != null) {
                 List<Protos.Request> requests = new ArrayList<>();
 
-                Protos.Request request = Protos.Request.newBuilder()
+                Protos.Request req = Protos.Request.newBuilder()
                     .addResources(Protos.Resource.newBuilder()
                         .setType(Protos.Value.Type.SCALAR)
                         .setName(MEM)
@@ -326,7 +326,7 @@ public class IgniteScheduler implements Scheduler {
                         .setScalar(Protos.Value.Scalar.newBuilder().setValue(failedTask.cpuCores())))
                     .build();
 
-                requests.add(request);
+                requests.add(req);
 
                 schedulerDriver.requestResources(requests);
             }
diff --git a/modules/mesos-ext/src/main/java/org/apache/ignite/mesos/resource/IgniteProvider.java b/modules/mesos-ext/src/main/java/org/apache/ignite/mesos/resource/IgniteProvider.java
index bd6d471a..4d3f0865 100644
--- a/modules/mesos-ext/src/main/java/org/apache/ignite/mesos/resource/IgniteProvider.java
+++ b/modules/mesos-ext/src/main/java/org/apache/ignite/mesos/resource/IgniteProvider.java
@@ -119,13 +119,13 @@ public class IgniteProvider {
      * @throws IOException If failed.
      */
     private String findMirror() throws IOException {
-        String response = getHttpContents(new URL(APACHE_MIRROR_URL));
+        String res = getHttpContents(new URL(APACHE_MIRROR_URL));
 
-        if (response == null)
+        if (res == null)
             throw new RuntimeException("Failed to retrieve mirrors");
 
         ObjectMapper mapper = new ObjectMapper();
-        JsonNode mirrorUrl = mapper.readTree(response).get("preferred");
+        JsonNode mirrorUrl = mapper.readTree(res).get("preferred");
 
         if (mirrorUrl == null)
             throw new RuntimeException("Failed to find the preferred mirror");
@@ -140,12 +140,12 @@ public class IgniteProvider {
      * @throws IOException If failed.
      */
     private String findLatestVersion() throws IOException {
-        String response = getHttpContents(new URL(IGNITE_LATEST_VERSION_URL));
+        String res = getHttpContents(new URL(IGNITE_LATEST_VERSION_URL));
 
-        if (response == null)
+        if (res == null)
             throw new RuntimeException("Failed to identify the latest version. Specify it with " + IGNITE_VERSION);
 
-        Matcher m = VERSION_PATTERN.matcher(response);
+        Matcher m = VERSION_PATTERN.matcher(res);
         if (m.find())
             return m.group();
         else
diff --git a/modules/mesos-ext/src/main/java/org/apache/ignite/mesos/resource/ResourceHandler.java b/modules/mesos-ext/src/main/java/org/apache/ignite/mesos/resource/ResourceHandler.java
index 51de26b9..8dd31944 100644
--- a/modules/mesos-ext/src/main/java/org/apache/ignite/mesos/resource/ResourceHandler.java
+++ b/modules/mesos-ext/src/main/java/org/apache/ignite/mesos/resource/ResourceHandler.java
@@ -79,9 +79,9 @@ public class ResourceHandler extends AbstractHandler {
 
         String fileName = path[path.length - 1];
 
-        String servicePath = url.substring(0, url.length() - fileName.length());
+        String srvcPath = url.substring(0, url.length() - fileName.length());
 
-        switch (servicePath) {
+        switch (srvcPath) {
             case IGNITE_PREFIX:
                 handleRequest(response, "application/zip-archive", igniteDir + "/" + fileName);
 
diff --git a/modules/mesos-ext/src/test/java/org/apache/ignite/mesos/IgniteSchedulerSelfTest.java b/modules/mesos-ext/src/test/java/org/apache/ignite/mesos/IgniteSchedulerSelfTest.java
index b362beed..175a7cea 100644
--- a/modules/mesos-ext/src/test/java/org/apache/ignite/mesos/IgniteSchedulerSelfTest.java
+++ b/modules/mesos-ext/src/test/java/org/apache/ignite/mesos/IgniteSchedulerSelfTest.java
@@ -320,26 +320,26 @@ public class IgniteSchedulerSelfTest {
      */
     @Test
     public void testIgniteFramework() throws Exception {
-        final String mesosUserValue = "userAAAAA";
-        final String mesosRoleValue = "role1";
+        final String mesosUserVal = "userAAAAA";
+        final String mesosRoleVal = "role1";
 
         IgniteFramework igniteFramework = new IgniteFramework() {
             @Override protected String getUser() {
-                return mesosUserValue;
+                return mesosUserVal;
             }
 
             @Override protected String getRole() {
-                return mesosRoleValue;
+                return mesosRoleVal;
             }
         };
 
         Protos.FrameworkInfo info = igniteFramework.getFrameworkInfo();
 
-        String actualUserValue = info.getUser();
-        String actualRoleValue = info.getRole();
+        String actualUserVal = info.getUser();
+        String actualRoleVal = info.getRole();
 
-        assertEquals(actualUserValue, mesosUserValue);
-        assertEquals(actualRoleValue, mesosRoleValue);
+        assertEquals(actualUserVal, mesosUserVal);
+        assertEquals(actualRoleVal, mesosRoleVal);
     }
 
     /**
@@ -350,8 +350,8 @@ public class IgniteSchedulerSelfTest {
         List<String> failedRoleValues = Arrays.asList("", ".", "..", "-testRole",
             "test/Role", "test\\Role", "test Role", null);
 
-        for (String failedRoleValue : failedRoleValues)
-            assertFalse(IgniteFramework.isRoleValid(failedRoleValue));
+        for (String failedRoleVal : failedRoleValues)
+            assertFalse(IgniteFramework.isRoleValid(failedRoleVal));
     }
 
     /**
@@ -359,9 +359,9 @@ public class IgniteSchedulerSelfTest {
      * @return Value.
      */
     private Double resources(List<Protos.Resource> resources, String resourceType) {
-        for (Protos.Resource resource : resources) {
-            if (resource.getName().equals(resourceType))
-                return resource.getScalar().getValue();
+        for (Protos.Resource rsrc : resources) {
+            if (rsrc.getName().equals(resourceType))
+                return rsrc.getScalar().getValue();
         }
 
         return null;
diff --git a/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/inference/catboost/CatboostClassificationModelParserExample.java b/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/inference/catboost/CatboostClassificationModelParserExample.java
index 4bd46dbd..493a91da 100644
--- a/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/inference/catboost/CatboostClassificationModelParserExample.java
+++ b/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/inference/catboost/CatboostClassificationModelParserExample.java
@@ -86,8 +86,8 @@ public class CatboostClassificationModelParserExample {
             try (Model<NamedVector, Future<Double>> mdl = mdlBuilder.build(reader, parser);
                  Scanner testDataScanner = new Scanner(testData);
                  Scanner testExpResultsScanner = new Scanner(testExpRes)) {
-                String header = testDataScanner.nextLine();
-                String[] columns = header.split(",");
+                String hdr = testDataScanner.nextLine();
+                String[] columns = hdr.split(",");
 
                 while (testDataScanner.hasNextLine()) {
                     String testDataStr = testDataScanner.nextLine();
diff --git a/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/inference/h2o/H2OMojoModelParserExample.java b/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/inference/h2o/H2OMojoModelParserExample.java
index 613c1e43..f0631ddf 100644
--- a/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/inference/h2o/H2OMojoModelParserExample.java
+++ b/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/inference/h2o/H2OMojoModelParserExample.java
@@ -81,13 +81,13 @@ public class H2OMojoModelParserExample {
 
                     HashMap<String, Double> testObj = new HashMap<>();
 
-                    for (String keyValueString : testDataStr.split(" ")) {
-                        String[] keyVal = keyValueString.split(":");
+                    for (String keyValStr : testDataStr.split(" ")) {
+                        String[] keyVal = keyValStr.split(":");
 
                         if (keyVal.length == 2)
                             testObj.put("C" + (1 + Integer.parseInt(keyVal[0])), Double.parseDouble(keyVal[1]));
                         else
-                            actual = keyValueString;
+                            actual = keyValStr;
                     }
 
                     double prediction = mdl.predict(VectorUtils.of(testObj)).get();
diff --git a/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/inference/xgboost/XGBoostModelParserExample.java b/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/inference/xgboost/XGBoostModelParserExample.java
index 28974bb8..9c695849 100644
--- a/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/inference/xgboost/XGBoostModelParserExample.java
+++ b/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/inference/xgboost/XGBoostModelParserExample.java
@@ -91,8 +91,8 @@ public class XGBoostModelParserExample {
 
                     HashMap<String, Double> testObj = new HashMap<>();
 
-                    for (String keyValueString : testDataStr.split(" ")) {
-                        String[] keyVal = keyValueString.split(":");
+                    for (String keyValStr : testDataStr.split(" ")) {
+                        String[] keyVal = keyValStr.split(":");
 
                         if (keyVal.length == 2)
                             testObj.put("f" + keyVal[0], Double.parseDouble(keyVal[1]));
diff --git a/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/preprocessing/encoding/TargetEncoderExample.java b/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/preprocessing/encoding/TargetEncoderExample.java
index 9768c8b7..73864ba9 100644
--- a/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/preprocessing/encoding/TargetEncoderExample.java
+++ b/modules/ml-ext/examples/src/main/java/org/apache/ignite/examples/ml/preprocessing/encoding/TargetEncoderExample.java
@@ -70,10 +70,10 @@ public class TargetEncoderExample {
 
                 Set<Integer> featuresIndexies = new HashSet<>(Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9));
                 Set<Integer> targetEncodedfeaturesIndexies = new HashSet<>(Arrays.asList(1, 5, 6));
-                Integer targetIndex = 0;
+                Integer targetIdx = 0;
 
                 final Vectorizer<Integer, Object[], Integer, Object> vectorizer =
-                    new ObjectArrayVectorizer<Integer>(featuresIndexies.toArray(new Integer[0])).labeled(targetIndex);
+                    new ObjectArrayVectorizer<Integer>(featuresIndexies.toArray(new Integer[0])).labeled(targetIdx);
 
                 Preprocessor<Integer, Object[]> strEncoderPreprocessor = new EncoderTrainer<Integer, Object[]>()
                     .withEncoderType(EncoderType.STRING_ENCODER)
@@ -84,7 +84,7 @@ public class TargetEncoderExample {
                         vectorizer
                     );
 
-                Preprocessor<Integer, Object[]> targetEncoderProcessor = new EncoderTrainer<Integer, Object[]>()
+                Preprocessor<Integer, Object[]> targetEncoderProc = new EncoderTrainer<Integer, Object[]>()
                     .withEncoderType(EncoderType.TARGET_ENCODER)
                     .labeled(0)
                     .withEncodedFeatures(targetEncodedfeaturesIndexies)
@@ -100,7 +100,7 @@ public class TargetEncoderExample {
                     .withEncoderType(EncoderType.LABEL_ENCODER)
                     .fit(ignite,
                         dataCache,
-                        targetEncoderProcessor
+                        targetEncoderProc
                     );
 
                 GDBTrainer trainer = new GDBBinaryClassifierOnTreesTrainer(0.5, 500, 4, 0.)
diff --git a/modules/ml-ext/examples/src/test/java/org/apache/ignite/testsuites/IgniteExamplesMLTestSuite.java b/modules/ml-ext/examples/src/test/java/org/apache/ignite/testsuites/IgniteExamplesMLTestSuite.java
index 5b04a1a6..a32903e1 100644
--- a/modules/ml-ext/examples/src/test/java/org/apache/ignite/testsuites/IgniteExamplesMLTestSuite.java
+++ b/modules/ml-ext/examples/src/test/java/org/apache/ignite/testsuites/IgniteExamplesMLTestSuite.java
@@ -137,8 +137,8 @@ public class IgniteExamplesMLTestSuite {
             dirs.add(new File(resources.nextElement().getFile()));
 
         List<Class> classes = new ArrayList<>();
-        for (File directory : dirs)
-            classes.addAll(findClasses(directory, pkgName, clsNamePtrn));
+        for (File dir : dirs)
+            classes.addAll(findClasses(dir, pkgName, clsNamePtrn));
 
         return classes;
     }
diff --git a/modules/ml-ext/ml/catboost-model-parser/src/main/java/org/apache/ignite/ml/catboost/CatboostClassificationModel.java b/modules/ml-ext/ml/catboost-model-parser/src/main/java/org/apache/ignite/ml/catboost/CatboostClassificationModel.java
index 214d3710..9f9400d8 100644
--- a/modules/ml-ext/ml/catboost-model-parser/src/main/java/org/apache/ignite/ml/catboost/CatboostClassificationModel.java
+++ b/modules/ml-ext/ml/catboost-model-parser/src/main/java/org/apache/ignite/ml/catboost/CatboostClassificationModel.java
@@ -46,16 +46,21 @@ public class CatboostClassificationModel implements Model<NamedVector, Double> {
     /** {@inheritDoc} */
     @Override public Double predict(NamedVector input) {
         float[] floatInput = new float[input.size()];
-        int index = 0;
+        int idx = 0;
         for (String key : model.getFeatureNames()) {
-            floatInput[index] = (float)input.get(key);
-            index++;
+            floatInput[idx] = (float)input.get(key);
+            idx++;
         }
 
         try {
             double predict = model.predict(floatInput, model.getFeatureNames())
                 .get(0, 0);
-            // use formula based on https://github.com/catboost/benchmarks/blob/61d62512f751325a14dd885bb71f8c2dabf7e24b/quality_benchmarks/catboost_experiment.py#L77
+
+            /***
+             * use formula based on
+             * https://github.com/
+             * catboost/benchmarks/blob/61d62512f751325a14dd885bb71f8c2dabf7e24b/quality_benchmarks/catboost_experiment.py#L77
+             */
             return Math.pow(1 + Math.exp(-predict), -1);
         }
         catch (CatBoostError e) {
diff --git a/modules/ml-ext/ml/catboost-model-parser/src/main/java/org/apache/ignite/ml/catboost/CatboostRegressionModel.java b/modules/ml-ext/ml/catboost-model-parser/src/main/java/org/apache/ignite/ml/catboost/CatboostRegressionModel.java
index aec99263..d3d65deb 100644
--- a/modules/ml-ext/ml/catboost-model-parser/src/main/java/org/apache/ignite/ml/catboost/CatboostRegressionModel.java
+++ b/modules/ml-ext/ml/catboost-model-parser/src/main/java/org/apache/ignite/ml/catboost/CatboostRegressionModel.java
@@ -46,10 +46,10 @@ public class CatboostRegressionModel implements Model<NamedVector, Double> {
     /** {@inheritDoc} */
     @Override public Double predict(NamedVector input) {
         float[] floatInput = new float[input.size()];
-        int index = 0;
+        int idx = 0;
         for (String key: model.getFeatureNames()) {
-            floatInput[index] = (float)input.get(key);
-            index++;
+            floatInput[idx] = (float)input.get(key);
+            idx++;
         }
 
         try {
diff --git a/modules/ml-ext/ml/spark-model-parser/src/main/java/org/apache/ignite/ml/sparkmodelparser/SparkModelParser.java b/modules/ml-ext/ml/spark-model-parser/src/main/java/org/apache/ignite/ml/sparkmodelparser/SparkModelParser.java
index 203cfd53..9eda0532 100644
--- a/modules/ml-ext/ml/spark-model-parser/src/main/java/org/apache/ignite/ml/sparkmodelparser/SparkModelParser.java
+++ b/modules/ml-ext/ml/spark-model-parser/src/main/java/org/apache/ignite/ml/sparkmodelparser/SparkModelParser.java
@@ -481,8 +481,8 @@ public class SparkModelParser {
                     final SimpleGroup g = (SimpleGroup)recordReader.read();
                     final int treeID = g.getInteger(0, 0);
 
-                    final SimpleGroup nodeDataGroup = (SimpleGroup)g.getGroup(1, 0);
-                    NodeData nodeData = extractNodeDataFromParquetRow(nodeDataGroup);
+                    final SimpleGroup nodeDataGrp = (SimpleGroup)g.getGroup(1, 0);
+                    NodeData nodeData = extractNodeDataFromParquetRow(nodeDataGrp);
 
                     if (nodesByTreeId.containsKey(treeID)) {
                         Map<Integer, NodeData> nodesByNodeId = nodesByTreeId.get(treeID);
@@ -545,9 +545,9 @@ public class SparkModelParser {
                 for (int i = 0; i < rows; i++) {
                     final SimpleGroup g = (SimpleGroup)recordReader.read();
                     final int treeID = g.getInteger(0, 0);
-                    final SimpleGroup nodeDataGroup = (SimpleGroup)g.getGroup(1, 0);
+                    final SimpleGroup nodeDataGrp = (SimpleGroup)g.getGroup(1, 0);
 
-                    NodeData nodeData = extractNodeDataFromParquetRow(nodeDataGroup);
+                    NodeData nodeData = extractNodeDataFromParquetRow(nodeDataGrp);
 
                     if (nodesByTreeId.containsKey(treeID)) {
                         Map<Integer, NodeData> nodesByNodeId = nodesByTreeId.get(treeID);
@@ -783,14 +783,14 @@ public class SparkModelParser {
      */
     private static Vector readSVMCoefficients(SimpleGroup g) {
         Vector coefficients;
-        Group coeffGroup = g.getGroup(0, 0).getGroup(3, 0);
+        Group coeffGrp = g.getGroup(0, 0).getGroup(3, 0);
 
-        final int amountOfCoefficients = coeffGroup.getFieldRepetitionCount(0);
+        final int amountOfCoefficients = coeffGrp.getFieldRepetitionCount(0);
 
         coefficients = new DenseVector(amountOfCoefficients);
 
         for (int j = 0; j < amountOfCoefficients; j++) {
-            double coefficient = coeffGroup.getGroup(0, j).getDouble(0, 0);
+            double coefficient = coeffGrp.getGroup(0, j).getDouble(0, 0);
             coefficients.set(j, coefficient);
         }
         return coefficients;
@@ -813,14 +813,14 @@ public class SparkModelParser {
      */
     private static Vector readLinRegCoefficients(SimpleGroup g) {
         Vector coefficients;
-        Group coeffGroup = g.getGroup(1, 0).getGroup(3, 0);
+        Group coeffGrp = g.getGroup(1, 0).getGroup(3, 0);
 
-        final int amountOfCoefficients = coeffGroup.getFieldRepetitionCount(0);
+        final int amountOfCoefficients = coeffGrp.getFieldRepetitionCount(0);
 
         coefficients = new DenseVector(amountOfCoefficients);
 
         for (int j = 0; j < amountOfCoefficients; j++) {
-            double coefficient = coeffGroup.getGroup(0, j).getDouble(0, 0);
+            double coefficient = coeffGrp.getGroup(0, j).getDouble(0, 0);
             coefficients.set(j, coefficient);
         }
         return coefficients;
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/clustering/gmm/GmmPartitionData.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/clustering/gmm/GmmPartitionData.java
index 29fa1ffa..87bca589 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/clustering/gmm/GmmPartitionData.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/clustering/gmm/GmmPartitionData.java
@@ -139,9 +139,9 @@ class GmmPartitionData implements AutoCloseable {
         @Override public GmmPartitionData build(LearningEnvironment env, Iterator<UpstreamEntry<K, V>> upstreamData,
             long upstreamDataSize, EmptyContext ctx) {
 
-            int rowsCount = Math.toIntExact(upstreamDataSize);
-            List<LabeledVector<Double>> xs = new ArrayList<>(rowsCount);
-            double[][] pcxi = new double[rowsCount][countOfComponents];
+            int rowsCnt = Math.toIntExact(upstreamDataSize);
+            List<LabeledVector<Double>> xs = new ArrayList<>(rowsCnt);
+            double[][] pcxi = new double[rowsCnt][countOfComponents];
 
             while (upstreamData.hasNext()) {
                 UpstreamEntry<K, V> entry = upstreamData.next();
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/clustering/gmm/GmmTrainer.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/clustering/gmm/GmmTrainer.java
index 3e47b81d..39dfcf6a 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/clustering/gmm/GmmTrainer.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/clustering/gmm/GmmTrainer.java
@@ -261,19 +261,19 @@ public class GmmTrainer extends SingleLabelDatasetTrainer<GmmModel> {
      */
     private Optional<GmmModel> fit(Dataset<EmptyContext, GmmPartitionData> dataset) {
         return init(dataset).map(model -> {
-            GmmModel currentModel = model;
+            GmmModel curModel = model;
 
             do {
-                UpdateResult updateResult = updateModel(dataset, currentModel);
-                currentModel = updateResult.model;
+                UpdateResult updateResult = updateModel(dataset, curModel);
+                curModel = updateResult.model;
 
-                double minCompProb = currentModel.componentsProbs().minElement().get();
+                double minCompProb = curModel.componentsProbs().minElement().get();
                 if (countOfComponents >= maxCountOfClusters || minCompProb < minClusterProbability)
                     break;
 
                 double maxXProb = updateResult.maxProbInDataset;
                 NewComponentStatisticsAggregator newMeanAdder = NewComponentStatisticsAggregator.computeNewMean(dataset,
-                    maxXProb, maxLikelihoodDivergence, currentModel);
+                    maxXProb, maxLikelihoodDivergence, curModel);
 
                 Vector newMean = newMeanAdder.mean();
                 if (newMeanAdder.rowCountForNewCluster() < minElementsForNewCluster)
@@ -281,21 +281,21 @@ public class GmmTrainer extends SingleLabelDatasetTrainer<GmmModel> {
 
                 countOfComponents += 1;
                 Vector[] newMeans = new Vector[countOfComponents];
-                for (int i = 0; i < currentModel.countOfComponents(); i++)
-                    newMeans[i] = currentModel.distributions().get(i).mean();
+                for (int i = 0; i < curModel.countOfComponents(); i++)
+                    newMeans[i] = curModel.distributions().get(i).mean();
                 newMeans[countOfComponents - 1] = newMean;
 
                 initialMeans = newMeans;
 
                 Optional<GmmModel> newModelOpt = init(dataset);
                 if (newModelOpt.isPresent())
-                    currentModel = newModelOpt.get();
+                    curModel = newModelOpt.get();
                 else
                     break;
             }
             while (true);
 
-            return filterModel(currentModel);
+            return filterModel(curModel);
         });
     }
 
@@ -379,7 +379,7 @@ public class GmmTrainer extends SingleLabelDatasetTrainer<GmmModel> {
      */
     @NotNull private UpdateResult updateModel(Dataset<EmptyContext, GmmPartitionData> dataset, GmmModel model) {
         boolean isConverged = false;
-        int countOfIterations = 0;
+        int cntOfIterations = 0;
         double maxProbInDataset = Double.NEGATIVE_INFINITY;
         while (!isConverged) {
             MeanWithClusterProbAggregator.AggregatedStats stats = MeanWithClusterProbAggregator.aggreateStats(dataset, countOfComponents);
@@ -394,8 +394,8 @@ public class GmmTrainer extends SingleLabelDatasetTrainer<GmmModel> {
                 List<MultivariateGaussianDistribution> components = buildComponents(newMeans, newCovs);
                 GmmModel newModel = new GmmModel(clusterProbs, components);
 
-                countOfIterations += 1;
-                isConverged = isConverged(model, newModel) || countOfIterations > maxCountOfIterations;
+                cntOfIterations += 1;
+                isConverged = isConverged(model, newModel) || cntOfIterations > maxCountOfIterations;
                 model = newModel;
                 maxProbInDataset = GmmPartitionData.updatePcxiAndComputeLikelihood(dataset, clusterProbs, components);
             }
@@ -441,18 +441,18 @@ public class GmmTrainer extends SingleLabelDatasetTrainer<GmmModel> {
 
                 dataset.compute(data -> GmmPartitionData.estimateLikelihoodClusters(data, initialMeans));
 
-                List<Matrix> initialCovs = CovarianceMatricesAggregator.computeCovariances(
+                List<Matrix> initCovs = CovarianceMatricesAggregator.computeCovariances(
                     dataset,
                     VectorUtils.fill(1. / countOfComponents, countOfComponents),
                     initialMeans
                 );
 
-                if (initialCovs.isEmpty())
+                if (initCovs.isEmpty())
                     return Optional.empty();
 
                 List<MultivariateGaussianDistribution> distributions = new ArrayList<>();
                 for (int i = 0; i < countOfComponents; i++)
-                    distributions.add(new MultivariateGaussianDistribution(initialMeans[i], initialCovs.get(i)));
+                    distributions.add(new MultivariateGaussianDistribution(initialMeans[i], initCovs.get(i)));
 
                 return Optional.of(new GmmModel(
                     VectorUtils.of(DoubleStream.generate(() -> 1. / countOfComponents).limit(countOfComponents).toArray()),
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/composition/predictionsaggregator/OnMajorityPredictionsAggregator.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/composition/predictionsaggregator/OnMajorityPredictionsAggregator.java
index 995faad2..d6f5dcf9 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/composition/predictionsaggregator/OnMajorityPredictionsAggregator.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/composition/predictionsaggregator/OnMajorityPredictionsAggregator.java
@@ -32,9 +32,9 @@ public final class OnMajorityPredictionsAggregator implements PredictionsAggrega
 
         Map<Double, Integer> cntrsByCls = new HashMap<>();
 
-        for (Double predictedValue : estimations) {
-            Integer cntrVal = cntrsByCls.getOrDefault(predictedValue, 0) + 1;
-            cntrsByCls.put(predictedValue, cntrVal);
+        for (Double predictedVal : estimations) {
+            Integer cntrVal = cntrsByCls.getOrDefault(predictedVal, 0) + 1;
+            cntrsByCls.put(predictedVal, cntrVal);
         }
 
         return cntrsByCls.entrySet().stream()
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/dataset/impl/cache/CacheBasedDatasetBuilder.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/dataset/impl/cache/CacheBasedDatasetBuilder.java
index c3d4135f..f323231b 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/dataset/impl/cache/CacheBasedDatasetBuilder.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/dataset/impl/cache/CacheBasedDatasetBuilder.java
@@ -140,13 +140,13 @@ public class CacheBasedDatasetBuilder<K, V> implements DatasetBuilder<K, V> {
 
         // Retrieves affinity function of the upstream Ignite Cache.
         CacheConfiguration<K, V> upstreamCacheConfiguration = upstreamCache.getConfiguration(CacheConfiguration.class);
-        AffinityFunction upstreamCacheAffinity = upstreamCacheConfiguration.getAffinity();
+        AffinityFunction upstreamAff = upstreamCacheConfiguration.getAffinity();
 
         // Creates dataset cache configuration with affinity function that mimics to affinity function of the upstream
         // cache.
         CacheConfiguration<Integer, C> datasetCacheConfiguration = new CacheConfiguration<>();
         datasetCacheConfiguration.setName(String.format(DATASET_CACHE_TEMPLATE, upstreamCache.getName(), datasetId));
-        datasetCacheConfiguration.setAffinity(new DatasetAffinityFunctionWrapper(upstreamCacheAffinity));
+        datasetCacheConfiguration.setAffinity(new DatasetAffinityFunctionWrapper(upstreamAff));
 
         IgniteCache<Integer, C> datasetCache = ignite.createCache(datasetCacheConfiguration);
 
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/dataset/impl/cache/util/ComputeUtils.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/dataset/impl/cache/util/ComputeUtils.java
index 5b50c942..9873a6dd 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/dataset/impl/cache/util/ComputeUtils.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/dataset/impl/cache/util/ComputeUtils.java
@@ -92,8 +92,8 @@ public final class ComputeUtils {
 
         String primaryCache = cacheNames.iterator().next();
 
-        Affinity<?> affinity = ignite.affinity(primaryCache);
-        int partitions = affinity.partitions();
+        Affinity<?> aff = ignite.affinity(primaryCache);
+        int partitions = aff.partitions();
 
         BitSet completionFlags = new BitSet(partitions);
         Collection<R> results = new ArrayList<>();
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/environment/deploy/DeployingContextImpl.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/environment/deploy/DeployingContextImpl.java
index b68bd84d..cc99035b 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/environment/deploy/DeployingContextImpl.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/environment/deploy/DeployingContextImpl.java
@@ -55,17 +55,17 @@ public class DeployingContextImpl implements DeployingContext, Serializable {
         if (preprocessorCls != null)
             logger.warn("Reinitialize deploying context [class=" + jobObj.getClass().getName() + "]");
 
-        Object objectToDeploy = jobObj;
-        while (objectToDeploy instanceof DeployableObject) {
-            List<Object> deps = ((DeployableObject)objectToDeploy).getDependencies();
+        Object objToDeploy = jobObj;
+        while (objToDeploy instanceof DeployableObject) {
+            List<Object> deps = ((DeployableObject)objToDeploy).getDependencies();
             if (deps.isEmpty())
                 break;
             else
-                objectToDeploy = deps.get(0);
+                objToDeploy = deps.get(0);
         }
 
-        assert objectToDeploy != null;
-        preprocessorCls = objectToDeploy.getClass();
+        assert objToDeploy != null;
+        preprocessorCls = objToDeploy.getClass();
         clientClsLdr = preprocessorCls.getClassLoader();
     }
 
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/inference/json/JacksonHelper.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/inference/json/JacksonHelper.java
index 9763921f..b3b60b92 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/inference/json/JacksonHelper.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/inference/json/JacksonHelper.java
@@ -29,13 +29,13 @@ public class JacksonHelper {
     /** */
     public static void readAndValidateBasicJsonModelProperties(Path path, ObjectMapper mapper, String className) throws IOException {
         Map jsonAsMap = mapper.readValue(new File(path.toAbsolutePath().toString()), LinkedHashMap.class);
-        String formatVersion = jsonAsMap.get("formatVersion").toString();
+        String formatVer = jsonAsMap.get("formatVer").toString();
         Long timestamp = (Long)jsonAsMap.get("timestamp");
         String uid = jsonAsMap.get("uid").toString();
-        String modelClass = jsonAsMap.get("modelClass").toString();
+        String modelCls = jsonAsMap.get("modelCls").toString();
 
-        if (!modelClass.equals(className)) {
-            throw new IllegalArgumentException("You are trying to load " + modelClass + " model to " + className);
+        if (!modelCls.equals(className)) {
+            throw new IllegalArgumentException("You are trying to load " + modelCls + " model to " + className);
         }
     }
 }
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/knn/classification/KNNClassificationModel.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/knn/classification/KNNClassificationModel.java
index 014c2ec7..18ce1a1d 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/knn/classification/KNNClassificationModel.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/knn/classification/KNNClassificationModel.java
@@ -66,9 +66,9 @@ public class KNNClassificationModel extends KNNModel<Double> {
      * @return Label with max votes for it.
      */
     private Double election(List<LabeledVector<Double>> neighbours, Vector pnt) {
-        Collection<GroupedNeighbours> groups = groupByLabel(neighbours);
+        Collection<GroupedNeighbours> grps = groupByLabel(neighbours);
 
-        return election(groups, pnt);
+        return election(grps, pnt);
     }
 
     /**
@@ -119,21 +119,21 @@ public class KNNClassificationModel extends KNNModel<Double> {
      * @return Collection of grouped neighbours (each group contains neighbours with the same label).
      */
     private Collection<GroupedNeighbours> groupByLabel(List<LabeledVector<Double>> neighbours) {
-        Map<Double, GroupedNeighbours> groups = new HashMap<>();
+        Map<Double, GroupedNeighbours> grps = new HashMap<>();
 
         for (LabeledVector<Double> neighbour : neighbours) {
             double lb = neighbour.label();
 
-            GroupedNeighbours groupedNeighbours = groups.get(lb);
+            GroupedNeighbours groupedNeighbours = grps.get(lb);
             if (groupedNeighbours == null) {
                 groupedNeighbours = new GroupedNeighbours(lb);
-                groups.put(lb, groupedNeighbours);
+                grps.put(lb, groupedNeighbours);
             }
 
             groupedNeighbours.addNeighbour(neighbour.features());
         }
 
-        return Collections.unmodifiableCollection(groups.values());
+        return Collections.unmodifiableCollection(grps.values());
     }
 
     /**
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/math/Blas.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/math/Blas.java
index d29483d6..1dfdba9c 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/math/Blas.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/math/Blas.java
@@ -163,15 +163,15 @@ public class Blas implements Serializable {
         double av;
         double[] uData = u.getStorage().data();
 
-        for (Integer nonDefaultInd : v.indexes()) {
-            startInd += (nonDefaultInd - prevNonDfltInd) * (nonDefaultInd + prevNonDfltInd + 1) / 2;
-            av = alpha * v.get(nonDefaultInd);
+        for (Integer nonDflt : v.indexes()) {
+            startInd += (nonDflt - prevNonDfltInd) * (nonDflt + prevNonDfltInd + 1) / 2;
+            av = alpha * v.get(nonDflt);
 
             for (Integer i : v.indexes())
-                if (i <= nonDefaultInd)
+                if (i <= nonDflt)
                     uData[startInd + i] += av * v.getX(i);
 
-            prevNonDfltInd = nonDefaultInd;
+            prevNonDfltInd = nonDflt;
         }
     }
 
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/math/Tracer.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/math/Tracer.java
index 387c7d85..291a18af 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/math/Tracer.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/math/Tracer.java
@@ -402,8 +402,8 @@ public class Tracer {
         if (isLabeled) {
             Set<Double> lbls = values.stream().map(LabeledVector::label).collect(Collectors.toSet());
             Random rnd = new Random(0);
-            for (Double label : lbls)
-                labelsMapping.put(label.intValue(), new Color(rnd.nextInt()));
+            for (Double lbl : lbls)
+                labelsMapping.put(lbl.intValue(), new Color(rnd.nextInt()));
         }
 
         showVectorsHtml(name, values, xIdx,
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/math/primitives/vector/impl/SparseVector.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/math/primitives/vector/impl/SparseVector.java
index fab7cd44..627c3bfe 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/math/primitives/vector/impl/SparseVector.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/math/primitives/vector/impl/SparseVector.java
@@ -90,8 +90,8 @@ public class SparseVector extends AbstractVector implements StorageConstants {
             @Override public boolean tryAdvance(Consumer<? super Double> act) {
                 Set<Integer> indexes = storage().indexes();
 
-                for (Integer index : indexes)
-                    act.accept(storageGet(index));
+                for (Integer idx : indexes)
+                    act.accept(storageGet(idx));
 
                 return true;
             }
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/compound/CompoundNaiveBayesModel.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/compound/CompoundNaiveBayesModel.java
index 005f64f6..65121436 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/compound/CompoundNaiveBayesModel.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/compound/CompoundNaiveBayesModel.java
@@ -182,12 +182,12 @@ public class CompoundNaiveBayesModel implements IgniteModel<Vector, Double>, Exp
         int newSize = vector.size() - featureIdsToSkip.size();
         double[] newFeaturesValues = new double[newSize];
 
-        int index = 0;
+        int idx = 0;
         for (int j = 0; j < vector.size(); j++) {
             if (featureIdsToSkip.contains(j)) continue;
 
-            newFeaturesValues[index] = vector.get(j);
-            ++index;
+            newFeaturesValues[idx] = vector.get(j);
+            ++idx;
         }
         return VectorUtils.of(newFeaturesValues);
     }
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/compound/CompoundNaiveBayesTrainer.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/compound/CompoundNaiveBayesTrainer.java
index 21689636..458b2926 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/compound/CompoundNaiveBayesTrainer.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/compound/CompoundNaiveBayesTrainer.java
@@ -153,12 +153,12 @@ public class CompoundNaiveBayesTrainer extends SingleLabelDatasetTrainer<Compoun
             int newSize = size - featureIdsToSkip.size();
 
             double[] newFeaturesValues = new double[newSize];
-            int index = 0;
+            int idx = 0;
             for (int j = 0; j < size; j++) {
                 if (featureIdsToSkip.contains(j)) continue;
 
-                newFeaturesValues[index] = featureValues.get(j);
-                ++index;
+                newFeaturesValues[idx] = featureValues.get(j);
+                ++idx;
             }
             return new LabeledVector<>(VectorUtils.of(newFeaturesValues), featureValues.label());
         };
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/discrete/DiscreteNaiveBayesTrainer.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/discrete/DiscreteNaiveBayesTrainer.java
index a1d4c928..46c3b1f7 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/discrete/DiscreteNaiveBayesTrainer.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/discrete/DiscreteNaiveBayesTrainer.java
@@ -134,15 +134,15 @@ public class DiscreteNaiveBayesTrainer extends SingleLabelDatasetTrainer<Discret
             int featureCnt = sumsHolder.valuesInBucketPerLbl.get(sortedLabels.get(0)).length;
 
             double[][][] probabilities = new double[lbCnt][featureCnt][];
-            double[] classProbabilities = new double[lbCnt];
+            double[] clsProbabilities = new double[lbCnt];
             double[] labels = new double[lbCnt];
             long datasetSize = sumsHolder.featureCountersPerLbl.values().stream().mapToInt(i -> i).sum();
 
             int lbl = 0;
 
-            for (Double label : sortedLabels) {
-                int cnt = sumsHolder.featureCountersPerLbl.get(label);
-                long[][] sum = sumsHolder.valuesInBucketPerLbl.get(label);
+            for (Double srtLbl : sortedLabels) {
+                int cnt = sumsHolder.featureCountersPerLbl.get(srtLbl);
+                long[][] sum = sumsHolder.valuesInBucketPerLbl.get(srtLbl);
 
                 for (int i = 0; i < featureCnt; i++) {
 
@@ -154,18 +154,18 @@ public class DiscreteNaiveBayesTrainer extends SingleLabelDatasetTrainer<Discret
                 }
 
                 if (equiprobableClasses)
-                    classProbabilities[lbl] = 1. / lbCnt;
+                    clsProbabilities[lbl] = 1. / lbCnt;
                 else if (priorProbabilities != null) {
-                    assert classProbabilities.length == priorProbabilities.length;
-                    classProbabilities[lbl] = priorProbabilities[lbl];
+                    assert clsProbabilities.length == priorProbabilities.length;
+                    clsProbabilities[lbl] = priorProbabilities[lbl];
                 }
                 else
-                    classProbabilities[lbl] = (double)cnt / datasetSize;
+                    clsProbabilities[lbl] = (double)cnt / datasetSize;
 
-                labels[lbl] = label;
+                labels[lbl] = srtLbl;
                 ++lbl;
             }
-            return new DiscreteNaiveBayesModel(probabilities, classProbabilities, labels, bucketThresholds, sumsHolder);
+            return new DiscreteNaiveBayesModel(probabilities, clsProbabilities, labels, bucketThresholds, sumsHolder);
         }
         catch (Exception e) {
             throw new RuntimeException(e);
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/gaussian/GaussianNaiveBayesTrainer.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/gaussian/GaussianNaiveBayesTrainer.java
index 0875736e..794d1c20 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/gaussian/GaussianNaiveBayesTrainer.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/naivebayes/gaussian/GaussianNaiveBayesTrainer.java
@@ -74,27 +74,27 @@ public class GaussianNaiveBayesTrainer extends SingleLabelDatasetTrainer<Gaussia
 
                     LabeledVector lv = extractor.apply(entity.getKey(), entity.getValue());
                     Vector features = lv.features();
-                    Double label = (Double)lv.label();
+                    Double lbl = (Double)lv.label();
 
                     double[] toMeans;
                     double[] sqSum;
 
-                    if (!res.featureSumsPerLbl.containsKey(label)) {
+                    if (!res.featureSumsPerLbl.containsKey(lbl)) {
                         toMeans = new double[features.size()];
                         Arrays.fill(toMeans, 0.);
-                        res.featureSumsPerLbl.put(label, toMeans);
+                        res.featureSumsPerLbl.put(lbl, toMeans);
                     }
-                    if (!res.featureSquaredSumsPerLbl.containsKey(label)) {
+                    if (!res.featureSquaredSumsPerLbl.containsKey(lbl)) {
                         sqSum = new double[features.size()];
-                        res.featureSquaredSumsPerLbl.put(label, sqSum);
+                        res.featureSquaredSumsPerLbl.put(lbl, sqSum);
                     }
-                    if (!res.featureCountersPerLbl.containsKey(label))
-                        res.featureCountersPerLbl.put(label, 0);
+                    if (!res.featureCountersPerLbl.containsKey(lbl))
+                        res.featureCountersPerLbl.put(lbl, 0);
 
-                    res.featureCountersPerLbl.put(label, res.featureCountersPerLbl.get(label) + 1);
+                    res.featureCountersPerLbl.put(lbl, res.featureCountersPerLbl.get(lbl) + 1);
 
-                    toMeans = res.featureSumsPerLbl.get(label);
-                    sqSum = res.featureSquaredSumsPerLbl.get(label);
+                    toMeans = res.featureSumsPerLbl.get(lbl);
+                    sqSum = res.featureSquaredSumsPerLbl.get(lbl);
                     for (int j = 0; j < features.size(); j++) {
                         double x = features.get(j);
                         toMeans[j] += x;
@@ -118,42 +118,42 @@ public class GaussianNaiveBayesTrainer extends SingleLabelDatasetTrainer<Gaussia
             sortedLabels.sort(Double::compareTo);
             assert !sortedLabels.isEmpty() : "The dataset should contain at least one feature";
 
-            int labelCount = sortedLabels.size();
-            int featureCount = sumsHolder.featureSumsPerLbl.get(sortedLabels.get(0)).length;
+            int lblCnt = sortedLabels.size();
+            int featureCnt = sumsHolder.featureSumsPerLbl.get(sortedLabels.get(0)).length;
 
-            double[][] means = new double[labelCount][featureCount];
-            double[][] variances = new double[labelCount][featureCount];
-            double[] classProbabilities = new double[labelCount];
-            double[] labels = new double[labelCount];
+            double[][] means = new double[lblCnt][featureCnt];
+            double[][] variances = new double[lblCnt][featureCnt];
+            double[] clsProbabilities = new double[lblCnt];
+            double[] labels = new double[lblCnt];
 
             long datasetSize = sumsHolder.featureCountersPerLbl.values().stream().mapToInt(i -> i).sum();
 
             int lbl = 0;
-            for (Double label : sortedLabels) {
-                int count = sumsHolder.featureCountersPerLbl.get(label);
-                double[] sum = sumsHolder.featureSumsPerLbl.get(label);
-                double[] sqSum = sumsHolder.featureSquaredSumsPerLbl.get(label);
-
-                for (int i = 0; i < featureCount; i++) {
-                    means[lbl][i] = sum[i] / count;
-                    variances[lbl][i] = (sqSum[i] - sum[i] * sum[i] / count) / count;
+            for (Double srtLbl : sortedLabels) {
+                int cnt = sumsHolder.featureCountersPerLbl.get(srtLbl);
+                double[] sum = sumsHolder.featureSumsPerLbl.get(srtLbl);
+                double[] sqSum = sumsHolder.featureSquaredSumsPerLbl.get(srtLbl);
+
+                for (int i = 0; i < featureCnt; i++) {
+                    means[lbl][i] = sum[i] / cnt;
+                    variances[lbl][i] = (sqSum[i] - sum[i] * sum[i] / cnt) / cnt;
                 }
 
                 if (equiprobableClasses)
-                    classProbabilities[lbl] = 1. / labelCount;
+                    clsProbabilities[lbl] = 1. / lblCnt;
 
                 else if (priorProbabilities != null) {
-                    assert classProbabilities.length == priorProbabilities.length;
-                    classProbabilities[lbl] = priorProbabilities[lbl];
+                    assert clsProbabilities.length == priorProbabilities.length;
+                    clsProbabilities[lbl] = priorProbabilities[lbl];
                 }
                 else
-                    classProbabilities[lbl] = (double)count / datasetSize;
+                    clsProbabilities[lbl] = (double)cnt / datasetSize;
 
-                labels[lbl] = label;
+                labels[lbl] = srtLbl;
                 ++lbl;
             }
 
-            return new GaussianNaiveBayesModel(means, variances, classProbabilities, labels, sumsHolder);
+            return new GaussianNaiveBayesModel(means, variances, clsProbabilities, labels, sumsHolder);
         }
         catch (Exception e) {
             throw new RuntimeException(e);
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/EncoderTrainer.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/EncoderTrainer.java
index 5d01ac48..43c919d6 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/EncoderTrainer.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/EncoderTrainer.java
@@ -469,7 +469,7 @@ public class EncoderTrainer<K, V> implements PreprocessingTrainer<K, V> {
             assert targetCounters.length == row.size() : "Base preprocessor must return exactly "
                 + targetCounters.length + " features";
 
-        double targetValue = row.features().get(targetLabelIndex);
+        double targetVal = row.features().get(targetLabelIndex);
 
         for (int i = 0; i < targetCounters.length; i++) {
             if (handledIndices.contains(i)) {
@@ -491,7 +491,7 @@ public class EncoderTrainer<K, V> implements PreprocessingTrainer<K, V> {
 
                 TargetCounter targetCounter = targetCounters[i];
                 targetCounter.setTargetCount(targetCounter.getTargetCount() + 1);
-                targetCounter.setTargetSum(targetCounter.getTargetSum() + targetValue);
+                targetCounter.setTargetSum(targetCounter.getTargetSum() + targetVal);
 
                 Map<String, Long> categoryCounts = targetCounter.getCategoryCounts();
 
@@ -504,10 +504,10 @@ public class EncoderTrainer<K, V> implements PreprocessingTrainer<K, V> {
 
                 Map<String, Double> categoryTargetSum = targetCounter.getCategoryTargetSum();
                 if (categoryTargetSum.containsKey(strVal)) {
-                    categoryTargetSum.put(strVal, categoryTargetSum.get(strVal) + targetValue);
+                    categoryTargetSum.put(strVal, categoryTargetSum.get(strVal) + targetVal);
                 }
                 else {
-                    categoryTargetSum.put(strVal, targetValue);
+                    categoryTargetSum.put(strVal, targetVal);
                 }
             }
         }
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/onehotencoder/OneHotEncoderPreprocessor.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/onehotencoder/OneHotEncoderPreprocessor.java
index b1f8f34d..fabada37 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/onehotencoder/OneHotEncoderPreprocessor.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/onehotencoder/OneHotEncoderPreprocessor.java
@@ -122,9 +122,9 @@ public final class OneHotEncoderPreprocessor<K, V> extends EncoderPreprocessor<K
      */
     private int getAdditionalSize(Map<String, Integer>[] encodingValues) {
         int newSize = 0;
-        for (Map<String, Integer> encodingValue : encodingValues) {
-            if (encodingValue != null)
-                newSize += encodingValue.size(); // - 1 if we don't keep NULL values and it has NULL values
+        for (Map<String, Integer> encodingVal : encodingValues) {
+            if (encodingVal != null)
+                newSize += encodingVal.size(); // - 1 if we don't keep NULL values and it has NULL values
         }
         return newSize;
     }
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/selection/paramgrid/ParameterSetGenerator.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/selection/paramgrid/ParameterSetGenerator.java
index a2f76534..1998be59 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/selection/paramgrid/ParameterSetGenerator.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/selection/paramgrid/ParameterSetGenerator.java
@@ -83,8 +83,8 @@ public class ParameterSetGenerator {
 
         Double[] valuesOfCurrDimension = map.get(dimensionNum);
 
-        for (Double specificValue : valuesOfCurrDimension) {
-            nextPnt[dimensionNum] = specificValue;
+        for (Double specificVal : valuesOfCurrDimension) {
+            nextPnt[dimensionNum] = specificVal;
             traverseTree(map, nextPnt, dimensionNum);
         }
     }
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTreeTrainer.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTreeTrainer.java
index 0692ec62..d567eaef 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTreeTrainer.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTreeTrainer.java
@@ -224,13 +224,13 @@ public abstract class DecisionTreeTrainer<T extends ImpurityMeasure<T>> extends
         for (int col = 0; col < criterionFunctions.length; col++) {
             StepFunction<T> criterionFunctionForCol = criterionFunctions[col];
 
-            double[] arguments = criterionFunctionForCol.getX();
+            double[] args = criterionFunctionForCol.getX();
             T[] values = criterionFunctionForCol.getY();
 
             for (int leftSize = 1; leftSize < values.length - 1; leftSize++) {
                 if ((values[0].impurity() - values[leftSize].impurity()) > minImpurityDecrease
                     && (res == null || values[leftSize].compareTo(res.val) < 0))
-                    res = new SplitPoint<>(values[leftSize], col, calculateThreshold(arguments, leftSize));
+                    res = new SplitPoint<>(values[leftSize], col, calculateThreshold(args, leftSize));
             }
         }
 
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/tree/impurity/util/SimpleStepFunctionCompressor.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/tree/impurity/util/SimpleStepFunctionCompressor.java
index 24185710..39fe986b 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/tree/impurity/util/SimpleStepFunctionCompressor.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/tree/impurity/util/SimpleStepFunctionCompressor.java
@@ -63,14 +63,14 @@ public class SimpleStepFunctionCompressor<T extends ImpurityMeasure<T>> implemen
 
     /** {@inheritDoc} */
     @Override public StepFunction<T> compress(StepFunction<T> function) {
-        double[] arguments = function.getX();
+        double[] args = function.getX();
         T[] values = function.getY();
 
-        if (arguments.length >= minSizeToBeCompressed) {
+        if (args.length >= minSizeToBeCompressed) {
             List<StepFunctionPoint> points = new ArrayList<>();
 
-            for (int i = 0; i < arguments.length; i++)
-                points.add(new StepFunctionPoint(arguments[i], values[i]));
+            for (int i = 0; i < args.length; i++)
+                points.add(new StepFunctionPoint(args[i], values[i]));
 
             points = compress(points);
 
diff --git a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/tree/randomforest/RandomForestClassifierTrainer.java b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/tree/randomforest/RandomForestClassifierTrainer.java
index ab8db2e5..9679906c 100644
--- a/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/tree/randomforest/RandomForestClassifierTrainer.java
+++ b/modules/ml-ext/ml/src/main/java/org/apache/ignite/ml/tree/randomforest/RandomForestClassifierTrainer.java
@@ -90,8 +90,8 @@ public class RandomForestClassifierTrainer
             return false;
 
         int i = 0;
-        for (Double label : uniqLabels)
-            lblMapping.put(label, i++);
+        for (Double lbl : uniqLabels)
+            lblMapping.put(lbl, i++);
 
         return super.init(dataset);
     }
diff --git a/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/clustering/gmm/NewComponentStatisticsAggregatorTest.java b/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/clustering/gmm/NewComponentStatisticsAggregatorTest.java
index 83a4f17a..54e60d69 100644
--- a/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/clustering/gmm/NewComponentStatisticsAggregatorTest.java
+++ b/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/clustering/gmm/NewComponentStatisticsAggregatorTest.java
@@ -74,12 +74,12 @@ public class NewComponentStatisticsAggregatorTest {
     @Test
     public void testAdd() {
         NewComponentStatisticsAggregator agg = new NewComponentStatisticsAggregator();
-        int rowCount = 10;
-        for (int i = 0; i < rowCount; i++)
+        int rowCnt = 10;
+        for (int i = 0; i < rowCnt; i++)
             agg.add(VectorUtils.of(0, 1, 2), i % 2 == 0);
 
-        assertEquals(rowCount / 2, agg.rowCountForNewCluster());
-        assertEquals(rowCount, agg.totalRowCount());
+        assertEquals(rowCnt / 2, agg.rowCountForNewCluster());
+        assertEquals(rowCnt, agg.totalRowCount());
         assertArrayEquals(new double[] {0, 1, 2}, agg.mean().asArray(), 1e-4);
     }
 
@@ -88,16 +88,16 @@ public class NewComponentStatisticsAggregatorTest {
     public void testPlus() {
         NewComponentStatisticsAggregator agg1 = new NewComponentStatisticsAggregator();
         NewComponentStatisticsAggregator agg2 = new NewComponentStatisticsAggregator();
-        int rowCount = 10;
-        for (int i = 0; i < rowCount; i++)
+        int rowCnt = 10;
+        for (int i = 0; i < rowCnt; i++)
             agg1.add(VectorUtils.of(0, 1, 2), i % 2 == 0);
 
-        for (int i = 0; i < rowCount; i++)
+        for (int i = 0; i < rowCnt; i++)
             agg2.add(VectorUtils.of(2, 1, 0), i % 2 == 1);
 
         NewComponentStatisticsAggregator sum = agg1.plus(agg2);
-        assertEquals(rowCount, sum.rowCountForNewCluster());
-        assertEquals(rowCount * 2, sum.totalRowCount());
+        assertEquals(rowCnt, sum.rowCountForNewCluster());
+        assertEquals(rowCnt * 2, sum.totalRowCount());
         assertArrayEquals(new double[] {1, 1, 1}, sum.mean().asArray(), 1e-4);
     }
 
diff --git a/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/dataset/impl/cache/CacheBasedDatasetBuilderTest.java b/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/dataset/impl/cache/CacheBasedDatasetBuilderTest.java
index 55c9a160..e5c600c5 100644
--- a/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/dataset/impl/cache/CacheBasedDatasetBuilderTest.java
+++ b/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/dataset/impl/cache/CacheBasedDatasetBuilderTest.java
@@ -71,17 +71,17 @@ public class CacheBasedDatasetBuilderTest extends GridCommonAbstractTest {
             TestUtils.testEnvBuilder().buildForTrainer()
         );
 
-        Affinity<Integer> upstreamAffinity = ignite.affinity(upstreamCache.getName());
-        Affinity<Integer> datasetAffinity = ignite.affinity(dataset.getDatasetCache().getName());
+        Affinity<Integer> upstreamAff = ignite.affinity(upstreamCache.getName());
+        Affinity<Integer> datasetAff = ignite.affinity(dataset.getDatasetCache().getName());
 
-        int upstreamPartitions = upstreamAffinity.partitions();
-        int datasetPartitions = datasetAffinity.partitions();
+        int upstreamPartitions = upstreamAff.partitions();
+        int datasetPartitions = datasetAff.partitions();
 
         assertEquals(upstreamPartitions, datasetPartitions);
 
         for (int part = 0; part < upstreamPartitions; part++) {
-            Collection<ClusterNode> upstreamPartNodes = upstreamAffinity.mapPartitionToPrimaryAndBackups(part);
-            Collection<ClusterNode> datasetPartNodes = datasetAffinity.mapPartitionToPrimaryAndBackups(part);
+            Collection<ClusterNode> upstreamPartNodes = upstreamAff.mapPartitionToPrimaryAndBackups(part);
+            Collection<ClusterNode> datasetPartNodes = datasetAff.mapPartitionToPrimaryAndBackups(part);
 
             assertEqualsCollections(upstreamPartNodes, datasetPartNodes);
         }
diff --git a/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/math/distances/DistanceTest.java b/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/math/distances/DistanceTest.java
index 40949c49..fcd35086 100644
--- a/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/math/distances/DistanceTest.java
+++ b/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/math/distances/DistanceTest.java
@@ -68,9 +68,9 @@ public class DistanceTest {
     public void distanceFromPointToItselfIsZero() {
         DISTANCE_MEASURES.forEach(distance -> {
             Vector vector = randomVector(3);
-            String errorMessage = errorMessage(distance, vector, vector);
+            String errMsg = errorMessage(distance, vector, vector);
 
-            assertEquals(errorMessage, 0d, distance.compute(vector, vector), PRECISION);
+            assertEquals(errMsg, 0d, distance.compute(vector, vector), PRECISION);
         });
     }
 
@@ -80,9 +80,9 @@ public class DistanceTest {
         DISTANCE_MEASURES.forEach(distance -> {
             Vector vector1 = randomVector(3);
             Vector vector2 = randomVector(3);
-            String errorMessage = errorMessage(distance, vector1, vector2);
+            String errMsg = errorMessage(distance, vector1, vector2);
 
-            assertEquals(errorMessage,
+            assertEquals(errMsg,
                 distance.compute(vector1, vector2), distance.compute(vector2, vector1), PRECISION);
         });
     }
@@ -93,9 +93,9 @@ public class DistanceTest {
         DISTANCE_MEASURES.forEach(distance -> {
             Vector vector1 = randomVector(3);
             Vector vector2 = randomVector(3);
-            String errorMessage = errorMessage(distance, vector1, vector2);
+            String errMsg = errorMessage(distance, vector1, vector2);
 
-            assertTrue(errorMessage, distance.compute(vector1, vector2) > 0);
+            assertTrue(errMsg, distance.compute(vector1, vector2) > 0);
         });
     }
 
diff --git a/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/naivebayes/discrete/DiscreteNaiveBayesModelTest.java b/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/naivebayes/discrete/DiscreteNaiveBayesModelTest.java
index 7d6d4940..d863e132 100644
--- a/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/naivebayes/discrete/DiscreteNaiveBayesModelTest.java
+++ b/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/naivebayes/discrete/DiscreteNaiveBayesModelTest.java
@@ -34,9 +34,9 @@ public class DiscreteNaiveBayesModelTest {
             {{0, 1}, {1. / 7, 2. / 7, 4. / 7}, {4. / 7, 3. / 7}, {2. / 7, 3. / 7, 2. / 7}, {4. / 7, 3. / 7}}
         };
 
-        double[] classProbabilities = new double[] {6. / 13, 7. / 13};
+        double[] clsProbabilities = new double[] {6. / 13, 7. / 13};
         double[][] thresholds = new double[][] {{.5}, {.2, .7}, {.5}, {.5, 1.5}, {.5}};
-        DiscreteNaiveBayesModel mdl = new DiscreteNaiveBayesModel(probabilities, classProbabilities,
+        DiscreteNaiveBayesModel mdl = new DiscreteNaiveBayesModel(probabilities, clsProbabilities,
                 new double[] {first, second}, thresholds, new DiscreteNaiveBayesSumsHolder());
         Vector observation = VectorUtils.of(2, 0, 1, 2, 0);
 
diff --git a/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/preprocessing/encoding/EncoderTrainerTest.java b/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/preprocessing/encoding/EncoderTrainerTest.java
index faae5602..79f4286b 100644
--- a/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/preprocessing/encoding/EncoderTrainerTest.java
+++ b/modules/ml-ext/ml/src/test/java/org/apache/ignite/ml/preprocessing/encoding/EncoderTrainerTest.java
@@ -239,10 +239,10 @@ public class EncoderTrainerTest extends TrainerTest {
 
         DatasetBuilder<Integer, Object[]> datasetBuilder = new LocalDatasetBuilder<>(data, parts);
 
-        EncoderTrainer<Integer, Object[]> labelEncoderTrainer = new EncoderTrainer<Integer, Object[]>()
+        EncoderTrainer<Integer, Object[]> lblEncTrainer = new EncoderTrainer<Integer, Object[]>()
             .withEncoderType(EncoderType.LABEL_ENCODER);
 
-        EncoderPreprocessor<Integer, Object[]> preprocessor = labelEncoderTrainer.fit(
+        EncoderPreprocessor<Integer, Object[]> preprocessor = lblEncTrainer.fit(
             TestUtils.testEnvBuilder(),
             datasetBuilder,
             vectorizer
diff --git a/modules/ml-ext/ml/xgboost-model-parser/src/test/java/org/apache/ignite/ml/xgboost/parser/XGBoostModelParserTest.java b/modules/ml-ext/ml/xgboost-model-parser/src/test/java/org/apache/ignite/ml/xgboost/parser/XGBoostModelParserTest.java
index cdae686b..db667753 100644
--- a/modules/ml-ext/ml/xgboost-model-parser/src/test/java/org/apache/ignite/ml/xgboost/parser/XGBoostModelParserTest.java
+++ b/modules/ml-ext/ml/xgboost-model-parser/src/test/java/org/apache/ignite/ml/xgboost/parser/XGBoostModelParserTest.java
@@ -67,8 +67,8 @@ public class XGBoostModelParserTest {
 
                 HashMap<String, Double> testObj = new HashMap<>();
 
-                for (String keyValueString : testDataStr.split(" ")) {
-                    String[] keyVal = keyValueString.split(":");
+                for (String keyValStr : testDataStr.split(" ")) {
+                    String[] keyVal = keyValStr.split(":");
 
                     if (keyVal.length == 2)
                         testObj.put("f" + keyVal[0], Double.parseDouble(keyVal[1]));
diff --git a/modules/mqtt-ext/pom.xml b/modules/mqtt-ext/pom.xml
index 8de15e4d..7577e9f1 100644
--- a/modules/mqtt-ext/pom.xml
+++ b/modules/mqtt-ext/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/osgi-ext/osgi-karaf/pom.xml b/modules/osgi-ext/osgi-karaf/pom.xml
index 6aa8fb68..46da530b 100644
--- a/modules/osgi-ext/osgi-karaf/pom.xml
+++ b/modules/osgi-ext/osgi-karaf/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/osgi-ext/osgi/pom.xml b/modules/osgi-ext/osgi/pom.xml
index 420b056b..ea6a982f 100644
--- a/modules/osgi-ext/osgi/pom.xml
+++ b/modules/osgi-ext/osgi/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/osgi-ext/osgi/src/main/java/org/apache/ignite/osgi/classloaders/BundleDelegatingClassLoader.java b/modules/osgi-ext/osgi/src/main/java/org/apache/ignite/osgi/classloaders/BundleDelegatingClassLoader.java
index 36f18566..3558ea7f 100644
--- a/modules/osgi-ext/osgi/src/main/java/org/apache/ignite/osgi/classloaders/BundleDelegatingClassLoader.java
+++ b/modules/osgi-ext/osgi/src/main/java/org/apache/ignite/osgi/classloaders/BundleDelegatingClassLoader.java
@@ -63,12 +63,12 @@ public class BundleDelegatingClassLoader extends ClassLoader {
 
     /** {@inheritDoc} */
     @Override protected URL findResource(String name) {
-        URL resource = bundle.getResource(name);
+        URL rsrc = bundle.getResource(name);
 
-        if (resource == null && clsLdr != null)
-            resource = clsLdr.getResource(name);
+        if (rsrc == null && clsLdr != null)
+            rsrc = clsLdr.getResource(name);
 
-        return resource;
+        return rsrc;
     }
 
     /** {@inheritDoc} */
diff --git a/modules/osgi-ext/osgi/src/test/java/org/apache/ignite/osgi/activators/BasicIgniteTestActivator.java b/modules/osgi-ext/osgi/src/test/java/org/apache/ignite/osgi/activators/BasicIgniteTestActivator.java
index b43a2f61..37d0e1ae 100644
--- a/modules/osgi-ext/osgi/src/test/java/org/apache/ignite/osgi/activators/BasicIgniteTestActivator.java
+++ b/modules/osgi-ext/osgi/src/test/java/org/apache/ignite/osgi/activators/BasicIgniteTestActivator.java
@@ -35,11 +35,11 @@ public class BasicIgniteTestActivator extends IgniteAbstractOsgiContextActivator
      * @return Ignite config.
      */
     @Override public IgniteConfiguration igniteConfiguration() {
-        IgniteConfiguration config = new IgniteConfiguration();
+        IgniteConfiguration cfg = new IgniteConfiguration();
 
-        config.setIgniteInstanceName("testGrid");
+        cfg.setIgniteInstanceName("testGrid");
 
-        return config;
+        return cfg;
     }
 
     /**
diff --git a/modules/performance-statistics-ext/src/main/java/org/apache/ignite/internal/performancestatistics/PerformanceStatisticsReportBuilder.java b/modules/performance-statistics-ext/src/main/java/org/apache/ignite/internal/performancestatistics/PerformanceStatisticsReportBuilder.java
index 2296bdcc..1560ed52 100644
--- a/modules/performance-statistics-ext/src/main/java/org/apache/ignite/internal/performancestatistics/PerformanceStatisticsReportBuilder.java
+++ b/modules/performance-statistics-ext/src/main/java/org/apache/ignite/internal/performancestatistics/PerformanceStatisticsReportBuilder.java
@@ -125,8 +125,8 @@ public class PerformanceStatisticsReportBuilder {
 
         ObjectNode dataJson = MAPPER.createObjectNode();
 
-        for (IgnitePerformanceStatisticsHandler handler : handlers)
-            handler.results().forEach(dataJson::set);
+        for (IgnitePerformanceStatisticsHandler hnd : handlers)
+            hnd.results().forEach(dataJson::set);
 
         writeJsonToFile(resDir + "/data/data.json", dataJson);
 
@@ -210,14 +210,14 @@ public class PerformanceStatisticsReportBuilder {
                 ZipEntry entry;
 
                 while ((entry = zip.getNextEntry()) != null) {
-                    File entryDestination = new File(resDir, entry.getName());
+                    File entryDest = new File(resDir, entry.getName());
 
                     if (entry.isDirectory())
-                        entryDestination.mkdirs();
+                        entryDest.mkdirs();
                     else {
-                        entryDestination.getParentFile().mkdirs();
+                        entryDest.getParentFile().mkdirs();
 
-                        try (OutputStream out = new FileOutputStream(entryDestination)) {
+                        try (OutputStream out = new FileOutputStream(entryDest)) {
                             IOUtils.copy(zip, out);
                         }
                     }
diff --git a/modules/performance-statistics-ext/src/test/java/org/apache/ignite/internal/performancestatistics/PerformanceStatisticsReportSelfTest.java b/modules/performance-statistics-ext/src/test/java/org/apache/ignite/internal/performancestatistics/PerformanceStatisticsReportSelfTest.java
index d2143418..770c7239 100644
--- a/modules/performance-statistics-ext/src/test/java/org/apache/ignite/internal/performancestatistics/PerformanceStatisticsReportSelfTest.java
+++ b/modules/performance-statistics-ext/src/test/java/org/apache/ignite/internal/performancestatistics/PerformanceStatisticsReportSelfTest.java
@@ -126,11 +126,11 @@ public class PerformanceStatisticsReportSelfTest {
 
             File report = reportDir[0];
 
-            File index = new File(report.getAbsolutePath() + File.separatorChar + "index.html");
+            File idx = new File(report.getAbsolutePath() + File.separatorChar + "index.html");
             File dataDir = new File(report.getAbsolutePath() + File.separatorChar + "data");
             File dataJs = new File(dataDir.getAbsolutePath() + File.separatorChar + "data.json.js");
 
-            assertTrue(index.exists());
+            assertTrue(idx.exists());
             assertTrue(dataDir.exists());
             assertTrue(dataJs.exists());
         }
diff --git a/modules/pub-sub-ext/pom.xml b/modules/pub-sub-ext/pom.xml
index 7591a862..1f3e594f 100644
--- a/modules/pub-sub-ext/pom.xml
+++ b/modules/pub-sub-ext/pom.xml
@@ -91,4 +91,4 @@
             </plugin>
         </plugins>
     </build>
-</project>
\ No newline at end of file
+</project>
diff --git a/modules/pub-sub-ext/src/main/java/org/apache/ignite/stream/pubsub/PubSubStreamer.java b/modules/pub-sub-ext/src/main/java/org/apache/ignite/stream/pubsub/PubSubStreamer.java
index b626b411..cc8edf53 100644
--- a/modules/pub-sub-ext/src/main/java/org/apache/ignite/stream/pubsub/PubSubStreamer.java
+++ b/modules/pub-sub-ext/src/main/java/org/apache/ignite/stream/pubsub/PubSubStreamer.java
@@ -227,27 +227,27 @@ public class PubSubStreamer<K, V> extends StreamAdapter<PubsubMessage, K, V> {
         @Override public Void call() throws Exception {
             try {
                 while (!stopped) {
-                    PullRequest pullRequest =
+                    PullRequest pullReq =
                             PullRequest.newBuilder()
                                        .setMaxMessages(maxMessages)
                                        .setReturnImmediately(returnImmediately) // return immediately if messages are not available
                                        .setSubscription(subscriptionName)
                                        .build();
 
-                    PullResponse pullResponse = subscriberStub.pullCallable().call(pullRequest);
+                    PullResponse pullRes = subscriberStub.pullCallable().call(pullReq);
 
                     List<String> ackIds = new ArrayList<>();
-                    for (ReceivedMessage message : pullResponse.getReceivedMessagesList()) {
-                        addMessage(message.getMessage());
-                        ackIds.add(message.getAckId());
+                    for (ReceivedMessage msg : pullRes.getReceivedMessagesList()) {
+                        addMessage(msg.getMessage());
+                        ackIds.add(msg.getAckId());
                     }
 
-                    AcknowledgeRequest acknowledgeRequest = AcknowledgeRequest.newBuilder()
+                    AcknowledgeRequest acknowledgeReq = AcknowledgeRequest.newBuilder()
                                                                               .setSubscription(subscriptionName)
                                                                               .addAllAckIds(ackIds)
                                                                               .build();
 
-                    subscriberStub.acknowledgeCallable().call(acknowledgeRequest);
+                    subscriberStub.acknowledgeCallable().call(acknowledgeReq);
                 }
             }
             finally {
diff --git a/modules/pub-sub-ext/src/test/java/org/apache/ignite/stream/pubsub/MockPubSubServer.java b/modules/pub-sub-ext/src/test/java/org/apache/ignite/stream/pubsub/MockPubSubServer.java
index 8026a29d..d024913d 100644
--- a/modules/pub-sub-ext/src/test/java/org/apache/ignite/stream/pubsub/MockPubSubServer.java
+++ b/modules/pub-sub-ext/src/test/java/org/apache/ignite/stream/pubsub/MockPubSubServer.java
@@ -115,10 +115,10 @@ class MockPubSubServer {
     private ClientCall<AcknowledgeRequest, Empty> acknowledgeCall() {
         ClientCall<AcknowledgeRequest, Empty> clientCall = Mockito.mock(ClientCall.class);
         doAnswer(iom -> {
-                Object[] arguments = iom.getArguments();
-                ClientCall.Listener<Empty> listener = (ClientCall.Listener<Empty>)arguments[0];
+                Object[] args = iom.getArguments();
+                ClientCall.Listener<Empty> listener = (ClientCall.Listener<Empty>)args[0];
                 listener.onMessage(Empty.getDefaultInstance());
-                Metadata metadata = (Metadata)arguments[1];
+                Metadata metadata = (Metadata)args[1];
                 listener.onClose(Status.OK, metadata);
                 return null;
             }
@@ -132,9 +132,9 @@ class MockPubSubServer {
 
         doAnswer(
             iom -> {
-                Object[] arguments = iom.getArguments();
-                ClientCall.Listener<PullResponse> listener = (ClientCall.Listener<PullResponse>)arguments[0];
-                Metadata metadata = (Metadata)arguments[1];
+                Object[] args = iom.getArguments();
+                ClientCall.Listener<PullResponse> listener = (ClientCall.Listener<PullResponse>)args[0];
+                Metadata metadata = (Metadata)args[1];
                 pullMessages(listener, metadata);
                 return null;
             }
@@ -144,7 +144,7 @@ class MockPubSubServer {
 
     /** */
     private void pullMessages(ClientCall.Listener<PullResponse> listener, Metadata metadata) {
-        PullResponse.Builder pullResponse = PullResponse.newBuilder();
+        PullResponse.Builder pullRes = PullResponse.newBuilder();
 
         try {
             for (int i = 0; i < MESSAGES_PER_REQUEST; i++) {
@@ -153,14 +153,14 @@ class MockPubSubServer {
                 if (msg == null)
                     break;
 
-                pullResponse.addReceivedMessages(ReceivedMessage.newBuilder().mergeMessage(msg).build());
+                pullRes.addReceivedMessages(ReceivedMessage.newBuilder().mergeMessage(msg).build());
             }
         }
         catch (InterruptedException e) {
             Thread.currentThread().interrupt();
         }
 
-        listener.onMessage(pullResponse.build());
+        listener.onMessage(pullRes.build());
         listener.onClose(Status.OK, metadata);
     }
 
@@ -180,8 +180,8 @@ class MockPubSubServer {
 
         when(publisher.publish(any(PubsubMessage.class))).thenAnswer(
             (iom) -> {
-                PubsubMessage pubsubMessage = (PubsubMessage)iom.getArguments()[0];
-                blockingQueue.add(pubsubMessage);
+                PubsubMessage pubsubMsg = (PubsubMessage)iom.getArguments()[0];
+                blockingQueue.add(pubsubMsg);
                 return ApiFutures.immediateFuture(UUID.randomUUID().toString());
             }
         );
diff --git a/modules/pub-sub-ext/src/test/java/org/apache/ignite/stream/pubsub/PubSubStreamerSelfTest.java b/modules/pub-sub-ext/src/test/java/org/apache/ignite/stream/pubsub/PubSubStreamerSelfTest.java
index e0361bee..4608e5f1 100644
--- a/modules/pub-sub-ext/src/test/java/org/apache/ignite/stream/pubsub/PubSubStreamerSelfTest.java
+++ b/modules/pub-sub-ext/src/test/java/org/apache/ignite/stream/pubsub/PubSubStreamerSelfTest.java
@@ -234,7 +234,7 @@ public class PubSubStreamerSelfTest {
 
         Collections.shuffle(subnet);
 
-        List<PubsubMessage> messages = new ArrayList<>();
+        List<PubsubMessage> pubMsg = new ArrayList<>();
 
         Map<String, String> keyValMap = new HashMap<>();
 
@@ -245,18 +245,18 @@ public class PubSubStreamerSelfTest {
 
             String msg = runtime + VALUE_URL + ip;
 
-            JsonObject jsonObject = new JsonObject();
-            jsonObject.addProperty(JSON_KEY, ip);
-            jsonObject.addProperty(JSON_VALUE, msg);
+            JsonObject jsonObj = new JsonObject();
+            jsonObj.addProperty(JSON_KEY, ip);
+            jsonObj.addProperty(JSON_VALUE, msg);
 
-            ByteString byteString = ByteString.copyFrom(jsonObject.toString(), Charset.defaultCharset());
+            ByteString byteStr = ByteString.copyFrom(jsonObj.toString(), Charset.defaultCharset());
 
-            PubsubMessage pubsubMessage = PubsubMessage.newBuilder()
-                                                       .setData(byteString)
+            PubsubMessage pubsubMsg = PubsubMessage.newBuilder()
+                                                       .setData(byteStr)
                                                        .build();
 
-            messages.add(pubsubMessage);
-            String messageId = mockPubSubServer.getPublisher(TOPIC_NAME).publish(pubsubMessage).get();
+            pubMsg.add(pubsubMsg);
+            String msgId = mockPubSubServer.getPublisher(TOPIC_NAME).publish(pubsubMsg).get();
             keyValMap.put(ip, msg);
 
         }
@@ -272,8 +272,8 @@ public class PubSubStreamerSelfTest {
             @Override public Map.Entry<String, String> extract(PubsubMessage msg) {
                 String dataStr = msg.getData().toStringUtf8();
                 JsonElement jsonElement = new JsonParser().parse(dataStr).getAsJsonObject();
-                JsonObject jsonObject = jsonElement.getAsJsonObject();
-                return new GridMapEntry<>(jsonObject.get(JSON_KEY).getAsString(), jsonObject.get(JSON_VALUE).getAsString());
+                JsonObject jsonObj = jsonElement.getAsJsonObject();
+                return new GridMapEntry<>(jsonObj.get(JSON_KEY).getAsString(), jsonObj.get(JSON_VALUE).getAsString());
             }
         };
     }
@@ -286,16 +286,16 @@ public class PubSubStreamerSelfTest {
             @Override public Map<String, String> extract(PubsubMessage msg) {
                 String dataStr = msg.getData().toStringUtf8();
                 JsonElement jsonElement = new JsonParser().parse(dataStr).getAsJsonObject();
-                JsonArray jsonArray = jsonElement.getAsJsonArray();
+                JsonArray jsonArr = jsonElement.getAsJsonArray();
 
                 final Map<String, String> answer = new HashMap<>();
 
-                for (int i = 0; i < jsonArray.size(); i++) {
-                    JsonObject jsonObject = jsonArray.get(i).getAsJsonObject();
-                    String key = jsonObject.get(JSON_KEY).getAsString();
-                    String value = jsonObject.get(JSON_VALUE).getAsString();
+                for (int i = 0; i < jsonArr.size(); i++) {
+                    JsonObject jsonObj = jsonArr.get(i).getAsJsonObject();
+                    String key = jsonObj.get(JSON_KEY).getAsString();
+                    String val = jsonObj.get(JSON_VALUE).getAsString();
 
-                    answer.put(key, value);
+                    answer.put(key, val);
                 }
 
                 return answer;
diff --git a/modules/rocketmq-ext/src/test/java/org/apache/ignite/stream/rocketmq/RocketMQStreamerTest.java b/modules/rocketmq-ext/src/test/java/org/apache/ignite/stream/rocketmq/RocketMQStreamerTest.java
index 534f8d4d..4a9b86ee 100644
--- a/modules/rocketmq-ext/src/test/java/org/apache/ignite/stream/rocketmq/RocketMQStreamerTest.java
+++ b/modules/rocketmq-ext/src/test/java/org/apache/ignite/stream/rocketmq/RocketMQStreamerTest.java
@@ -194,22 +194,22 @@ public class RocketMQStreamerTest extends GridCommonAbstractTest {
      * @throws IgniteInterruptedCheckedException If fails.
      */
     private void initTopic(String topic, String nsAddr) throws Exception {
-        DefaultMQAdminExt defaultMQAdminExt = new DefaultMQAdminExt();
-        defaultMQAdminExt.setNamesrvAddr(nsAddr);
+        DefaultMQAdminExt dfltMQAdminExt = new DefaultMQAdminExt();
+        dfltMQAdminExt.setNamesrvAddr(nsAddr);
         try {
-            defaultMQAdminExt.start();
+            dfltMQAdminExt.start();
 
-            TopicConfig topicConfig = new TopicConfig();
-            topicConfig.setTopicName(topic);
-            topicConfig.setReadQueueNums(4);
-            topicConfig.setWriteQueueNums(4);
+            TopicConfig topicCfg = new TopicConfig();
+            topicCfg.setTopicName(topic);
+            topicCfg.setReadQueueNums(4);
+            topicCfg.setWriteQueueNums(4);
 
-            defaultMQAdminExt.createAndUpdateTopicConfig(testRocketMQServer.getBrokerAddr(), topicConfig);
+            dfltMQAdminExt.createAndUpdateTopicConfig(testRocketMQServer.getBrokerAddr(), topicCfg);
 
             U.sleep(100);
         }
         finally {
-            defaultMQAdminExt.shutdown();
+            dfltMQAdminExt.shutdown();
         }
     }
 }
diff --git a/modules/rocketmq-ext/src/test/java/org/apache/ignite/stream/rocketmq/TestRocketMQServer.java b/modules/rocketmq-ext/src/test/java/org/apache/ignite/stream/rocketmq/TestRocketMQServer.java
index beece8ef..39a8add9 100644
--- a/modules/rocketmq-ext/src/test/java/org/apache/ignite/stream/rocketmq/TestRocketMQServer.java
+++ b/modules/rocketmq-ext/src/test/java/org/apache/ignite/stream/rocketmq/TestRocketMQServer.java
@@ -83,13 +83,13 @@ class TestRocketMQServer {
      * @throws Exception If fails.
      */
     private void startNameServer() throws Exception {
-        NamesrvConfig namesrvConfig = new NamesrvConfig();
-        NettyServerConfig nameServerNettyServerConfig = new NettyServerConfig();
+        NamesrvConfig nameSrvCfg = new NamesrvConfig();
+        NettyServerConfig nameServerNettyServerCfg = new NettyServerConfig();
 
-        namesrvConfig.setKvConfigPath(System.getProperty("java.io.tmpdir") + separator + "namesrv" + separator + "kvConfig.json");
-        nameServerNettyServerConfig.setListenPort(NAME_SERVER_PORT);
+        nameSrvCfg.setKvConfigPath(System.getProperty("java.io.tmpdir") + separator + "namesrv" + separator + "kvConfig.json");
+        nameServerNettyServerCfg.setListenPort(NAME_SERVER_PORT);
 
-        nameSrv = new NamesrvController(namesrvConfig, nameServerNettyServerConfig);
+        nameSrv = new NamesrvController(nameSrvCfg, nameServerNettyServerCfg);
 
         nameSrv.initialize();
         nameSrv.start();
diff --git a/modules/spark-ext/examples/src/main/java/org/apache/ignite/examples/spark/JavaIgniteCatalogExample.java b/modules/spark-ext/examples/src/main/java/org/apache/ignite/examples/spark/JavaIgniteCatalogExample.java
index e04ea0a6..1867eafe 100644
--- a/modules/spark-ext/examples/src/main/java/org/apache/ignite/examples/spark/JavaIgniteCatalogExample.java
+++ b/modules/spark-ext/examples/src/main/java/org/apache/ignite/examples/spark/JavaIgniteCatalogExample.java
@@ -51,7 +51,7 @@ public class JavaIgniteCatalogExample {
         setupServerAndData();
 
         //Creating Ignite-specific implementation of Spark session.
-        IgniteSparkSession igniteSession = IgniteSparkSession.builder()
+        IgniteSparkSession igniteSes = IgniteSparkSession.builder()
                 .appName("Spark Ignite catalog example")
                 .master("local")
                 .config("spark.executor.instances", "2")
@@ -65,22 +65,22 @@ public class JavaIgniteCatalogExample {
         System.out.println("List of available tables:");
 
         //Showing existing tables.
-        igniteSession.catalog().listTables().show();
+        igniteSes.catalog().listTables().show();
 
         System.out.println("PERSON table description:");
 
         //Showing `person` schema.
-        igniteSession.catalog().listColumns("person").show();
+        igniteSes.catalog().listColumns("person").show();
 
         System.out.println("CITY table description:");
 
         //Showing `city` schema.
-        igniteSession.catalog().listColumns("city").show();
+        igniteSes.catalog().listColumns("city").show();
 
         println("Querying all persons from city with ID=2.");
 
         //Selecting data through Spark SQL engine.
-        Dataset<Row> df = igniteSession.sql("SELECT * FROM person WHERE CITY_ID = 2");
+        Dataset<Row> df = igniteSes.sql("SELECT * FROM person WHERE CITY_ID = 2");
 
         System.out.println("Result schema:");
 
@@ -93,7 +93,7 @@ public class JavaIgniteCatalogExample {
         System.out.println("Querying all persons living in Denver.");
 
         //Selecting data through Spark SQL engine.
-        Dataset<Row> df2 = igniteSession.sql("SELECT * FROM person p JOIN city c ON c.ID = p.CITY_ID WHERE c.NAME = 'Denver'");
+        Dataset<Row> df2 = igniteSes.sql("SELECT * FROM person p JOIN city c ON c.ID = p.CITY_ID WHERE c.NAME = 'Denver'");
 
         System.out.println("Result schema:");
 
diff --git a/modules/spark-ext/examples/src/main/java/org/apache/ignite/examples/spark/SharedRDDExample.java b/modules/spark-ext/examples/src/main/java/org/apache/ignite/examples/spark/SharedRDDExample.java
index d7db573a..6b0af0bd 100644
--- a/modules/spark-ext/examples/src/main/java/org/apache/ignite/examples/spark/SharedRDDExample.java
+++ b/modules/spark-ext/examples/src/main/java/org/apache/ignite/examples/spark/SharedRDDExample.java
@@ -56,18 +56,18 @@ public class SharedRDDExample {
             .set("spark.executor.instances", "2");
 
         // Spark context.
-        JavaSparkContext sparkContext = new JavaSparkContext(sparkConf);
+        JavaSparkContext sparkCtx = new JavaSparkContext(sparkConf);
 
         // Adjust the logger to exclude the logs of no interest.
         Configurator.setRootLevel(Level.ERROR);
         Configurator.setLevel("org.apache.ignite", Level.INFO);
 
         // Creates Ignite context with specific configuration and runs Ignite in the embedded mode.
-        JavaIgniteContext<Integer, Integer> igniteContext = new JavaIgniteContext<Integer, Integer>(
-            sparkContext, "config/spark/example-shared-rdd.xml", false);
+        JavaIgniteContext<Integer, Integer> igniteCtx = new JavaIgniteContext<Integer, Integer>(
+            sparkCtx, "config/spark/example-shared-rdd.xml", false);
 
         // Create a Java Ignite RDD of Type (Int,Int) Integer Pair.
-        JavaIgniteRDD<Integer, Integer> sharedRDD = igniteContext.<Integer, Integer>fromCache("sharedRDD");
+        JavaIgniteRDD<Integer, Integer> sharedRDD = igniteCtx.<Integer, Integer>fromCache("sharedRDD");
 
         // Define data to be stored in the Ignite RDD (cache).
         List<Integer> data = new ArrayList<>(20);
@@ -77,7 +77,7 @@ public class SharedRDDExample {
         }
 
         // Preparing a Java RDD.
-        JavaRDD<Integer> javaRDD = sparkContext.<Integer>parallelize(data);
+        JavaRDD<Integer> javaRDD = sparkCtx.<Integer>parallelize(data);
 
         // Fill the Ignite RDD in with Int pairs. Here Pairs are represented as Scala Tuple2.
         sharedRDD.savePairs(javaRDD.<Integer, Integer>mapToPair(new PairFunction<Integer, Integer, Integer>() {
@@ -121,6 +121,6 @@ public class SharedRDDExample {
         df.show();
 
         // Close IgniteContext on all the workers.
-        igniteContext.close(true);
+        igniteCtx.close(true);
     }
 }
diff --git a/modules/spark-ext/spark/pom.xml b/modules/spark-ext/spark/pom.xml
index 26fe59b0..cca080f9 100644
--- a/modules/spark-ext/spark/pom.xml
+++ b/modules/spark-ext/spark/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/spring-boot-autoconfigure-ext/spring-boot-autoconfigure/pom.xml b/modules/spring-boot-autoconfigure-ext/spring-boot-autoconfigure/pom.xml
index 58b670cc..29c26065 100644
--- a/modules/spring-boot-autoconfigure-ext/spring-boot-autoconfigure/pom.xml
+++ b/modules/spring-boot-autoconfigure-ext/spring-boot-autoconfigure/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/spring-cache-ext/pom.xml b/modules/spring-cache-ext/pom.xml
index 5130764c..47091fc4 100644
--- a/modules/spring-cache-ext/pom.xml
+++ b/modules/spring-cache-ext/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/spring-cache-ext/src/test/java/org/apache/ignite/cache/spring/GridSpringCacheManagerMultiJvmSelfTest.java b/modules/spring-cache-ext/src/test/java/org/apache/ignite/cache/spring/GridSpringCacheManagerMultiJvmSelfTest.java
index 2bc78ce7..3eb08546 100644
--- a/modules/spring-cache-ext/src/test/java/org/apache/ignite/cache/spring/GridSpringCacheManagerMultiJvmSelfTest.java
+++ b/modules/spring-cache-ext/src/test/java/org/apache/ignite/cache/spring/GridSpringCacheManagerMultiJvmSelfTest.java
@@ -117,8 +117,8 @@ public class GridSpringCacheManagerMultiJvmSelfTest extends GridCommonAbstractTe
 
         int totalCalledCnt = 0;
 
-        for (IgniteInternalFuture<Integer> future : futures)
-            totalCalledCnt += future.get();
+        for (IgniteInternalFuture<Integer> fut : futures)
+            totalCalledCnt += fut.get();
 
         IgniteCache<Object, Object> cache = loc.cache("dynamicCache");
 
diff --git a/modules/spring-cache-ext/src/test/java/org/apache/ignite/cache/spring/SpringCacheTest.java b/modules/spring-cache-ext/src/test/java/org/apache/ignite/cache/spring/SpringCacheTest.java
index 3e4c228d..ba71c2e9 100644
--- a/modules/spring-cache-ext/src/test/java/org/apache/ignite/cache/spring/SpringCacheTest.java
+++ b/modules/spring-cache-ext/src/test/java/org/apache/ignite/cache/spring/SpringCacheTest.java
@@ -91,10 +91,10 @@ public class SpringCacheTest extends GridCommonAbstractTest {
     @Test
     public void testGetByKey() throws Exception {
         String key = "key";
-        String value = "value";
+        String val = "value";
 
-        springCache.put(key, value);
-        assertEquals(value, springCache.get(key).get());
+        springCache.put(key, val);
+        assertEquals(val, springCache.get(key).get());
 
         assertNull(springCache.get("wrongKey"));
     }
@@ -105,10 +105,10 @@ public class SpringCacheTest extends GridCommonAbstractTest {
     @Test
     public void testGetByKeyType() throws Exception {
         String key = "key";
-        String value = "value";
+        String val = "value";
 
-        springCache.put(key, value);
-        assertEquals(value, springCache.get(key, String.class));
+        springCache.put(key, val);
+        assertEquals(val, springCache.get(key, String.class));
 
         try {
             springCache.get(key, Integer.class);
@@ -127,10 +127,10 @@ public class SpringCacheTest extends GridCommonAbstractTest {
         String key = "key";
         assertNull(springCache.get(key));
 
-        String value = "value";
-        springCache.put(key, value);
+        String val = "value";
+        springCache.put(key, val);
 
-        assertEquals(value, springCache.get(key).get());
+        assertEquals(val, springCache.get(key).get());
     }
 
     /**
diff --git a/modules/spring-data-ext/spring-data/pom.xml b/modules/spring-data-ext/spring-data/pom.xml
index 178847cf..c98ebfa8 100644
--- a/modules/spring-data-ext/spring-data/pom.xml
+++ b/modules/spring-data-ext/spring-data/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/config/DynamicQueryConfig.java b/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/config/DynamicQueryConfig.java
index f5640807..f7e3e225 100644
--- a/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/config/DynamicQueryConfig.java
+++ b/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/config/DynamicQueryConfig.java
@@ -72,19 +72,19 @@ public class DynamicQueryConfig {
      * @return the dynamic query config
      */
     public static DynamicQueryConfig fromQueryAnnotation(Query queryConfiguration) {
-        DynamicQueryConfig config = new DynamicQueryConfig();
+        DynamicQueryConfig cfg = new DynamicQueryConfig();
         if (queryConfiguration != null) {
-            config.value = queryConfiguration.value();
-            config.collocated = queryConfiguration.collocated();
-            config.timeout = queryConfiguration.timeout();
-            config.enforceJoinOrder = queryConfiguration.enforceJoinOrder();
-            config.distributedJoins = queryConfiguration.distributedJoins();
-            config.lazy = queryConfiguration.lazy();
-            config.parts = queryConfiguration.parts();
-            config.local = queryConfiguration.local();
-            config.limit = queryConfiguration.limit();
+            cfg.value = queryConfiguration.value();
+            cfg.collocated = queryConfiguration.collocated();
+            cfg.timeout = queryConfiguration.timeout();
+            cfg.enforceJoinOrder = queryConfiguration.enforceJoinOrder();
+            cfg.distributedJoins = queryConfiguration.distributedJoins();
+            cfg.lazy = queryConfiguration.lazy();
+            cfg.parts = queryConfiguration.parts();
+            cfg.local = queryConfiguration.local();
+            cfg.limit = queryConfiguration.limit();
         }
-        return config;
+        return cfg;
     }
 
     /**
diff --git a/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/IgniteQueryGenerator.java b/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/IgniteQueryGenerator.java
index 3bcfbb7d..572bef31 100644
--- a/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/IgniteQueryGenerator.java
+++ b/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/IgniteQueryGenerator.java
@@ -53,7 +53,7 @@ public class IgniteQueryGenerator {
             parts = new PartTree(mtd.getName(), metadata.getIdType());
         }
 
-        boolean isCountOrFieldQuery = parts.isCountProjection();
+        boolean isCntOrFieldQry = parts.isCountProjection();
 
         StringBuilder sql = new StringBuilder();
 
@@ -61,7 +61,7 @@ public class IgniteQueryGenerator {
             sql.append("DELETE ");
 
             // For the DML queries aside from SELECT *, they should run over SqlFieldQuery
-            isCountOrFieldQuery = true;
+            isCntOrFieldQry = true;
         }
         else {
             sql.append("SELECT ");
@@ -69,7 +69,7 @@ public class IgniteQueryGenerator {
             if (parts.isDistinct())
                 throw new UnsupportedOperationException("DISTINCT clause in not supported.");
 
-            if (isCountOrFieldQuery)
+            if (isCntOrFieldQry)
                 sql.append("COUNT(1) ");
             else
                 sql.append("* ");
@@ -105,7 +105,7 @@ public class IgniteQueryGenerator {
 
         return new IgniteQuery(
             sql.toString(),
-            isCountOrFieldQuery,
+            isCntOrFieldQry,
             false,
             true,
             isParametersDependent(parts),
diff --git a/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/IgniteRepositoryQuery.java b/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/IgniteRepositoryQuery.java
index 02faf36d..0d6ff89d 100644
--- a/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/IgniteRepositoryQuery.java
+++ b/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/IgniteRepositoryQuery.java
@@ -311,38 +311,38 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
     }
 
     /**
-     * {@inheritDoc} @param values the values
+     * {@inheritDoc} @param val the val
      *
      * @return the object
      */
-    @Override public Object execute(Object[] values) {
-        Object[] parameters = values;
+    @Override public Object execute(Object[] val) {
+        Object[] parameters = val;
 
-        // config via Query annotation (dynamicQuery = false)
-        DynamicQueryConfig config = staticQueryConfiguration;
+        // cfg via Query annotation (dynamicQuery = false)
+        DynamicQueryConfig cfg = staticQueryConfiguration;
 
         // or condition to allow query tunning
-        if (config == null || dynamicQueryConfigurationIndex != -1) {
-            DynamicQueryConfig newConfig = (DynamicQueryConfig)values[dynamicQueryConfigurationIndex];
+        if (cfg == null || dynamicQueryConfigurationIndex != -1) {
+            DynamicQueryConfig newCfg = (DynamicQueryConfig)val[dynamicQueryConfigurationIndex];
             parameters = ArrayUtils.removeElement(parameters, dynamicQueryConfigurationIndex);
-            if (newConfig != null) {
+            if (newCfg != null) {
                 // upset query configuration
-                config = newConfig;
+                cfg = newCfg;
             }
         }
-        // query configuration is required, via Query annotation or per parameter (within provided values param)
-        if (config == null) {
+        // query configuration is required, via Query annotation or per parameter (within provided val param)
+        if (cfg == null) {
             throw new IllegalStateException(
                 "Unable to execute query. When passing dynamicQuery = true via org.apache.ignite.springdata"
-                    + ".repository.config.Query annotation, you must provide a non null method parameter of type "
+                    + ".repository.cfg.Query annotation, you must provide a non null method parameter of type "
                     + "DynamicQueryConfig");
         }
 
-        IgniteQuery qry = getQuery(config);
+        IgniteQuery qry = getQuery(cfg);
 
         ReturnStrategy returnStgy = getReturnStgy(qry);
 
-        Query iQry = prepareQuery(qry, config, returnStgy, parameters);
+        Query iQry = prepareQuery(qry, cfg, returnStgy, parameters);
 
         QueryCursor qryCursor;
 
@@ -372,23 +372,23 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
         Iterator<T> it = (Iterator<T>)method.getParameters().iterator();
         int i = 0;
         boolean found = false;
-        int index = -1;
+        int idx = -1;
         while (it.hasNext()) {
-            T parameter = it.next();
+            T param = it.next();
 
-            if (DynamicQueryConfig.class.isAssignableFrom(parameter.getType())) {
+            if (DynamicQueryConfig.class.isAssignableFrom(param.getType())) {
                 if (found) {
                     throw new IllegalStateException("Invalid '" + method.getName() + "' repository method signature. "
                         + "Only ONE DynamicQueryConfig parameter is allowed");
                 }
 
                 found = true;
-                index = i;
+                idx = i;
             }
 
             i++;
         }
-        return index;
+        return idx;
     }
 
     /**
@@ -438,21 +438,21 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
         if (!(genericReturnType instanceof ParameterizedType))
             return false;
 
-        Type[] actualTypeArguments = ((ParameterizedType)genericReturnType).getActualTypeArguments();
+        Type[] actualTypeArgs = ((ParameterizedType)genericReturnType).getActualTypeArguments();
 
-        if (actualTypeArguments.length == 0)
+        if (actualTypeArgs.length == 0)
             return false;
 
-        if (actualTypeArguments[0] instanceof ParameterizedType) {
-            ParameterizedType type = (ParameterizedType)actualTypeArguments[0];
+        if (actualTypeArgs[0] instanceof ParameterizedType) {
+            ParameterizedType type = (ParameterizedType)actualTypeArgs[0];
 
             Class<?> type1 = (Class)type.getRawType();
 
             return type1.isAssignableFrom(cls);
         }
 
-        if (actualTypeArguments[0] instanceof Class) {
-            Class typeArg = (Class)actualTypeArguments[0];
+        if (actualTypeArgs[0] instanceof Class) {
+            Class typeArg = (Class)actualTypeArgs[0];
 
             return typeArg.isAssignableFrom(cls);
         }
@@ -542,26 +542,26 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
         ReturnStrategy returnStgy,
         Object[] prmtrs,
         QueryCursor qryCursor) {
-        final Class<?> returnClass;
+        final Class<?> retCls;
 
         if (hasProjection) {
             if (hasDynamicProjection)
-                returnClass = (Class<?>)prmtrs[dynamicProjectionIndex];
+                retCls = (Class<?>)prmtrs[dynamicProjectionIndex];
             else
-                returnClass = returnedDomainClass;
+                retCls = returnedDomainClass;
         }
         else
-            returnClass = returnedDomainClass;
+            retCls = returnedDomainClass;
 
         if (qry.isFieldQuery()) {
             // take control over single primite result from queries, i.e. DELETE, SELECT COUNT, UPDATE ...
-            boolean singlePrimitiveResult = isPrimitiveOrWrapper(returnClass);
+            boolean singlePrimitiveResult = isPrimitiveOrWrapper(retCls);
 
             FieldsQueryCursor<?> fieldQryCur = (FieldsQueryCursor<?>)qryCursor;
 
             Function<List<?>, ?> cWrapperTransformFunction = null;
 
-            if (type.equals(returnClass))
+            if (type.equals(retCls))
                 cWrapperTransformFunction = row -> rowToEntity(row, fieldQryCur);
             else {
                 if (hasProjection || singlePrimitiveResult) {
@@ -570,7 +570,7 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
                     else {
                         // Map row -> projection class
                         cWrapperTransformFunction = row -> factory
-                            .createProjection(returnClass, rowToMap(row, fieldQryCur));
+                            .createProjection(retCls, rowToMap(row, fieldQryCur));
                     }
                 }
                 else
@@ -608,8 +608,8 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
         else {
             Function<Cache.Entry<?, ?>, ?> cWrapperTransformFunction;
 
-            if (hasProjection && !type.equals(returnClass))
-                cWrapperTransformFunction = row -> factory.createProjection(returnClass, row.getValue());
+            if (hasProjection && !type.equals(retCls))
+                cWrapperTransformFunction = row -> factory.createProjection(retCls, row.getValue());
             else
                 cWrapperTransformFunction = Cache.Entry::getValue;
 
@@ -672,10 +672,10 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
         HashMap<String, Integer> methodParams = new HashMap<>();
 
         // create an evaluation context for custom query
-        EvaluationContext queryEvalContext = queryMethodEvaluationContextProvider
+        EvaluationContext qryEvalCtx = queryMethodEvaluationContextProvider
             .getEvaluationContext(queryMethodParams, values);
 
-        // By default queryEvalContext:
+        // By default qryEvalCtx:
         // - make accesible query method parameters by index:
         // @Query("select u from User u where u.age = ?#{[0]}")
         // List<User> findUsersByAge(int age);
@@ -699,7 +699,7 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
 
             if (p.isExpression()) {
                 // Evaluate SpEl expressions (synthetic parameter value) , example ?#{#customer.firstname}
-                newValues[i] = expressionParser.parseExpression(p.getExpression()).getValue(queryEvalContext);
+                newValues[i] = expressionParser.parseExpression(p.getExpression()).getValue(qryEvalCtx);
             }
             else {
                 // Extract parameter value by name or position respectively from invoking values
@@ -721,9 +721,9 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
     private Query prepareQuery(IgniteQuery qry, DynamicQueryConfig config, ReturnStrategy returnStgy, Object[] values) {
         Object[] parameters = values;
 
-        String queryString = qry.qryStr();
+        String qryStr = qry.qryStr();
 
-        Query query;
+        Query gry;
 
         checkRequiredPageable(returnStgy, values);
 
@@ -731,8 +731,8 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
             boolean isParamDependent;
 
             if (!qry.isAutogenerated()) {
-                StringQuery squery = new ExpressionBasedStringQuery(queryString, metadata, expressionParser);
-                queryString = squery.getQueryString();
+                StringQuery squery = new ExpressionBasedStringQuery(qryStr, metadata, expressionParser);
+                qryStr = squery.getQueryString();
                 parameters = extractBindableValues(parameters, getQueryMethod().getParameters(),
                     squery.getParameterBindings());
 
@@ -748,15 +748,15 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
 
             switch (qry.options()) {
                 case SORTING:
-                    queryString = IgniteQueryGenerator
-                        .addSorting(new StringBuilder(queryString), (Sort)values[values.length - 1])
+                    qryStr = IgniteQueryGenerator
+                        .addSorting(new StringBuilder(qryStr), (Sort)values[values.length - 1])
                         .toString();
                     if (qry.isAutogenerated())
                         parameters = Arrays.copyOfRange(parameters, 0, values.length - 1);
                     break;
                 case PAGINATION:
-                    queryString = IgniteQueryGenerator
-                        .addPaging(new StringBuilder(queryString), (Pageable)values[values.length - 1])
+                    qryStr = IgniteQueryGenerator
+                        .addPaging(new StringBuilder(qryStr), (Pageable)values[values.length - 1])
                         .toString();
                     if (qry.isAutogenerated())
                         parameters = Arrays.copyOfRange(parameters, 0, values.length - 1);
@@ -766,17 +766,17 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
 
             if (isParamDependent) {
                 T2<String, Object[]> parseRes = ParameterBindingParser.INSTANCE.processParameterDependentClauses(
-                    queryString,
+                    qryStr,
                     parameters
                 );
 
-                queryString = parseRes.get1();
+                qryStr = parseRes.get1();
 
                 parameters = parseRes.get2();
             }
 
             if (qry.isFieldQuery()) {
-                SqlFieldsQuery sqlFieldsQry = new SqlFieldsQuery(queryString);
+                SqlFieldsQuery sqlFieldsQry = new SqlFieldsQuery(qryStr);
                 sqlFieldsQry.setArgs(parameters);
 
                 sqlFieldsQry.setCollocated(config.collocated());
@@ -790,10 +790,10 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
 
                 sqlFieldsQry.setTimeout(config.timeout(), TimeUnit.MILLISECONDS);
 
-                query = sqlFieldsQry;
+                gry = sqlFieldsQry;
             }
             else {
-                SqlQuery sqlQry = new SqlQuery(type, queryString);
+                SqlQuery sqlQry = new SqlQuery(type, qryStr);
                 sqlQry.setArgs(parameters);
 
                 sqlQry.setDistributedJoins(config.distributedJoins());
@@ -804,7 +804,7 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
 
                 sqlQry.setTimeout(config.timeout(), TimeUnit.MILLISECONDS);
 
-                query = sqlQry;
+                gry = sqlQry;
             }
         }
         else {
@@ -816,34 +816,34 @@ public class IgniteRepositoryQuery implements RepositoryQuery {
                     break;
             }
 
-            // check if queryString contains SpEL template expressions and evaluate them if any
-            if (queryString.contains("#{")) {
-                EvaluationContext queryEvalContext = queryMethodEvaluationContextProvider
+            // check if qryStr contains SpEL template expressions and evaluate them if any
+            if (qryStr.contains("#{")) {
+                EvaluationContext qryEvalCtx = queryMethodEvaluationContextProvider
                     .getEvaluationContext(getQueryMethod().getParameters(),
                         values);
 
-                Object eval = expressionParser.parseExpression(queryString, ParserContext.TEMPLATE_EXPRESSION)
-                    .getValue(queryEvalContext);
+                Object eval = expressionParser.parseExpression(qryStr, ParserContext.TEMPLATE_EXPRESSION)
+                    .getValue(qryEvalCtx);
 
                 if (!(eval instanceof String)) {
                     throw new IllegalStateException(
                         "TextQuery with SpEL expressions must produce a String response, but found " + eval.getClass()
                             .getName()
-                            + ". Please, check your expression: " + queryString);
+                            + ". Please, check your expression: " + qryStr);
                 }
-                queryString = (String)eval;
+                qryStr = (String)eval;
             }
 
-            TextQuery textQuery = new TextQuery(type, queryString, config.limit());
+            TextQuery textQry = new TextQuery(type, qryStr, config.limit());
 
-            textQuery.setLocal(config.local());
+            textQry.setLocal(config.local());
 
             if (pageSize > -1)
-                textQuery.setPageSize(pageSize);
+                textQry.setPageSize(pageSize);
 
-            query = textQuery;
+            gry = textQry;
         }
-        return query;
+        return gry;
     }
 
     /**
diff --git a/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/QueryUtils.java b/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/QueryUtils.java
index 1457b5a1..e1b28614 100644
--- a/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/QueryUtils.java
+++ b/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/QueryUtils.java
@@ -271,7 +271,7 @@ public abstract class QueryUtils {
         Assert.hasText(originalQry, "OriginalQuery must not be null or empty!");
 
         Matcher matcher = COUNT_MATCH.matcher(originalQry);
-        String countQuery;
+        String cntQry;
 
         if (cntProjection == null) {
             String variable = matcher.matches() ? matcher.group(VARIABLE_NAME_GROUP_INDEX) : null;
@@ -279,12 +279,12 @@ public abstract class QueryUtils {
                 && !variable.startsWith("count(") && !variable.contains(",");
 
             String replacement = useVariable ? SIMPLE_COUNT_VALUE : COMPLEX_COUNT_VALUE;
-            countQuery = matcher.replaceFirst(String.format(COUNT_REPLACEMENT_TEMPLATE, replacement));
+            cntQry = matcher.replaceFirst(String.format(COUNT_REPLACEMENT_TEMPLATE, replacement));
         }
         else
-            countQuery = matcher.replaceFirst(String.format(COUNT_REPLACEMENT_TEMPLATE, cntProjection));
+            cntQry = matcher.replaceFirst(String.format(COUNT_REPLACEMENT_TEMPLATE, cntProjection));
 
-        return countQuery.replaceFirst(ORDER_BY_PART, "");
+        return cntQry.replaceFirst(ORDER_BY_PART, "");
     }
 
     /**
diff --git a/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/StringQuery.java b/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/StringQuery.java
index b83ad81a..20ba53e3 100644
--- a/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/StringQuery.java
+++ b/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/query/StringQuery.java
@@ -85,12 +85,12 @@ class StringQuery implements DeclaredQuery {
         bindings = new ArrayList<>();
         containsPageableInSpel = query.contains("#pageable");
 
-        Metadata queryMeta = new Metadata();
+        Metadata qryMeta = new Metadata();
         this.query = ParameterBindingParser.INSTANCE
             .parseParameterBindingsOfQueryIntoBindingsAndReturnCleanedQuery(query, bindings,
-                queryMeta);
+                qryMeta);
 
-        usesJdbcStyleParameters = queryMeta.usesJdbcStyleParameters;
+        usesJdbcStyleParameters = qryMeta.usesJdbcStyleParameters;
         alias = QueryUtils.detectAlias(query);
         hasConstructorExpression = QueryUtils.hasConstructorExpression(query);
     }
@@ -396,29 +396,29 @@ class StringQuery implements DeclaredQuery {
              * position of the greatest discovered index parameter in order to
              * not mix-up with the actual parameter indices.
              */
-            int expressionParameterIndex = parametersShouldBeAccessedByIndex ? greatestParameterIndex : 0;
+            int expressionParamIdx = parametersShouldBeAccessedByIndex ? greatestParameterIndex : 0;
 
-            BiFunction<Integer, String, String> indexToParameterName = parametersShouldBeAccessedByIndex
+            BiFunction<Integer, String, String> idxToParamName = parametersShouldBeAccessedByIndex
                 ? (index, expression) -> String.valueOf(
-                index + expressionParameterIndex + 1)
+                index + expressionParamIdx + 1)
                 : (index, expression) ->
                 EXPRESSION_PARAMETER_PREFIX + (index
                     + 1);
 
             String fixedPrefix = parametersShouldBeAccessedByIndex ? "?" : ":";
 
-            BiFunction<String, String, String> parameterNameToReplacement = (prefix, name) -> fixedPrefix + name;
+            BiFunction<String, String, String> paramNameToReplacement = (prefix, name) -> fixedPrefix + name;
 
-            return SpelQueryContext.of(indexToParameterName, parameterNameToReplacement).parse(queryWithSpel);
+            return SpelQueryContext.of(idxToParamName, paramNameToReplacement).parse(queryWithSpel);
         }
 
         /** */
         private static String replaceFirst(String text, String substring, String replacement) {
-            int index = text.indexOf(substring);
-            if (index < 0)
+            int idx = text.indexOf(substring);
+            if (idx < 0)
                 return text;
 
-            return text.substring(0, index) + replacement + text.substring(index + substring.length());
+            return text.substring(0, idx) + replacement + text.substring(idx + substring.length());
         }
 
         /** */
@@ -431,18 +431,18 @@ class StringQuery implements DeclaredQuery {
 
         /** */
         private static int tryFindGreatestParameterIndexIn(String query) {
-            Matcher parameterIndexMatcher = PARAMETER_BINDING_BY_INDEX.matcher(query);
+            Matcher paramIdxMatcher = PARAMETER_BINDING_BY_INDEX.matcher(query);
 
-            int greatestParameterIndex = -1;
-            while (parameterIndexMatcher.find()) {
+            int greatestParamIdx = -1;
+            while (paramIdxMatcher.find()) {
 
-                String parameterIndexString = parameterIndexMatcher.group(1);
-                Integer parameterIndex = getParameterIndex(parameterIndexString);
-                if (parameterIndex != null)
-                    greatestParameterIndex = Math.max(greatestParameterIndex, parameterIndex);
+                String paramIdxStr = paramIdxMatcher.group(1);
+                Integer paramIdx = getParameterIndex(paramIdxStr);
+                if (paramIdx != null)
+                    greatestParamIdx = Math.max(greatestParamIdx, paramIdx);
             }
 
-            return greatestParameterIndex;
+            return greatestParamIdx;
         }
 
         /** */
@@ -901,15 +901,15 @@ class StringQuery implements DeclaredQuery {
             int start = 0;
 
             for (int i = 0; i < query.length(); i++) {
-                char currentChar = query.charAt(i);
+                char curChar = query.charAt(i);
 
-                if (QUOTING_CHARACTERS.contains(currentChar)) {
+                if (QUOTING_CHARACTERS.contains(curChar)) {
                     if (inQuotation == null) {
 
-                        inQuotation = currentChar;
+                        inQuotation = curChar;
                         start = i;
                     }
-                    else if (currentChar == inQuotation) {
+                    else if (curChar == inQuotation) {
                         inQuotation = null;
 
                         quotedRanges.add(Range.from(Bound.inclusive(start)).to(Bound.inclusive(i)));
diff --git a/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/support/IgniteRepositoryFactory.java b/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/support/IgniteRepositoryFactory.java
index 7af32b90..bbe7efa5 100644
--- a/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/support/IgniteRepositoryFactory.java
+++ b/modules/spring-data-ext/spring-data/src/main/java/org/apache/ignite/springdata/repository/support/IgniteRepositoryFactory.java
@@ -136,10 +136,10 @@ public class IgniteRepositoryFactory extends RepositoryFactorySupport {
 
                 String qryStr = annotation.value();
 
-                boolean annotatedIgniteQuery = !annotation.dynamicQuery() && (StringUtils.hasText(qryStr) || annotation
+                boolean annotatedIgniteQry = !annotation.dynamicQuery() && (StringUtils.hasText(qryStr) || annotation
                     .textQuery());
 
-                IgniteQuery query = annotatedIgniteQuery
+                IgniteQuery qry = annotatedIgniteQry
                     ? new IgniteQuery(
                         qryStr,
                         !annotation.textQuery() && (isFieldQuery(qryStr) || annotation.forceFieldsQuery()),
@@ -150,8 +150,8 @@ public class IgniteRepositoryFactory extends RepositoryFactorySupport {
                     : null;
 
                 if (key != QueryLookupStrategy.Key.CREATE) {
-                    return new IgniteRepositoryQuery(metadata, query, mtd, factory, cache,
-                        annotatedIgniteQuery ? DynamicQueryConfig.fromQueryAnnotation(annotation) : null,
+                    return new IgniteRepositoryQuery(metadata, qry, mtd, factory, cache,
+                        annotatedIgniteQry ? DynamicQueryConfig.fromQueryAnnotation(annotation) : null,
                         evaluationContextProvider);
                 }
             }
diff --git a/modules/spring-data-ext/spring-data/src/test/java/org/apache/ignite/springdata/IgniteSpringDataCrudSelfTest.java b/modules/spring-data-ext/spring-data/src/test/java/org/apache/ignite/springdata/IgniteSpringDataCrudSelfTest.java
index d21f8783..f6f1c3fd 100644
--- a/modules/spring-data-ext/spring-data/src/test/java/org/apache/ignite/springdata/IgniteSpringDataCrudSelfTest.java
+++ b/modules/spring-data-ext/spring-data/src/test/java/org/apache/ignite/springdata/IgniteSpringDataCrudSelfTest.java
@@ -262,10 +262,10 @@ public class IgniteSpringDataCrudSelfTest extends GridCommonAbstractTest {
      */
     @Test
     public void testDeleteExpressionMultiple() {
-        long count = repo.countByFirstName("nonUniquePerson");
-        long cnt = repo.deleteByFirstName("nonUniquePerson");
+        long cnt = repo.countByFirstName("nonUniquePerson");
+        long cntDel = repo.deleteByFirstName("nonUniquePerson");
 
-        assertEquals(cnt, count);
+        assertEquals(cntDel, cnt);
     }
 
     /**
@@ -275,8 +275,8 @@ public class IgniteSpringDataCrudSelfTest extends GridCommonAbstractTest {
     public void testRemoveExpression() {
         repo.removeByFirstName("person3f");
 
-        long count = repo.count();
-        assertEquals(CACHE_SIZE - 1, count);
+        long cnt = repo.count();
+        assertEquals(CACHE_SIZE - 1, cnt);
     }
 
     /**
@@ -286,8 +286,8 @@ public class IgniteSpringDataCrudSelfTest extends GridCommonAbstractTest {
     public void testDeleteQuery() {
         repo.deleteBySecondNameLowerCase("uniqueLastName");
 
-        long countAfter = repo.count();
-        assertEquals(CACHE_SIZE - 1, countAfter);
+        long cnt = repo.count();
+        assertEquals(CACHE_SIZE - 1, cnt);
     }
 
     /**
@@ -295,7 +295,7 @@ public class IgniteSpringDataCrudSelfTest extends GridCommonAbstractTest {
      */
     @Test
     public void testWrongDeleteQuery() {
-        long countBefore = repo.countByFirstNameLike("person3f");
+        long cntBefore = repo.countByFirstNameLike("person3f");
 
         try {
             repo.deleteWrongByFirstNameQuery("person3f");
@@ -304,8 +304,8 @@ public class IgniteSpringDataCrudSelfTest extends GridCommonAbstractTest {
             //expected
         }
 
-        long countAfter = repo.countByFirstNameLike("person3f");
-        assertEquals(countBefore, countAfter);
+        long cntAfter = repo.countByFirstNameLike("person3f");
+        assertEquals(cntBefore, cntAfter);
     }
 
     /**
diff --git a/modules/spring-session-ext/src/test/java/org/apache/ignite/spring/sessions/IgniteIndexedSessionRepositoryTest.java b/modules/spring-session-ext/src/test/java/org/apache/ignite/spring/sessions/IgniteIndexedSessionRepositoryTest.java
index 342d901e..68148dd4 100644
--- a/modules/spring-session-ext/src/test/java/org/apache/ignite/spring/sessions/IgniteIndexedSessionRepositoryTest.java
+++ b/modules/spring-session-ext/src/test/java/org/apache/ignite/spring/sessions/IgniteIndexedSessionRepositoryTest.java
@@ -436,8 +436,8 @@ public class IgniteIndexedSessionRepositoryTest {
         ses.setAttribute("attribute1", "value1");
         ses.setAttribute("attribute2", "value2");
 
-        for (String attributeName : ses.getAttributeNames())
-            ses.removeAttribute(attributeName);
+        for (String attrName : ses.getAttributeNames())
+            ses.removeAttribute(attrName);
 
         assertThat(ses.getAttributeNames()).isEmpty();
     }
diff --git a/modules/spring-tx-ext/spring-tx/pom.xml b/modules/spring-tx-ext/spring-tx/pom.xml
index 926a4219..4adf4e3c 100644
--- a/modules/spring-tx-ext/spring-tx/pom.xml
+++ b/modules/spring-tx-ext/spring-tx/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/ssh-ext/pom.xml b/modules/ssh-ext/pom.xml
index a8d24c80..e17a70c8 100644
--- a/modules/ssh-ext/pom.xml
+++ b/modules/ssh-ext/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/ssh-ext/src/main/java/org/apache/ignite/internal/util/nodestart/StartNodeCallableImpl.java b/modules/ssh-ext/src/main/java/org/apache/ignite/internal/util/nodestart/StartNodeCallableImpl.java
index 57bb2eb0..044b5cce 100644
--- a/modules/ssh-ext/src/main/java/org/apache/ignite/internal/util/nodestart/StartNodeCallableImpl.java
+++ b/modules/ssh-ext/src/main/java/org/apache/ignite/internal/util/nodestart/StartNodeCallableImpl.java
@@ -591,8 +591,8 @@ public class StartNodeCallableImpl implements StartNodeCallable {
      * @param loggers Loggers.
      */
     private void info(String msg, IgniteLogger... loggers) {
-        for (IgniteLogger logger : loggers)
-            if (logger != null && logger.isInfoEnabled())
-                logger.info(msg);
+        for (IgniteLogger log : loggers)
+            if (log != null && log.isInfoEnabled())
+                log.info(msg);
     }
 }
diff --git a/modules/storm-ext/pom.xml b/modules/storm-ext/pom.xml
index 99cc9dd1..5d48ef78 100644
--- a/modules/storm-ext/pom.xml
+++ b/modules/storm-ext/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/storm-ext/src/test/java/org/apache/ignite/stream/storm/StormIgniteStreamerSelfTest.java b/modules/storm-ext/src/test/java/org/apache/ignite/stream/storm/StormIgniteStreamerSelfTest.java
index b599fcf8..02089bda 100644
--- a/modules/storm-ext/src/test/java/org/apache/ignite/stream/storm/StormIgniteStreamerSelfTest.java
+++ b/modules/storm-ext/src/test/java/org/apache/ignite/stream/storm/StormIgniteStreamerSelfTest.java
@@ -126,7 +126,7 @@ public class StormIgniteStreamerSelfTest extends GridCommonAbstractTest {
                     builder.setSpout("test-spout", testStormSpout);
                     builder.setBolt("ignite-bolt", stormStreamer, STORM_EXECUTORS).shuffleGrouping("test-spout");
 
-                    StormTopology topology = builder.createTopology();
+                    StormTopology top = builder.createTopology();
 
                     // Prepares a mock data for the spout.
                     MockedSources mockedSources = new MockedSources();
@@ -140,16 +140,16 @@ public class StormIgniteStreamerSelfTest extends GridCommonAbstractTest {
 
                     IgniteCache<Integer, String> cache = ignite.cache(TEST_CACHE);
 
-                    CompleteTopologyParam completeTopologyParam = new CompleteTopologyParam();
+                    CompleteTopologyParam completeTopParam = new CompleteTopologyParam();
 
-                    completeTopologyParam.setTimeoutMs(10000);
-                    completeTopologyParam.setMockedSources(mockedSources);
-                    completeTopologyParam.setStormConf(conf);
+                    completeTopParam.setTimeoutMs(10000);
+                    completeTopParam.setMockedSources(mockedSources);
+                    completeTopParam.setStormConf(conf);
 
                     // Checks the cache doesn't contain any entries yet.
                     assertEquals(0, cache.size(CachePeekMode.PRIMARY));
 
-                    Testing.completeTopology(cluster, topology, completeTopologyParam);
+                    Testing.completeTopology(cluster, top, completeTopParam);
 
                     // Checks events successfully processed in 20 seconds.
                     assertTrue(latch.await(10, TimeUnit.SECONDS));
diff --git a/modules/topology-validator-ext/pom.xml b/modules/topology-validator-ext/pom.xml
index 7dd80584..fb969a35 100644
--- a/modules/topology-validator-ext/pom.xml
+++ b/modules/topology-validator-ext/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/twitter-ext/pom.xml b/modules/twitter-ext/pom.xml
index 56e4b70a..7b27dc79 100644
--- a/modules/twitter-ext/pom.xml
+++ b/modules/twitter-ext/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/yarn-ext/pom.xml b/modules/yarn-ext/pom.xml
index 0ccb49d8..55ff4233 100644
--- a/modules/yarn-ext/pom.xml
+++ b/modules/yarn-ext/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/ApplicationMaster.java b/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/ApplicationMaster.java
index 886f2d75..c810a883 100644
--- a/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/ApplicationMaster.java
+++ b/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/ApplicationMaster.java
@@ -121,11 +121,11 @@ public class ApplicationMaster implements AMRMClientAsync.CallbackHandler {
 
                     Map<String, String> env = new HashMap<>(ctx.getEnvironment());
 
-                    Map<String, String> systemEnv = System.getenv();
+                    Map<String, String> sysEnv = System.getenv();
 
-                    for (String key : systemEnv.keySet()) {
+                    for (String key : sysEnv.keySet()) {
                         if (key.matches("^IGNITE_[_0-9A-Z]+$"))
-                            env.put(key, systemEnv.get(key));
+                            env.put(key, sysEnv.get(key));
                     }
 
                     env.put("IGNITE_TCP_DISCOVERY_ADDRESSES", getAddress(c.getNodeId().getHost()));
diff --git a/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/ClusterProperties.java b/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/ClusterProperties.java
index 35f5da22..81406ff6 100644
--- a/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/ClusterProperties.java
+++ b/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/ClusterProperties.java
@@ -454,12 +454,12 @@ public class ClusterProperties {
         if (fileProps != null && fileProps.containsKey(name))
             return Double.valueOf(fileProps.getProperty(name));
 
-        String property = System.getProperty(name);
+        String prop = System.getProperty(name);
 
-        if (property == null)
-            property = System.getenv(name);
+        if (prop == null)
+            prop = System.getenv(name);
 
-        return property == null || property.isEmpty() ? defaultVal : Double.valueOf(property);
+        return prop == null || prop.isEmpty() ? defaultVal : Double.valueOf(prop);
     }
 
     /**
@@ -471,12 +471,12 @@ public class ClusterProperties {
         if (fileProps != null && fileProps.containsKey(name))
             return fileProps.getProperty(name);
 
-        String property = System.getProperty(name);
+        String prop = System.getProperty(name);
 
-        if (property == null)
-            property = System.getenv(name);
+        if (prop == null)
+            prop = System.getenv(name);
 
-        return property == null || property.isEmpty() ? defaultVal : property;
+        return prop == null || prop.isEmpty() ? defaultVal : prop;
     }
 
     /**
diff --git a/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/IgniteYarnClient.java b/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/IgniteYarnClient.java
index f9753e87..d5e04f06 100644
--- a/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/IgniteYarnClient.java
+++ b/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/IgniteYarnClient.java
@@ -137,16 +137,16 @@ public class IgniteYarnClient {
         capability.setVirtualCores(1);
 
         // Finally, set-up ApplicationSubmissionContext for the application
-        ApplicationSubmissionContext appContext = app.getApplicationSubmissionContext();
-        appContext.setApplicationName("ignition"); // application name
-        appContext.setAMContainerSpec(amContainer);
-        appContext.setResource(capability);
-        appContext.setQueue(props.yarnQueue()); // queue
+        ApplicationSubmissionContext appCtx = app.getApplicationSubmissionContext();
+        appCtx.setApplicationName("ignition"); // application name
+        appCtx.setAMContainerSpec(amContainer);
+        appCtx.setResource(capability);
+        appCtx.setQueue(props.yarnQueue()); // queue
 
         // Submit application
-        ApplicationId appId = appContext.getApplicationId();
+        ApplicationId appId = appCtx.getApplicationId();
 
-        yarnClient.submitApplication(appContext);
+        yarnClient.submitApplication(appCtx);
 
         log.log(Level.INFO, "Submitted application. Application id: {0}", appId);
 
diff --git a/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/utils/IgniteYarnUtils.java b/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/utils/IgniteYarnUtils.java
index 345d032d..1c62f010 100644
--- a/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/utils/IgniteYarnUtils.java
+++ b/modules/yarn-ext/src/main/java/org/apache/ignite/yarn/utils/IgniteYarnUtils.java
@@ -59,19 +59,19 @@ public class IgniteYarnUtils {
      */
     public static LocalResource setupFile(Path file, FileSystem fs, LocalResourceType type)
         throws Exception {
-        LocalResource resource = Records.newRecord(LocalResource.class);
+        LocalResource rsrc = Records.newRecord(LocalResource.class);
 
         file = fs.makeQualified(file);
 
         FileStatus stat = fs.getFileStatus(file);
 
-        resource.setResource(ConverterUtils.getYarnUrlFromPath(file));
-        resource.setSize(stat.getLen());
-        resource.setTimestamp(stat.getModificationTime());
-        resource.setType(type);
-        resource.setVisibility(LocalResourceVisibility.APPLICATION);
+        rsrc.setResource(ConverterUtils.getYarnUrlFromPath(file));
+        rsrc.setSize(stat.getLen());
+        rsrc.setTimestamp(stat.getModificationTime());
+        rsrc.setType(type);
+        rsrc.setVisibility(LocalResourceVisibility.APPLICATION);
 
-        return resource;
+        return rsrc;
     }
 
     /**
diff --git a/modules/zeromq-ext/pom.xml b/modules/zeromq-ext/pom.xml
index b11cc9c1..68b07471 100644
--- a/modules/zeromq-ext/pom.xml
+++ b/modules/zeromq-ext/pom.xml
@@ -20,7 +20,9 @@
 <!--
     POM file.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
diff --git a/modules/zeromq-ext/src/main/java/org/apache/ignite/stream/zeromq/IgniteZeroMqStreamer.java b/modules/zeromq-ext/src/main/java/org/apache/ignite/stream/zeromq/IgniteZeroMqStreamer.java
index 1a8e15b3..6ed8bd41 100644
--- a/modules/zeromq-ext/src/main/java/org/apache/ignite/stream/zeromq/IgniteZeroMqStreamer.java
+++ b/modules/zeromq-ext/src/main/java/org/apache/ignite/stream/zeromq/IgniteZeroMqStreamer.java
@@ -96,19 +96,19 @@ public class IgniteZeroMqStreamer<K, V> extends StreamAdapter<byte[], K, V> impl
         ctx = ZMQ.context(ioThreads);
 
         zeroMqExSrv.execute(() -> {
-            ZMQ.Socket socket = ctx.socket(socketType);
-            socket.connect(addr);
+            ZMQ.Socket sock = ctx.socket(socketType);
+            sock.connect(addr);
 
             if (ZeroMqTypeSocket.SUB.getType() == socketType)
-                socket.subscribe(topic);
+                sock.subscribe(topic);
 
             while (isStarted) {
                 try {
-                    byte[] msg = socket.recv(0);
+                    byte[] msg = sock.recv(0);
 
                     if (ZeroMqTypeSocket.SUB.getType() == socketType) {
-                        if (socket.hasReceiveMore()) {
-                            addMessage(socket.recv(0));
+                        if (sock.hasReceiveMore()) {
+                            addMessage(sock.recv(0));
                             continue;
                         }
                     }
@@ -122,7 +122,7 @@ public class IgniteZeroMqStreamer<K, V> extends StreamAdapter<byte[], K, V> impl
                 }
             }
 
-            socket.close();
+            sock.close();
         });
     }
 
diff --git a/modules/zeromq-ext/src/test/java/org/apache/ignite/stream/zeromq/IgniteZeroMqStreamerTest.java b/modules/zeromq-ext/src/test/java/org/apache/ignite/stream/zeromq/IgniteZeroMqStreamerTest.java
index 626ecee4..4c51a541 100644
--- a/modules/zeromq-ext/src/test/java/org/apache/ignite/stream/zeromq/IgniteZeroMqStreamerTest.java
+++ b/modules/zeromq-ext/src/test/java/org/apache/ignite/stream/zeromq/IgniteZeroMqStreamerTest.java
@@ -155,10 +155,10 @@ public class IgniteZeroMqStreamerTest extends GridCommonAbstractTest {
         // Last element.
         int testId = CACHE_ENTRY_COUNT - 1;
 
-        String cachedValue = cache.get(testId);
+        String cachedVal = cache.get(testId);
 
         // ZeroMQ message successfully put to cache.
-        assertTrue(cachedValue != null && cachedValue.endsWith(String.valueOf(testId)));
+        assertTrue(cachedVal != null && cachedVal.endsWith(String.valueOf(testId)));
 
         assertTrue(cache.size() == CACHE_ENTRY_COUNT);
 
diff --git a/modules/zookeeper-ip-finder-ext/zookeeper-ip-finder/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/zk/TcpDiscoveryZookeeperIpFinder.java b/modules/zookeeper-ip-finder-ext/zookeeper-ip-finder/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/zk/TcpDiscoveryZookeeperIpFinder.java
index 3aef441b..e537dc67 100644
--- a/modules/zookeeper-ip-finder-ext/zookeeper-ip-finder/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/zk/TcpDiscoveryZookeeperIpFinder.java
+++ b/modules/zookeeper-ip-finder-ext/zookeeper-ip-finder/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/zk/TcpDiscoveryZookeeperIpFinder.java
@@ -133,10 +133,10 @@ public class TcpDiscoveryZookeeperIpFinder extends TcpDiscoveryIpFinderAdapter {
         if (!initGuard.compareAndSet(false, true))
             return;
 
-        String sysPropZkConnString = IgniteSystemProperties.getString(PROP_ZK_CONNECTION_STRING);
+        String sysPropZkConnStr = IgniteSystemProperties.getString(PROP_ZK_CONNECTION_STRING);
 
-        if (sysPropZkConnString != null && !sysPropZkConnString.trim().isEmpty())
-            zkConnectionString = sysPropZkConnString;
+        if (sysPropZkConnStr != null && !sysPropZkConnStr.trim().isEmpty())
+            zkConnectionString = sysPropZkConnStr;
 
         if (log.isInfoEnabled())
             log.info("Initializing ZooKeeper IP Finder.");
@@ -184,10 +184,10 @@ public class TcpDiscoveryZookeeperIpFinder extends TcpDiscoveryIpFinderAdapter {
         if (log.isDebugEnabled())
             log.debug("Getting registered addresses from ZooKeeper IP Finder.");
 
-        Collection<ServiceInstance<IgniteInstanceDetails>> serviceInstances;
+        Collection<ServiceInstance<IgniteInstanceDetails>> srvcInstances;
 
         try {
-            serviceInstances = discovery.queryForInstances(serviceName);
+            srvcInstances = discovery.queryForInstances(serviceName);
         }
         catch (Exception e) {
             log.warning("Error while getting registered addresses from ZooKeeper IP Finder.", e);
@@ -196,7 +196,7 @@ public class TcpDiscoveryZookeeperIpFinder extends TcpDiscoveryIpFinderAdapter {
 
         Set<InetSocketAddress> answer = new HashSet<>();
 
-        for (ServiceInstance<IgniteInstanceDetails> si : serviceInstances)
+        for (ServiceInstance<IgniteInstanceDetails> si : srvcInstances)
             answer.add(new InetSocketAddress(si.getAddress(), si.getPort()));
 
         if (log.isInfoEnabled())