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Posted to commits@lucene.apache.org by er...@apache.org on 2018/03/26 02:16:38 UTC

[1/3] lucene-solr:master: SOLR-7887: Upgrade Solr to use log4j2 -- log4j 1 now officially end of life

Repository: lucene-solr
Updated Branches:
  refs/heads/master 4bb02d868 -> 624d128b5


http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/solr-ref-guide/src/taking-solr-to-production.adoc
----------------------------------------------------------------------
diff --git a/solr/solr-ref-guide/src/taking-solr-to-production.adoc b/solr/solr-ref-guide/src/taking-solr-to-production.adoc
index 4ede6b4..e4dcd95 100644
--- a/solr/solr-ref-guide/src/taking-solr-to-production.adoc
+++ b/solr/solr-ref-guide/src/taking-solr-to-production.adoc
@@ -107,11 +107,11 @@ The `SOLR_PID_DIR` variable sets the directory where the <<solr-control-script-r
 
 ==== Log Settings
 
-Solr uses Apache Log4J for logging. The installation script copies `/opt/solr/server/resources/log4j.properties` to `/var/solr/log4j.properties`. Take a moment to verify that the Solr include file is configured to send logs to the correct location by checking the following settings in `/etc/default/solr.in.sh`:
+Solr uses Apache Log4J for logging. The installation script copies `/opt/solr/server/resources/log4j2.xml` to `/var/solr/log4j2.xml`. Take a moment to verify that the Solr include file is configured to send logs to the correct location by checking the following settings in `/etc/default/solr.in.sh`:
 
 [source,bash]
 ----
-LOG4J_PROPS=/var/solr/log4j.properties
+LOG4J_PROPS=/var/solr/log4j2.xml
 SOLR_LOGS_DIR=/var/solr/logs
 ----
 

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/solrj/ivy.xml
----------------------------------------------------------------------
diff --git a/solr/solrj/ivy.xml b/solr/solrj/ivy.xml
index 3637bc3..8fb9ff9 100644
--- a/solr/solrj/ivy.xml
+++ b/solr/solrj/ivy.xml
@@ -40,7 +40,7 @@
     <dependency org="org.slf4j" name="slf4j-api" rev="${/org.slf4j/slf4j-api}" conf="compile"/>
     <dependency org="org.slf4j" name="jcl-over-slf4j" rev="${/org.slf4j/jcl-over-slf4j}" conf="compile"/>
 
-    <dependency org="org.slf4j" name="slf4j-log4j12" rev="${/org.slf4j/slf4j-log4j12}" conf="test"/>
+    <dependency org="org.apache.logging.log4j" name="log4j-slf4j-impl" rev="${/org.apache.logging.log4j/log4j-slf4j-impl}" conf="test"/>
 
     <dependency org="org.mockito" name="mockito-core" rev="${/org.mockito/mockito-core}" conf="test"/>
     <dependency org="net.bytebuddy" name="byte-buddy" rev="${/net.bytebuddy/byte-buddy}" conf="test"/>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/solrj/src/test-files/log4j.properties
----------------------------------------------------------------------
diff --git a/solr/solrj/src/test-files/log4j.properties b/solr/solrj/src/test-files/log4j.properties
deleted file mode 100644
index dae4f6f..0000000
--- a/solr/solrj/src/test-files/log4j.properties
+++ /dev/null
@@ -1,32 +0,0 @@
-#  Logging level
-log4j.rootLogger=INFO, CONSOLE
-
-log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
-log4j.appender.CONSOLE.Target=System.err
-log4j.appender.CONSOLE.layout=org.apache.log4j.EnhancedPatternLayout
-log4j.appender.CONSOLE.layout.ConversionPattern=%-4r %-5p (%t) [%X{node_name} %X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
-log4j.logger.org.apache.zookeeper=WARN
-log4j.logger.org.apache.hadoop=WARN
-log4j.logger.org.apache.directory=WARN
-log4j.logger.org.apache.solr.hadoop=INFO
-
-#log4j.logger.org.apache.solr.update.processor.LogUpdateProcessorFactory=DEBUG
-#log4j.logger.org.apache.solr.update.processor.DistributedUpdateProcessor=DEBUG
-#log4j.logger.org.apache.solr.update.PeerSync=DEBUG
-#log4j.logger.org.apache.solr.core.CoreContainer=DEBUG
-#log4j.logger.org.apache.solr.cloud.RecoveryStrategy=DEBUG
-#log4j.logger.org.apache.solr.cloud.SyncStrategy=DEBUG
-#log4j.logger.org.apache.solr.handler.admin.CoreAdminHandler=DEBUG
-#log4j.logger.org.apache.solr.cloud.ZkController=DEBUG
-#log4j.logger.org.apache.solr.update.DefaultSolrCoreState=DEBUG
-#log4j.logger.org.apache.solr.common.cloud.ConnectionManager=DEBUG
-#log4j.logger.org.apache.solr.update.UpdateLog=DEBUG
-#log4j.logger.org.apache.solr.cloud.ChaosMonkey=DEBUG
-#log4j.logger.org.apache.solr.update.TransactionLog=DEBUG
-#log4j.logger.org.apache.solr.handler.ReplicationHandler=DEBUG
-#log4j.logger.org.apache.solr.handler.IndexFetcher=DEBUG
-
-#log4j.logger.org.apache.solr.common.cloud.ClusterStateUtil=DEBUG
-#log4j.logger.org.apache.solr.cloud.OverseerAutoReplicaFailoverThread=DEBUG
-
-# log4j.logger.org.apache.http.impl.conn.PoolingHttpClientConnectionManager=DEBUG
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/solrj/src/test-files/log4j2.xml
----------------------------------------------------------------------
diff --git a/solr/solrj/src/test-files/log4j2.xml b/solr/solrj/src/test-files/log4j2.xml
new file mode 100644
index 0000000..b5421a8
--- /dev/null
+++ b/solr/solrj/src/test-files/log4j2.xml
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<Configuration>
+  <Appenders>
+    <Console name="STDERR" target="SYSTEM_ERR">
+      <PatternLayout>
+        <Pattern>
+          %-4r %-5p (%t) [%X{node_name} %X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
+        </Pattern>
+      </PatternLayout>
+    </Console>
+  </Appenders>
+  <Loggers>
+    <Logger name="org.apache.zookeeper" level="WARN"/>
+    <Logger name="org.apache.hadoop" level="WARN"/>
+    <Logger name="org.apache.directory" level="WARN"/>
+    <Logger name="log4j.logger.org.apache.solr.hadoop" level="INFO"/>
+
+    <Root level="INFO">
+      <AppenderRef ref="STDERR"/>
+    </Root>
+  </Loggers>
+</Configuration>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/test-framework/src/java/org/apache/solr/SolrTestCaseJ4.java
----------------------------------------------------------------------
diff --git a/solr/test-framework/src/java/org/apache/solr/SolrTestCaseJ4.java b/solr/test-framework/src/java/org/apache/solr/SolrTestCaseJ4.java
index 3197d10..477891c 100644
--- a/solr/test-framework/src/java/org/apache/solr/SolrTestCaseJ4.java
+++ b/solr/test-framework/src/java/org/apache/solr/SolrTestCaseJ4.java
@@ -70,6 +70,7 @@ import com.carrotsearch.randomizedtesting.rules.SystemPropertiesRestoreRule;
 
 import org.apache.commons.io.FileUtils;
 import org.apache.http.client.HttpClient;
+import org.apache.logging.log4j.Level;
 import org.apache.lucene.analysis.MockAnalyzer;
 import org.apache.lucene.analysis.MockTokenizer;
 import org.apache.lucene.index.IndexWriterConfig;
@@ -396,7 +397,7 @@ public abstract class SolrTestCaseJ4 extends LuceneTestCase {
     return result;
   }
 
-  private static Map<String, String> savedClassLogLevels = new HashMap<>();
+  private static Map<String, Level> savedClassLogLevels = new HashMap<>();
 
   public static void initClassLogLevels() {
     Class currentClass = RandomizedContext.current().getTargetClass();
@@ -404,11 +405,11 @@ public abstract class SolrTestCaseJ4 extends LuceneTestCase {
     if (annotation == null) {
       return;
     }
-    Map<String, String> previousLevels = LogLevel.Configurer.setLevels(annotation.value());
+    Map<String, Level> previousLevels = LogLevel.Configurer.setLevels(annotation.value());
     savedClassLogLevels.putAll(previousLevels);
   }
 
-  private Map<String, String> savedMethodLogLevels = new HashMap<>();
+  private Map<String, Level> savedMethodLogLevels = new HashMap<>();
 
   @Before
   public void initMethodLogLevels() {
@@ -417,7 +418,7 @@ public abstract class SolrTestCaseJ4 extends LuceneTestCase {
     if (annotation == null) {
       return;
     }
-    Map<String, String> previousLevels = LogLevel.Configurer.setLevels(annotation.value());
+    Map<String, Level> previousLevels = LogLevel.Configurer.setLevels(annotation.value());
     savedMethodLogLevels.putAll(previousLevels);
   }
 

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/test-framework/src/java/org/apache/solr/util/LogLevel.java
----------------------------------------------------------------------
diff --git a/solr/test-framework/src/java/org/apache/solr/util/LogLevel.java b/solr/test-framework/src/java/org/apache/solr/util/LogLevel.java
index 7542694..2de5ec0 100644
--- a/solr/test-framework/src/java/org/apache/solr/util/LogLevel.java
+++ b/solr/test-framework/src/java/org/apache/solr/util/LogLevel.java
@@ -26,8 +26,10 @@ import java.lang.annotation.Target;
 import java.util.HashMap;
 import java.util.Map;
 
-import org.apache.log4j.Level;
-import org.apache.log4j.Logger;
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.core.LoggerContext;
+import org.apache.logging.log4j.core.config.Configuration;
+import org.apache.logging.log4j.core.config.LoggerConfig;
 import org.apache.solr.common.util.SuppressForbidden;
 
 /**
@@ -57,35 +59,44 @@ public @interface LogLevel {
       Map<String, Level> testlevels = new HashMap<>();
       for (String levelSetting : input.split(";")) {
         String[] parts = levelSetting.split("=");
-        testlevels.put(parts[0], Level.toLevel(parts[1]));
+        testlevels.put(parts[0], parseLevel(parts[1]));
       }
       return testlevels;
     }
 
-    private static String levelAsString(Level level) {
-      return level == null ? null : level.toString();
-    }
-
     private static Level parseLevel(String level) {
       return level == null ? null : Level.toLevel(level);
     }
 
-    public static void restoreLogLevels(Map<String, String> savedLogLevels) {
-      savedLogLevels.forEach((name, level) -> {
-        Logger logger = Logger.getLogger(name);
-        logger.setLevel(parseLevel(level));
-      });
+    public static void restoreLogLevels(Map<String, Level> savedLogLevels) {
+      setLogLevels(savedLogLevels);
     }
 
-    public static Map<String, String> setLevels(String value) {
-      Map<String, String> oldLevels = new HashMap<>();
-      parseFrom(value).forEach((name, level) -> {
-        Logger logger = Logger.getLogger(name);
-        oldLevels.put(name, levelAsString(logger.getLevel()));
-        logger.setLevel(level);
+    public static Map<String, Level> setLevels(String value) {
+      return setLogLevels(parseFrom(value));
+    }
+
+    private static Map<String, Level> setLogLevels(Map<String, Level> logLevels) {
+      LoggerContext ctx = LoggerContext.getContext(false);
+      Configuration config = ctx.getConfiguration();
+
+      Map<String, Level> oldLevels = new HashMap<>();
+      logLevels.forEach((loggerName, level) -> {
+        LoggerConfig logConfig = config.getLoggerConfig(loggerName);
+        // what the initial logger level was. It will use the root value if logger is being defined for the first time
+        oldLevels.put(loggerName, logConfig.getLevel());
+        if (loggerName.equals(logConfig.getName())) {
+          logConfig.setLevel(level);
+        } else {
+          LoggerConfig loggerConfig = new LoggerConfig(loggerName, level, true);
+          loggerConfig.setLevel(level);
+          config.addLogger(loggerName, loggerConfig);
+        }
       });
+      ctx.updateLoggers();
       return oldLevels;
     }
+
   }
 
 }

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/test-framework/src/test-files/log4j.properties
----------------------------------------------------------------------
diff --git a/solr/test-framework/src/test-files/log4j.properties b/solr/test-framework/src/test-files/log4j.properties
deleted file mode 100644
index f6fedb6..0000000
--- a/solr/test-framework/src/test-files/log4j.properties
+++ /dev/null
@@ -1,11 +0,0 @@
-#  Logging level
-log4j.rootLogger=INFO, CONSOLE
-
-log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
-log4j.appender.CONSOLE.Target=System.err
-log4j.appender.CONSOLE.layout=org.apache.log4j.EnhancedPatternLayout
-log4j.appender.CONSOLE.layout.ConversionPattern=%-4r %-5p (%t) [%X{node_name} %X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
-log4j.logger.org.apache.zookeeper=WARN
-log4j.logger.org.apache.hadoop=WARN
-log4j.logger.org.apache.directory=WARN
-log4j.logger.org.apache.solr.hadoop=INFO
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/test-framework/src/test-files/log4j2.xml
----------------------------------------------------------------------
diff --git a/solr/test-framework/src/test-files/log4j2.xml b/solr/test-framework/src/test-files/log4j2.xml
new file mode 100644
index 0000000..b5421a8
--- /dev/null
+++ b/solr/test-framework/src/test-files/log4j2.xml
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<Configuration>
+  <Appenders>
+    <Console name="STDERR" target="SYSTEM_ERR">
+      <PatternLayout>
+        <Pattern>
+          %-4r %-5p (%t) [%X{node_name} %X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
+        </Pattern>
+      </PatternLayout>
+    </Console>
+  </Appenders>
+  <Loggers>
+    <Logger name="org.apache.zookeeper" level="WARN"/>
+    <Logger name="org.apache.hadoop" level="WARN"/>
+    <Logger name="org.apache.directory" level="WARN"/>
+    <Logger name="log4j.logger.org.apache.solr.hadoop" level="INFO"/>
+
+    <Root level="INFO">
+      <AppenderRef ref="STDERR"/>
+    </Root>
+  </Loggers>
+</Configuration>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/test-framework/src/test/org/apache/solr/TestLogLevelAnnotations.java
----------------------------------------------------------------------
diff --git a/solr/test-framework/src/test/org/apache/solr/TestLogLevelAnnotations.java b/solr/test-framework/src/test/org/apache/solr/TestLogLevelAnnotations.java
index 2ede874..098df00 100644
--- a/solr/test-framework/src/test/org/apache/solr/TestLogLevelAnnotations.java
+++ b/solr/test-framework/src/test/org/apache/solr/TestLogLevelAnnotations.java
@@ -17,8 +17,8 @@
 
 package org.apache.solr;
 
-import org.apache.log4j.Level;
-import org.apache.log4j.Logger;
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.LogManager;
 import org.apache.solr.common.util.SuppressForbidden;
 import org.apache.solr.util.LogLevel;
 import org.junit.Test;
@@ -29,19 +29,15 @@ public class TestLogLevelAnnotations extends SolrTestCaseJ4 {
 
   @Test
   public void testClassLogLevels() {
-    Logger classLogLevel = Logger.getLogger("org.apache.solr.ClassLogLevel");
-    assertEquals(Level.ERROR, classLogLevel.getLevel());
-    Logger methodLogLevel = Logger.getLogger("org.apache.solr.MethodLogLevel");
-    assertEquals(Level.WARN, methodLogLevel.getLevel());
+    assertEquals(Level.ERROR, LogManager.getLogger("org.apache.solr.ClassLogLevel").getLevel());
+    assertEquals(Level.WARN, LogManager.getLogger("org.apache.solr.MethodLogLevel").getLevel());
   }
 
   @Test
   @LogLevel("org.apache.solr.MethodLogLevel=debug")
   public void testMethodLogLevels() {
-    Logger classLogLevel = Logger.getLogger("org.apache.solr.ClassLogLevel");
-    assertEquals(Level.ERROR, classLogLevel.getLevel());
-    Logger methodLogLevel = Logger.getLogger("org.apache.solr.MethodLogLevel");
-    assertEquals(Level.DEBUG, methodLogLevel.getLevel());
+    assertEquals(Level.ERROR, LogManager.getLogger("org.apache.solr.ClassLogLevel").getLevel());
+    assertEquals(Level.DEBUG, LogManager.getLogger("org.apache.solr.MethodLogLevel").getLevel());
   }
 
 }


[2/3] lucene-solr:master: SOLR-7887: Upgrade Solr to use log4j2 -- log4j 1 now officially end of life

Posted by er...@apache.org.
http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/test/org/apache/solr/handler/admin/LoggingHandlerTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/handler/admin/LoggingHandlerTest.java b/solr/core/src/test/org/apache/solr/handler/admin/LoggingHandlerTest.java
index 555c137..ea39c9f 100644
--- a/solr/core/src/test/org/apache/solr/handler/admin/LoggingHandlerTest.java
+++ b/solr/core/src/test/org/apache/solr/handler/admin/LoggingHandlerTest.java
@@ -16,12 +16,16 @@
  */
 package org.apache.solr.handler.admin;
 
-import org.apache.log4j.Level;
-import org.apache.log4j.Logger;
+
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.core.LoggerContext;
+import org.apache.logging.log4j.core.config.LoggerConfig;
 import org.apache.solr.SolrTestCaseJ4;
 import org.apache.solr.common.params.CommonParams;
 import org.apache.solr.common.util.SuppressForbidden;
-import org.apache.solr.logging.log4j.Log4jInfo;
+
 import org.junit.BeforeClass;
 import org.junit.Test;
 
@@ -42,21 +46,29 @@ public class LoggingHandlerTest extends SolrTestCaseJ4 {
 
   @Test
   public void testLogLevelHandlerOutput() throws Exception {
-    Logger tst = Logger.getLogger("org.apache.solr.SolrTestCaseJ4");
-    tst.setLevel(Level.INFO);
-    Log4jInfo wrap = new Log4jInfo(tst.getName(), tst);
+    Logger tst = LogManager.getLogger("org.apache.solr.SolrTestCaseJ4");
+ 
+    LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
+    LoggerConfig loggerConfig = ctx.getConfiguration().getLoggerConfig(tst.getName());
+    loggerConfig.setLevel(Level.INFO);
+    ctx.updateLoggers();
     
     assertQ("Show Log Levels OK",
             req(CommonParams.QT,"/admin/logging")
-            ,"//arr[@name='loggers']/lst/str[.='"+wrap.getName()+"']/../str[@name='level'][.='"+wrap.getLevel()+"']"
+            ,"//arr[@name='loggers']/lst/str[.='"+tst.getName()+"']/../str[@name='level'][.='"+tst.getLevel()+"']"
             ,"//arr[@name='loggers']/lst/str[.='org.apache']/../null[@name='level']"
             );
 
-    assertQ("Set and remove a level",
+    assertQ("Set a level",
             req(CommonParams.QT,"/admin/logging",  
-                "set", "org.xxx.yyy.abc:null",
-                "set", "org.xxx.yyy.zzz:TRACE")
-            ,"//arr[@name='loggers']/lst/str[.='org.xxx.yyy.zzz']/../str[@name='level'][.='TRACE']"
+                "set", tst.getName()+":TRACE")
+            ,"//arr[@name='loggers']/lst/str[.='"+tst.getName()+"']/../str[@name='level'][.='TRACE']"
             );
+    
+    assertQ("Remove a level",
+        req(CommonParams.QT,"/admin/logging",  
+            "set", tst.getName()+":null")
+        ,"//arr[@name='loggers']/lst/str[.='"+tst.getName()+"']/../str[@name='level'][.='OFF']"
+        );
   }
 }

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/test/org/apache/solr/logging/TestLogWatcher.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/logging/TestLogWatcher.java b/solr/core/src/test/org/apache/solr/logging/TestLogWatcher.java
index 6ae4518..6f7987f 100644
--- a/solr/core/src/test/org/apache/solr/logging/TestLogWatcher.java
+++ b/solr/core/src/test/org/apache/solr/logging/TestLogWatcher.java
@@ -56,4 +56,25 @@ public class TestLogWatcher {
     assertEquals(event.get("message"), "This is a test message");
 
   }
+
+  // This seems weird to do the same thing twice, this is valid. We need to test whether listeners are replaced....
+  @Test
+  public void testLog4jWatcherRepeat() {
+    LogWatcher watcher = LogWatcher.newRegisteredLogWatcher(config, null);
+
+    assertEquals(watcher.getLastEvent(), -1);
+
+    log.warn("This is a test message");
+
+    assertTrue(watcher.getLastEvent() > -1);
+
+    SolrDocumentList events = watcher.getHistory(-1, new AtomicBoolean());
+    assertEquals(events.size(), 1);
+
+    SolrDocument event = events.get(0);
+    assertEquals(event.get("logger"), "org.apache.solr.logging.TestLogWatcher");
+    assertEquals(event.get("message"), "This is a test message");
+
+  }
+
 }

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/test/org/apache/solr/metrics/reporters/SolrSlf4jReporterTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/metrics/reporters/SolrSlf4jReporterTest.java b/solr/core/src/test/org/apache/solr/metrics/reporters/SolrSlf4jReporterTest.java
index e3a5021..4cad788 100644
--- a/solr/core/src/test/org/apache/solr/metrics/reporters/SolrSlf4jReporterTest.java
+++ b/solr/core/src/test/org/apache/solr/metrics/reporters/SolrSlf4jReporterTest.java
@@ -47,9 +47,6 @@ public class SolrSlf4jReporterTest extends SolrTestCaseJ4 {
   @Test
   public void testReporter() throws Exception {
     ensureLoggingConfiguredAppropriately();
-    LogWatcherConfig watcherCfg = new LogWatcherConfig(true, null, null, 100);
-    LogWatcher watcher = LogWatcher.newRegisteredLogWatcher(watcherCfg, null);
-    watcher.setThreshold("INFO");
     Path home = Paths.get(TEST_HOME());
     // define these properties, they are used in solrconfig.xml
     System.setProperty("solr.test.sys.prop1", "propone");
@@ -70,6 +67,10 @@ public class SolrSlf4jReporterTest extends SolrTestCaseJ4 {
     assertNotNull(reporter2);
     assertTrue(reporter2 instanceof SolrSlf4jReporter);
 
+    LogWatcherConfig watcherCfg = new LogWatcherConfig(true, null, null, 100);
+    LogWatcher watcher = LogWatcher.newRegisteredLogWatcher(watcherCfg, null);
+    watcher.setThreshold("INFO");
+
     watcher.reset();
     int cnt = 20;
     boolean active;

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/test/org/apache/solr/util/TestSolrCLIRunExample.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/util/TestSolrCLIRunExample.java b/solr/core/src/test/org/apache/solr/util/TestSolrCLIRunExample.java
index 8900851..5f33b9e 100644
--- a/solr/core/src/test/org/apache/solr/util/TestSolrCLIRunExample.java
+++ b/solr/core/src/test/org/apache/solr/util/TestSolrCLIRunExample.java
@@ -125,6 +125,8 @@ public class TestSolrCLIRunExample extends SolrTestCaseJ4 {
               JettyConfig.builder().setContext("/solr").setPort(port).build();
           try {
             if (solrCloudCluster == null) {
+              Path logDir = createTempDir("solr_logs");
+              System.setProperty("solr.log.dir", logDir.toString());
               System.setProperty("host", "localhost");
               System.setProperty("jetty.port", String.valueOf(port));
               solrCloudCluster =
@@ -222,6 +224,7 @@ public class TestSolrCLIRunExample extends SolrTestCaseJ4 {
 
       System.setProperty("host", "localhost");
       System.setProperty("jetty.port", String.valueOf(port));
+      System.setProperty("solr.log.dir", createTempDir("solr_logs").toString());
 
       standaloneSolr = new JettySolrRunner(solrHomeDir.getAbsolutePath(), "/solr", port);
       Thread bg = new Thread() {

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/example/README.txt
----------------------------------------------------------------------
diff --git a/solr/example/README.txt b/solr/example/README.txt
index 562c256..e7fb573 100644
--- a/solr/example/README.txt
+++ b/solr/example/README.txt
@@ -72,7 +72,7 @@ solrconfig.xml.
 
 By default, Jetty & Solr will log to the console and logs/solr.log. This can
 be convenient when first getting started, but eventually you will want to
-log just to a file. To configure logging, edit the log4j.properties file in
+log just to a file. To configure logging, edit the log4j2.xml file in
 "resources".
 It is also possible to setup log4j or other popular logging frameworks.
 

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/example/example-DIH/solr/db/conf/solrconfig.xml
----------------------------------------------------------------------
diff --git a/solr/example/example-DIH/solr/db/conf/solrconfig.xml b/solr/example/example-DIH/solr/db/conf/solrconfig.xml
index 1ffbbe8..65f7395 100644
--- a/solr/example/example-DIH/solr/db/conf/solrconfig.xml
+++ b/solr/example/example-DIH/solr/db/conf/solrconfig.xml
@@ -240,7 +240,7 @@
 
          Setting the value to true will instruct the underlying Lucene
          IndexWriter to write its info stream to solr's log. By default,
-         this is enabled here, and controlled through log4j.properties.
+         this is enabled here, and controlled through log4j2.xml
       -->
      <infoStream>true</infoStream>
   </indexConfig>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/example/example-DIH/solr/mail/conf/solrconfig.xml
----------------------------------------------------------------------
diff --git a/solr/example/example-DIH/solr/mail/conf/solrconfig.xml b/solr/example/example-DIH/solr/mail/conf/solrconfig.xml
index 770b0fd..ec9d7c6 100644
--- a/solr/example/example-DIH/solr/mail/conf/solrconfig.xml
+++ b/solr/example/example-DIH/solr/mail/conf/solrconfig.xml
@@ -243,7 +243,7 @@
 
          Setting the value to true will instruct the underlying Lucene
          IndexWriter to write its info stream to solr's log. By default,
-         this is enabled here, and controlled through log4j.properties.
+         this is enabled here, and controlled through log4j2.xml
       -->
      <infoStream>true</infoStream>
   </indexConfig>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/example/example-DIH/solr/solr/conf/solrconfig.xml
----------------------------------------------------------------------
diff --git a/solr/example/example-DIH/solr/solr/conf/solrconfig.xml b/solr/example/example-DIH/solr/solr/conf/solrconfig.xml
index 3f00141..7d153f6 100644
--- a/solr/example/example-DIH/solr/solr/conf/solrconfig.xml
+++ b/solr/example/example-DIH/solr/solr/conf/solrconfig.xml
@@ -240,7 +240,7 @@
 
          Setting the value to true will instruct the underlying Lucene
          IndexWriter to write its info stream to solr's log. By default,
-         this is enabled here, and controlled through log4j.properties.
+         this is enabled here, and controlled through log4j2.xml
       -->
      <infoStream>true</infoStream>
   </indexConfig>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/example/resources/log4j.properties
----------------------------------------------------------------------
diff --git a/solr/example/resources/log4j.properties b/solr/example/resources/log4j.properties
deleted file mode 100644
index c6e9036..0000000
--- a/solr/example/resources/log4j.properties
+++ /dev/null
@@ -1,24 +0,0 @@
-#  Logging level
-solr.log=${solr.solr.home}/../logs
-log4j.rootLogger=INFO, file
-
-log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
-
-log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
-log4j.appender.CONSOLE.layout.ConversionPattern=%-4r [%t] %-5p %c %x [%X{collection} %X{shard} %X{replica} %X{core}] \u2013 %m%n
-
-#- size rotation with log cleanup.
-log4j.appender.file=org.apache.log4j.RollingFileAppender
-log4j.appender.file.MaxFileSize=32MB
-log4j.appender.file.MaxBackupIndex=10
-
-#- File to log to and log format
-log4j.appender.file.File=${solr.log}/solr.log
-log4j.appender.file.layout=org.apache.log4j.PatternLayout
-log4j.appender.file.layout.ConversionPattern=%-5p - %d{yyyy-MM-dd HH:mm:ss.SSS}; [%X{collection} %X{shard} %X{replica} %X{core}] %C; %m%n
-
-log4j.logger.org.apache.zookeeper=WARN
-log4j.logger.org.apache.hadoop=WARN
-
-# set to INFO to enable infostream log messages
-log4j.logger.org.apache.solr.update.LoggingInfoStream=OFF

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/example/resources/log4j2.xml
----------------------------------------------------------------------
diff --git a/solr/example/resources/log4j2.xml b/solr/example/resources/log4j2.xml
new file mode 100644
index 0000000..c6267d4
--- /dev/null
+++ b/solr/example/resources/log4j2.xml
@@ -0,0 +1,53 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<Configuration>
+  <Appenders>
+    <Console name="STDOUT" target="SYSTEM_OUT">
+      <PatternLayout>
+        <Pattern>
+          %-4r [%t] %-5p %c %x [%X{collection} %X{shard} %X{replica} %X{core}] %c; %m%n
+        </Pattern>
+      </PatternLayout>
+    </Console>
+    <RollingFile
+        name="RollingFile"
+        fileName="${sys:solr.solr.home}/../logs/solr.log"
+        filePattern="${sys:solr.solr.home}/../logs/solr.%i.log.gz" >
+      <PatternLayout>
+        <Pattern>
+          %-5p - %d{yyyy-MM-dd HH:mm:ss.SSS}; [%X{collection} %X{shard} %X{replica} %X{core}] %c; %m%n
+        </Pattern>
+      </PatternLayout>
+      <Policies>
+        <OnStartupTriggeringPolicy />
+        <SizeBasedTriggeringPolicy size="4 MB"/>
+      </Policies>
+    </RollingFile>
+  </Appenders>
+  <Loggers>
+    <Logger name="org.apache.hadoop" level="warn"/>
+    <Logger name="org.apache.solr.update.LoggingInfoStream" level="off"/>
+    <Logger name="org.apache.zookeeper" level="warn"/>
+
+    <Root level="info">
+      <AppenderRef ref="RollingFile"/>
+      <AppenderRef ref="STDOUT"/>
+    </Root>
+  </Loggers>
+</Configuration>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/disruptor-3.4.0.jar.sha1
----------------------------------------------------------------------
diff --git a/solr/licenses/disruptor-3.4.0.jar.sha1 b/solr/licenses/disruptor-3.4.0.jar.sha1
new file mode 100644
index 0000000..ba29f9c
--- /dev/null
+++ b/solr/licenses/disruptor-3.4.0.jar.sha1
@@ -0,0 +1 @@
+507e22993e3a78a3ba453e76a9756a294752648d

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/disruptor-LICENSE-ASL.txt
----------------------------------------------------------------------
diff --git a/solr/licenses/disruptor-LICENSE-ASL.txt b/solr/licenses/disruptor-LICENSE-ASL.txt
new file mode 100644
index 0000000..50086f8
--- /dev/null
+++ b/solr/licenses/disruptor-LICENSE-ASL.txt
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!) The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/disruptor-NOTICE.txt
----------------------------------------------------------------------
diff --git a/solr/licenses/disruptor-NOTICE.txt b/solr/licenses/disruptor-NOTICE.txt
new file mode 100644
index 0000000..e69de29

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/log4j-1.2-api-2.11.0.jar.sha1
----------------------------------------------------------------------
diff --git a/solr/licenses/log4j-1.2-api-2.11.0.jar.sha1 b/solr/licenses/log4j-1.2-api-2.11.0.jar.sha1
new file mode 100644
index 0000000..662cac2
--- /dev/null
+++ b/solr/licenses/log4j-1.2-api-2.11.0.jar.sha1
@@ -0,0 +1 @@
+5e488f2c717964162016cd5138e2b1ea4dcc379f

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/log4j-1.2.17.jar.sha1
----------------------------------------------------------------------
diff --git a/solr/licenses/log4j-1.2.17.jar.sha1 b/solr/licenses/log4j-1.2.17.jar.sha1
deleted file mode 100644
index 383110e..0000000
--- a/solr/licenses/log4j-1.2.17.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-5af35056b4d257e4b64b9e8069c0746e8b08629f

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/log4j-api-2.11.0.jar.sha1
----------------------------------------------------------------------
diff --git a/solr/licenses/log4j-api-2.11.0.jar.sha1 b/solr/licenses/log4j-api-2.11.0.jar.sha1
new file mode 100644
index 0000000..47ba9da
--- /dev/null
+++ b/solr/licenses/log4j-api-2.11.0.jar.sha1
@@ -0,0 +1 @@
+bede79a3f150711634a3047985517431bf6499f2

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/log4j-api-LICENSE-ASL.txt
----------------------------------------------------------------------
diff --git a/solr/licenses/log4j-api-LICENSE-ASL.txt b/solr/licenses/log4j-api-LICENSE-ASL.txt
new file mode 100644
index 0000000..f49a4e1
--- /dev/null
+++ b/solr/licenses/log4j-api-LICENSE-ASL.txt
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/log4j-api-NOTICE.txt
----------------------------------------------------------------------
diff --git a/solr/licenses/log4j-api-NOTICE.txt b/solr/licenses/log4j-api-NOTICE.txt
new file mode 100644
index 0000000..ebba5ac
--- /dev/null
+++ b/solr/licenses/log4j-api-NOTICE.txt
@@ -0,0 +1,17 @@
+Apache Log4j
+Copyright 1999-2017 Apache Software Foundation
+
+This product includes software developed at
+The Apache Software Foundation (http://www.apache.org/).
+
+ResolverUtil.java
+Copyright 2005-2006 Tim Fennell
+
+Dumbster SMTP test server
+Copyright 2004 Jason Paul Kitchen
+
+TypeUtil.java
+Copyright 2002-2012 Ramnivas Laddad, Juergen Hoeller, Chris Beams
+
+picocli (http://picocli.info)
+Copyright 2017 Remko Popma
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/log4j-core-2.11.0.jar.sha1
----------------------------------------------------------------------
diff --git a/solr/licenses/log4j-core-2.11.0.jar.sha1 b/solr/licenses/log4j-core-2.11.0.jar.sha1
new file mode 100644
index 0000000..59e400d
--- /dev/null
+++ b/solr/licenses/log4j-core-2.11.0.jar.sha1
@@ -0,0 +1 @@
+e6b751e02120c08702d98750f6a80bc25343b7f5

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/log4j-core-LICENSE-ASL.txt
----------------------------------------------------------------------
diff --git a/solr/licenses/log4j-core-LICENSE-ASL.txt b/solr/licenses/log4j-core-LICENSE-ASL.txt
new file mode 100644
index 0000000..f49a4e1
--- /dev/null
+++ b/solr/licenses/log4j-core-LICENSE-ASL.txt
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/log4j-core-NOTICE.txt
----------------------------------------------------------------------
diff --git a/solr/licenses/log4j-core-NOTICE.txt b/solr/licenses/log4j-core-NOTICE.txt
new file mode 100644
index 0000000..ebba5ac
--- /dev/null
+++ b/solr/licenses/log4j-core-NOTICE.txt
@@ -0,0 +1,17 @@
+Apache Log4j
+Copyright 1999-2017 Apache Software Foundation
+
+This product includes software developed at
+The Apache Software Foundation (http://www.apache.org/).
+
+ResolverUtil.java
+Copyright 2005-2006 Tim Fennell
+
+Dumbster SMTP test server
+Copyright 2004 Jason Paul Kitchen
+
+TypeUtil.java
+Copyright 2002-2012 Ramnivas Laddad, Juergen Hoeller, Chris Beams
+
+picocli (http://picocli.info)
+Copyright 2017 Remko Popma
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/log4j-slf4j-LICENSE-ASL.txt
----------------------------------------------------------------------
diff --git a/solr/licenses/log4j-slf4j-LICENSE-ASL.txt b/solr/licenses/log4j-slf4j-LICENSE-ASL.txt
new file mode 100644
index 0000000..f49a4e1
--- /dev/null
+++ b/solr/licenses/log4j-slf4j-LICENSE-ASL.txt
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/log4j-slf4j-NOTICE.txt
----------------------------------------------------------------------
diff --git a/solr/licenses/log4j-slf4j-NOTICE.txt b/solr/licenses/log4j-slf4j-NOTICE.txt
new file mode 100644
index 0000000..ebba5ac
--- /dev/null
+++ b/solr/licenses/log4j-slf4j-NOTICE.txt
@@ -0,0 +1,17 @@
+Apache Log4j
+Copyright 1999-2017 Apache Software Foundation
+
+This product includes software developed at
+The Apache Software Foundation (http://www.apache.org/).
+
+ResolverUtil.java
+Copyright 2005-2006 Tim Fennell
+
+Dumbster SMTP test server
+Copyright 2004 Jason Paul Kitchen
+
+TypeUtil.java
+Copyright 2002-2012 Ramnivas Laddad, Juergen Hoeller, Chris Beams
+
+picocli (http://picocli.info)
+Copyright 2017 Remko Popma
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/log4j-slf4j-impl-2.11.0.jar.sha1
----------------------------------------------------------------------
diff --git a/solr/licenses/log4j-slf4j-impl-2.11.0.jar.sha1 b/solr/licenses/log4j-slf4j-impl-2.11.0.jar.sha1
new file mode 100644
index 0000000..dc5221e
--- /dev/null
+++ b/solr/licenses/log4j-slf4j-impl-2.11.0.jar.sha1
@@ -0,0 +1 @@
+9ba207b78e470fe7765ebee14f1f0336c9cbcc18

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/licenses/slf4j-log4j12-1.7.24.jar.sha1
----------------------------------------------------------------------
diff --git a/solr/licenses/slf4j-log4j12-1.7.24.jar.sha1 b/solr/licenses/slf4j-log4j12-1.7.24.jar.sha1
deleted file mode 100644
index b8ec050..0000000
--- a/solr/licenses/slf4j-log4j12-1.7.24.jar.sha1
+++ /dev/null
@@ -1 +0,0 @@
-309d7b29b14573c05d4c69cc7e44da0cb17212d3

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/server/README.txt
----------------------------------------------------------------------
diff --git a/solr/server/README.txt b/solr/server/README.txt
index 228f4d4..8c6fa3d 100644
--- a/solr/server/README.txt
+++ b/solr/server/README.txt
@@ -47,7 +47,7 @@ server/logs
 
 server/resources
 
-  Contains configuration files, such as the Log4j configuration (log4j.properties) for configuring Solr loggers.
+  Contains configuration files, such as the Log4j configuration (log4j2.xml) for configuring Solr loggers.
 
 server/scripts/cloud-scripts
 
@@ -102,7 +102,7 @@ solrconfig.xml.
 
 By default, Jetty & Solr will log to the console and logs/solr.log. This can
 be convenient when first getting started, but eventually you will want to
-log just to a file. To configure logging, edit the log4j.properties file in
+log just to a file. To configure logging, edit the log4j2.xml file in
 "resources".
  
 It is also possible to setup log4j or other popular logging frameworks.

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/server/ivy.xml
----------------------------------------------------------------------
diff --git a/solr/server/ivy.xml b/solr/server/ivy.xml
index c9b3a73..cf7832a 100644
--- a/solr/server/ivy.xml
+++ b/solr/server/ivy.xml
@@ -27,11 +27,14 @@
   </configurations>
 
   <dependencies>
-    <dependency org="log4j" name="log4j" rev="${/log4j/log4j}" conf="logging"/>
+    <dependency org="org.apache.logging.log4j" name="log4j-api" rev="${/org.apache.logging.log4j/log4j-api}" conf="logging"/>
+    <dependency org="org.apache.logging.log4j" name="log4j-core" rev="${/org.apache.logging.log4j/log4j-core}" conf="logging"/>
+    <dependency org="org.apache.logging.log4j" name="log4j-slf4j-impl" rev="${/org.apache.logging.log4j/log4j-slf4j-impl}" conf="logging"/>
+    <dependency org="org.apache.logging.log4j" name="log4j-1.2-api" rev="${/org.apache.logging.log4j/log4j-1.2-api}" conf="logging"/>
+    <dependency org="com.lmax" name="disruptor" rev="${/com.lmax/disruptor}" conf="logging"/>
     <dependency org="org.slf4j" name="slf4j-api" rev="${/org.slf4j/slf4j-api}" conf="logging"/>
     <dependency org="org.slf4j" name="jcl-over-slf4j" rev="${/org.slf4j/jcl-over-slf4j}" conf="logging"/>
-    <dependency org="org.slf4j" name="jul-to-slf4j" rev="${/org.slf4j/jul-to-slf4j}" conf="logging"/> 
-    <dependency org="org.slf4j" name="slf4j-log4j12" rev="${/org.slf4j/slf4j-log4j12}" conf="logging"/>
+    <dependency org="org.slf4j" name="jul-to-slf4j" rev="${/org.slf4j/jul-to-slf4j}" conf="logging"/>
 
     <dependency org="io.dropwizard.metrics" name="metrics-core" rev="${/io.dropwizard.metrics/metrics-core}" conf="metrics" />
     <dependency org="io.dropwizard.metrics" name="metrics-jetty9" rev="${/io.dropwizard.metrics/metrics-jetty9}" conf="metrics" />

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/server/resources/log4j.properties
----------------------------------------------------------------------
diff --git a/solr/server/resources/log4j.properties b/solr/server/resources/log4j.properties
deleted file mode 100644
index c0ed34c..0000000
--- a/solr/server/resources/log4j.properties
+++ /dev/null
@@ -1,29 +0,0 @@
-# Default Solr log4j config
-# rootLogger log level may be programmatically overridden by -Dsolr.log.level
-solr.log=${solr.log.dir}
-log4j.rootLogger=INFO, file, CONSOLE
-
-# Console appender will be programmatically disabled when Solr is started with option -Dsolr.log.muteconsole
-log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
-log4j.appender.CONSOLE.layout=org.apache.log4j.EnhancedPatternLayout
-log4j.appender.CONSOLE.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss.SSS} %-5p (%t) [%X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
-
-#- size rotation with log cleanup.
-log4j.appender.file=org.apache.log4j.RollingFileAppender
-log4j.appender.file.MaxFileSize=32MB
-log4j.appender.file.MaxBackupIndex=10
-
-#- File to log to and log format
-log4j.appender.file.File=${solr.log}/solr.log
-log4j.appender.file.layout=org.apache.log4j.EnhancedPatternLayout
-log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss.SSS} %-5p (%t) [%X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
-
-# Adjust logging levels that should differ from root logger
-log4j.logger.org.apache.zookeeper=WARN
-log4j.logger.org.apache.hadoop=WARN
-log4j.logger.org.eclipse.jetty=WARN
-log4j.logger.org.eclipse.jetty.server.Server=INFO
-log4j.logger.org.eclipse.jetty.server.ServerConnector=INFO
-
-# set to INFO to enable infostream log messages
-log4j.logger.org.apache.solr.update.LoggingInfoStream=OFF

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/server/resources/log4j2.xml
----------------------------------------------------------------------
diff --git a/solr/server/resources/log4j2.xml b/solr/server/resources/log4j2.xml
new file mode 100644
index 0000000..c8b162a
--- /dev/null
+++ b/solr/server/resources/log4j2.xml
@@ -0,0 +1,53 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<Configuration>
+  <Appenders>
+    <Console name="STDOUT" target="SYSTEM_OUT">
+      <PatternLayout>
+        <Pattern>
+          %d{yyyy-MM-dd HH:mm:ss.SSS} %-5p (%t) [%X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
+        </Pattern>
+      </PatternLayout>
+    </Console>
+    <RollingFile
+        name="RollingFile"
+        fileName="${sys:solr.solr.home}/../logs/solr.log"
+        filePattern="${sys:solr.solr.home}/../logs/solr.%i.log.gz" >
+      <PatternLayout>
+        <Pattern>
+          %d{yyyy-MM-dd HH:mm:ss.SSS} %-5p (%t) [%X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
+        </Pattern>
+      </PatternLayout>
+      <Policies>
+        <OnStartupTriggeringPolicy />
+        <SizeBasedTriggeringPolicy size="4 MB"/>
+      </Policies>
+    </RollingFile>
+  </Appenders>
+  <Loggers>
+    <Logger name="org.apache.hadoop" level="warn"/>
+    <Logger name="org.apache.solr.update.LoggingInfoStream" level="off"/>
+    <Logger name="org.apache.zookeeper" level="warn"/>
+
+    <Root level="info">
+      <AppenderRef ref="RollingFile"/>
+      <AppenderRef ref="STDOUT"/>
+    </Root>
+  </Loggers>
+</Configuration>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/server/scripts/cloud-scripts/log4j.properties
----------------------------------------------------------------------
diff --git a/solr/server/scripts/cloud-scripts/log4j.properties b/solr/server/scripts/cloud-scripts/log4j.properties
deleted file mode 100644
index 5f2ae18..0000000
--- a/solr/server/scripts/cloud-scripts/log4j.properties
+++ /dev/null
@@ -1,12 +0,0 @@
-#  Logging level
-log4j.rootLogger=INFO, stderr
-
-# log to stderr
-log4j.appender.stderr = org.apache.log4j.ConsoleAppender
-log4j.appender.stderr.Target = System.err
-log4j.appender.stderr.layout = org.apache.log4j.PatternLayout
-log4j.appender.stderr.layout.ConversionPattern=%-5p - %d{yyyy-MM-dd HH:mm:ss.SSS}; %C; %m%n
-
-# quiet down the ZK logging for cli tools
-log4j.logger.org.apache.zookeeper=WARN
-log4j.logger.org.apache.solr.common.cloud=WARN

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/server/scripts/cloud-scripts/log4j2.xml
----------------------------------------------------------------------
diff --git a/solr/server/scripts/cloud-scripts/log4j2.xml b/solr/server/scripts/cloud-scripts/log4j2.xml
new file mode 100644
index 0000000..b06ed81
--- /dev/null
+++ b/solr/server/scripts/cloud-scripts/log4j2.xml
@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<Configuration>
+  <Appenders>
+    <Console name="STDERR" target="SYSTEM_ERR">
+      <PatternLayout>
+        <Pattern>
+          %-5p - %d{yyyy-MM-dd HH:mm:ss.SSS}; %c; %m%n
+        </Pattern>
+      </PatternLayout>
+    </Console>
+  </Appenders>
+  <Loggers>
+    <Logger name="org.apache.zookeeper" level="WARN"/>
+    <Logger name="log4j.logger.org.apache.solr.common.cloud" level="WARN"/>
+
+    <Root level="INFO">
+      <AppenderRef ref="STDERR"/>
+    </Root>
+  </Loggers>
+</Configuration>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/server/scripts/cloud-scripts/snapshotscli.sh
----------------------------------------------------------------------
diff --git a/solr/server/scripts/cloud-scripts/snapshotscli.sh b/solr/server/scripts/cloud-scripts/snapshotscli.sh
index f885721..59f6a94 100755
--- a/solr/server/scripts/cloud-scripts/snapshotscli.sh
+++ b/solr/server/scripts/cloud-scripts/snapshotscli.sh
@@ -8,9 +8,9 @@ run_solr_snapshot_tool() {
   if [ -n "$LOG4J_PROPS" ]; then
     log4j_config="file:${LOG4J_PROPS}"
   else
-    log4j_config="file:${scriptDir}/log4j.properties"
+    log4j_config="file:${scriptDir}/log4j2.xml"
   fi
-  PATH=${JAVA_HOME}/bin:${PATH} ${JVM} ${ZKCLI_JVM_FLAGS} -Dlog4j.configuration=${log4j_config} \
+  PATH=${JAVA_HOME}/bin:${PATH} ${JVM} ${ZKCLI_JVM_FLAGS} -Dlog4j.configurationFile=${log4j_config} \
   -classpath "${solrLibPath}" org.apache.solr.core.snapshots.SolrSnapshotsTool "$@" 2> /dev/null
 }
 

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/server/scripts/cloud-scripts/zkcli.bat
----------------------------------------------------------------------
diff --git a/solr/server/scripts/cloud-scripts/zkcli.bat b/solr/server/scripts/cloud-scripts/zkcli.bat
index c5d7b72..7187b20 100644
--- a/solr/server/scripts/cloud-scripts/zkcli.bat
+++ b/solr/server/scripts/cloud-scripts/zkcli.bat
@@ -12,7 +12,7 @@ if "%SDIR:~-1%"=="\" set SDIR=%SDIR:~0,-1%
 if defined LOG4J_PROPS (
   set "LOG4J_CONFIG=file:%LOG4J_PROPS%"
 ) else (
-  set "LOG4J_CONFIG=file:%SDIR%\log4j.properties"
+  set "LOG4J_CONFIG=file:%SDIR%\log4j2.xml"
 )
 
 REM Settings for ZK ACL
@@ -21,5 +21,5 @@ REM  -DzkCredentialsProvider=org.apache.solr.common.cloud.VMParamsSingleSetCrede
 REM  -DzkDigestUsername=admin-user -DzkDigestPassword=CHANGEME-ADMIN-PASSWORD ^
 REM  -DzkDigestReadonlyUsername=readonly-user -DzkDigestReadonlyPassword=CHANGEME-READONLY-PASSWORD
 
-"%JVM%" %SOLR_ZK_CREDS_AND_ACLS% %ZKCLI_JVM_FLAGS% -Dlog4j.configuration="%LOG4J_CONFIG%" ^
+"%JVM%" %SOLR_ZK_CREDS_AND_ACLS% %ZKCLI_JVM_FLAGS% -Dlog4j.configurationFile="%LOG4J_CONFIG%" ^
 -classpath "%SDIR%\..\..\solr-webapp\webapp\WEB-INF\lib\*;%SDIR%\..\..\lib\ext\*;%SDIR%\..\..\lib\*" org.apache.solr.cloud.ZkCLI %*

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/server/scripts/cloud-scripts/zkcli.sh
----------------------------------------------------------------------
diff --git a/solr/server/scripts/cloud-scripts/zkcli.sh b/solr/server/scripts/cloud-scripts/zkcli.sh
index bd971e9..97df2d4 100755
--- a/solr/server/scripts/cloud-scripts/zkcli.sh
+++ b/solr/server/scripts/cloud-scripts/zkcli.sh
@@ -12,7 +12,7 @@ sdir="`dirname \"$0\"`"
 if [ -n "$LOG4J_PROPS" ]; then
   log4j_config="file:$LOG4J_PROPS"
 else
-  log4j_config="file:$sdir/log4j.properties"
+  log4j_config="file:$sdir/log4j2.xml"
 fi
 
 # Settings for ZK ACL
@@ -21,6 +21,6 @@ fi
 #  -DzkDigestUsername=admin-user -DzkDigestPassword=CHANGEME-ADMIN-PASSWORD \
 #  -DzkDigestReadonlyUsername=readonly-user -DzkDigestReadonlyPassword=CHANGEME-READONLY-PASSWORD"
 
-PATH=$JAVA_HOME/bin:$PATH $JVM $SOLR_ZK_CREDS_AND_ACLS $ZKCLI_JVM_FLAGS -Dlog4j.configuration=$log4j_config \
+PATH=$JAVA_HOME/bin:$PATH $JVM $SOLR_ZK_CREDS_AND_ACLS $ZKCLI_JVM_FLAGS -Dlog4j.configurationFile=$log4j_config \
 -classpath "$sdir/../../solr-webapp/webapp/WEB-INF/lib/*:$sdir/../../lib/ext/*:$sdir/../../lib/*" org.apache.solr.cloud.ZkCLI ${1+"$@"}
 

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/server/solr/configsets/sample_techproducts_configs/conf/solrconfig.xml
----------------------------------------------------------------------
diff --git a/solr/server/solr/configsets/sample_techproducts_configs/conf/solrconfig.xml b/solr/server/solr/configsets/sample_techproducts_configs/conf/solrconfig.xml
index 1b25636..a28da09 100644
--- a/solr/server/solr/configsets/sample_techproducts_configs/conf/solrconfig.xml
+++ b/solr/server/solr/configsets/sample_techproducts_configs/conf/solrconfig.xml
@@ -247,7 +247,7 @@
 
          Setting the value to true will instruct the underlying Lucene
          IndexWriter to write its info stream to solr's log. By default,
-         this is enabled here, and controlled through log4j.properties.
+         this is enabled here, and controlled through log4j2.xml
       -->
      <infoStream>true</infoStream>
   </indexConfig>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/solr-ref-guide/ivy.xml
----------------------------------------------------------------------
diff --git a/solr/solr-ref-guide/ivy.xml b/solr/solr-ref-guide/ivy.xml
index adefe2c..d9377e2 100644
--- a/solr/solr-ref-guide/ivy.xml
+++ b/solr/solr-ref-guide/ivy.xml
@@ -29,6 +29,8 @@
     <dependency org="org.slf4j" name="jcl-over-slf4j" rev="${/org.slf4j/jcl-over-slf4j}" conf="compile"/>
     <dependency org="org.slf4j" name="slf4j-api" rev="${/org.slf4j/slf4j-api}" conf="compile"/>
     <dependency org="org.slf4j" name="slf4j-simple" rev="${/org.slf4j/slf4j-simple}" conf="compile"/>
-    <dependency org="log4j" name="log4j" rev="${/log4j/log4j}" conf="compile"/>
+    <dependency org="org.apache.logging.log4j" name="log4j-api" rev="${/org.apache.logging.log4j/log4j-api}" conf="compile"/>
+    <dependency org="org.apache.logging.log4j" name="log4j-core" rev="${/org.apache.logging.log4j/log4j-core}" conf="compile"/>
+
   </dependencies>
 </ivy-module>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/solr-ref-guide/src/configuring-logging.adoc
----------------------------------------------------------------------
diff --git a/solr/solr-ref-guide/src/configuring-logging.adoc b/solr/solr-ref-guide/src/configuring-logging.adoc
index dc76d0b..15e47c9 100644
--- a/solr/solr-ref-guide/src/configuring-logging.adoc
+++ b/solr/solr-ref-guide/src/configuring-logging.adoc
@@ -86,11 +86,11 @@ bin/solr start -f -q
 
 Solr uses http://logging.apache.org/log4j/{ivy-log4j-version}/[Log4J version {ivy-log4j-version}] for logging which is configured using `server/resources/log4j.properties`. Take a moment to inspect the contents of the `log4j.properties` file so that you are familiar with its structure. By default, Solr log messages will be written to `SOLR_LOGS_DIR/solr.log`.
 
-When you're ready to deploy Solr in production, set the variable `SOLR_LOGS_DIR` to the location where you want Solr to write log files, such as `/var/solr/logs`. You may also want to tweak `log4j.properties`. Note that if you installed Solr as a service using the instructions provided in <<taking-solr-to-production.adoc#taking-solr-to-production,Taking Solr to Production>>, then see `/var/solr/log4j.properties` instead of the default `server/resources` version.
+When you're ready to deploy Solr in production, set the variable `SOLR_LOGS_DIR` to the location where you want Solr to write log files, such as `/var/solr/logs`. You may also want to tweak `log4j2.xml`. Note that if you installed Solr as a service using the instructions provided in <<taking-solr-to-production.adoc#taking-solr-to-production,Taking Solr to Production>>, then see `/var/solr/log4j2.xml` instead of the default `server/resources` version.
 
-When starting Solr in the foreground (`-f` option), all logs will be sent to the console, in addition to `solr.log`. When starting Solr in the background, it will write all `stdout` and `stderr` output to a log file in `solr-<port>-console.log`, and automatically disable the CONSOLE logger configured in `log4j.properties`, having the same effect as if you removed the CONSOLE appender from the rootLogger manually.
+When starting Solr in the foreground (`-f` option), all logs will be sent to the console, in addition to `solr.log`. When starting Solr in the background, it will write all `stdout` and `stderr` output to a log file in `solr-<port>-console.log`, and automatically disable the CONSOLE logger configured in `log4j2.xml`, having the same effect as if you removed the CONSOLE appender from the rootLogger manually.
 
-Also, in `log4j.properties` if the default log rotation size threshold of 32MB is too small for production servers then you should increase it to a larger value (such as 100MB or more).
+Also, in `log4j2.xml` if the default log rotation size threshold of 32MB is too small for production servers then you should increase it to a larger value (such as 100MB or more).
 
 [source,text]
 ----
@@ -99,7 +99,7 @@ log4j.appender.file.MaxFileSize=100MB
 
 Java Garbage Collection logs are rotated by the JVM when size hits 20M, for a max of 9 generations. Old GC logs are moved to `SOLR_LOGS_DIR/archived`. These settings can only be changed by editing the start scripts.
 
-On every startup of Solr, the start script will clean up old logs and rotate the main `solr.log` file. If you changed the `log4j.appender.file.MaxBackupIndex` setting in `log4j.properties`, you also need to change the corresponding setting `-rotate_solr_logs 10` in the start script.
+On every startup of Solr, the start script will clean up old logs and rotate the main `solr.log` file. If you changed the `log4j.appender.file.MaxBackupIndex` setting in `log4j2.xml`, you also need to change the corresponding setting `-rotate_solr_logs 10` in the start script.
 
 You can disable the automatic log rotation at startup by changing the setting `SOLR_LOG_PRESTART_ROTATION` found in `bin/solr.in.sh` or `bin/solr.in.cmd` to false.
 

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/solr-ref-guide/src/solr-control-script-reference.adoc
----------------------------------------------------------------------
diff --git a/solr/solr-ref-guide/src/solr-control-script-reference.adoc b/solr/solr-ref-guide/src/solr-control-script-reference.adoc
index d039a31..4f3eb45 100644
--- a/solr/solr-ref-guide/src/solr-control-script-reference.adoc
+++ b/solr/solr-ref-guide/src/solr-control-script-reference.adoc
@@ -122,12 +122,12 @@ This parameter is ignored when running examples (`-e`), as the `solr.solr.home`
 *Example*: `bin/solr start -s newHome`
 
 `-v`::
-Be more verbose. This changes the logging level of log4j from `INFO` to `DEBUG`, having the same effect as if you edited `log4j.properties` accordingly.
+Be more verbose. This changes the logging level of log4j from `INFO` to `DEBUG`, having the same effect as if you edited `log4j2.xml` accordingly.
 +
 *Example*: `bin/solr start -f -v`
 
 `-q`::
-Be more quiet. This changes the logging level of log4j from `INFO` to `WARN`, having the same effect as if you edited `log4j.properties` accordingly. This can be useful in a production setting where you want to limit logging to warnings and errors.
+Be more quiet. This changes the logging level of log4j from `INFO` to `WARN`, having the same effect as if you edited `log4j2.xml` accordingly. This can be useful in a production setting where you want to limit logging to warnings and errors.
 +
 *Example*: `bin/solr start -f -q`
 


[3/3] lucene-solr:master: SOLR-7887: Upgrade Solr to use log4j2 -- log4j 1 now officially end of life

Posted by er...@apache.org.
SOLR-7887: Upgrade Solr to use log4j2 -- log4j 1 now officially end of life


Project: http://git-wip-us.apache.org/repos/asf/lucene-solr/repo
Commit: http://git-wip-us.apache.org/repos/asf/lucene-solr/commit/624d128b
Tree: http://git-wip-us.apache.org/repos/asf/lucene-solr/tree/624d128b
Diff: http://git-wip-us.apache.org/repos/asf/lucene-solr/diff/624d128b

Branch: refs/heads/master
Commit: 624d128b5e745d88adb54bc8505e96cdf6156209
Parents: 4bb02d8
Author: Erick Erickson <er...@apache.org>
Authored: Sun Mar 25 19:16:09 2018 -0700
Committer: Erick Erickson <er...@apache.org>
Committed: Sun Mar 25 19:16:09 2018 -0700

----------------------------------------------------------------------
 lucene/common-build.xml                         |   3 +-
 lucene/ivy-versions.properties                  |  12 +-
 solr/CHANGES.txt                                |   5 +
 solr/bin/install_solr_service.sh                |   8 +-
 solr/bin/solr                                   |   8 +-
 solr/bin/solr.cmd                               |  52 ++--
 solr/bin/solr.in.cmd                            |   2 +-
 solr/bin/solr.in.sh                             |   8 +-
 .../clustering/src/test-files/log4j.properties  |  10 -
 .../clustering/src/test-files/log4j2.xml        |  37 +++
 .../src/test-files/log4j.properties             |   9 -
 .../dataimporthandler/src/test-files/log4j2.xml |  36 +++
 .../contrib/ltr/src/test-files/log4j.properties |  32 --
 solr/contrib/ltr/src/test-files/log4j2.xml      |  41 +++
 solr/contrib/prometheus-exporter/ivy.xml        |   5 +-
 solr/core/ivy.xml                               |   8 +-
 .../client/solrj/embedded/JettySolrRunner.java  |   2 +-
 .../solr/handler/admin/LoggingHandler.java      |   4 +-
 .../org/apache/solr/logging/LogWatcher.java     |  16 +-
 .../solr/logging/log4j/EventAppender.java       |  48 ---
 .../apache/solr/logging/log4j/Log4jInfo.java    |  52 ----
 .../apache/solr/logging/log4j/Log4jWatcher.java | 171 -----------
 .../apache/solr/logging/log4j/package-info.java |  23 --
 .../solr/logging/log4j2/Log4j2Watcher.java      | 289 +++++++++++++++++++
 .../solr/logging/log4j2/package-info.java       |  22 ++
 .../apache/solr/servlet/SolrDispatchFilter.java |   1 +
 .../src/java/org/apache/solr/util/SolrCLI.java  |   2 +-
 .../org/apache/solr/util/SolrLogLayout.java     |  69 +++--
 .../apache/solr/util/StartupLoggingUtils.java   |  39 ++-
 solr/core/src/test-files/log4j.properties       |  38 ---
 solr/core/src/test-files/log4j2.xml             |  39 +++
 .../apache/solr/handler/RequestLoggingTest.java |  42 ++-
 .../solr/handler/admin/LoggingHandlerTest.java  |  34 ++-
 .../org/apache/solr/logging/TestLogWatcher.java |  21 ++
 .../reporters/SolrSlf4jReporterTest.java        |   7 +-
 .../apache/solr/util/TestSolrCLIRunExample.java |   3 +
 solr/example/README.txt                         |   2 +-
 .../example-DIH/solr/db/conf/solrconfig.xml     |   2 +-
 .../example-DIH/solr/mail/conf/solrconfig.xml   |   2 +-
 .../example-DIH/solr/solr/conf/solrconfig.xml   |   2 +-
 solr/example/resources/log4j.properties         |  24 --
 solr/example/resources/log4j2.xml               |  53 ++++
 solr/licenses/disruptor-3.4.0.jar.sha1          |   1 +
 solr/licenses/disruptor-LICENSE-ASL.txt         | 201 +++++++++++++
 solr/licenses/disruptor-NOTICE.txt              |   0
 solr/licenses/log4j-1.2-api-2.11.0.jar.sha1     |   1 +
 solr/licenses/log4j-1.2.17.jar.sha1             |   1 -
 solr/licenses/log4j-api-2.11.0.jar.sha1         |   1 +
 solr/licenses/log4j-api-LICENSE-ASL.txt         | 201 +++++++++++++
 solr/licenses/log4j-api-NOTICE.txt              |  17 ++
 solr/licenses/log4j-core-2.11.0.jar.sha1        |   1 +
 solr/licenses/log4j-core-LICENSE-ASL.txt        | 201 +++++++++++++
 solr/licenses/log4j-core-NOTICE.txt             |  17 ++
 solr/licenses/log4j-slf4j-LICENSE-ASL.txt       | 201 +++++++++++++
 solr/licenses/log4j-slf4j-NOTICE.txt            |  17 ++
 solr/licenses/log4j-slf4j-impl-2.11.0.jar.sha1  |   1 +
 solr/licenses/slf4j-log4j12-1.7.24.jar.sha1     |   1 -
 solr/server/README.txt                          |   4 +-
 solr/server/ivy.xml                             |   9 +-
 solr/server/resources/log4j.properties          |  29 --
 solr/server/resources/log4j2.xml                |  53 ++++
 .../scripts/cloud-scripts/log4j.properties      |  12 -
 solr/server/scripts/cloud-scripts/log4j2.xml    |  37 +++
 .../scripts/cloud-scripts/snapshotscli.sh       |   4 +-
 solr/server/scripts/cloud-scripts/zkcli.bat     |   4 +-
 solr/server/scripts/cloud-scripts/zkcli.sh      |   4 +-
 .../conf/solrconfig.xml                         |   2 +-
 solr/solr-ref-guide/ivy.xml                     |   4 +-
 .../solr-ref-guide/src/configuring-logging.adoc |   8 +-
 .../src/solr-control-script-reference.adoc      |   4 +-
 .../src/taking-solr-to-production.adoc          |   4 +-
 solr/solrj/ivy.xml                              |   2 +-
 solr/solrj/src/test-files/log4j.properties      |  32 --
 solr/solrj/src/test-files/log4j2.xml            |  39 +++
 .../java/org/apache/solr/SolrTestCaseJ4.java    |   9 +-
 .../src/java/org/apache/solr/util/LogLevel.java |  47 +--
 .../src/test-files/log4j.properties             |  11 -
 solr/test-framework/src/test-files/log4j2.xml   |  39 +++
 .../apache/solr/TestLogLevelAnnotations.java    |  16 +-
 79 files changed, 1838 insertions(+), 680 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/lucene/common-build.xml
----------------------------------------------------------------------
diff --git a/lucene/common-build.xml b/lucene/common-build.xml
index 86e4288..1061a54 100644
--- a/lucene/common-build.xml
+++ b/lucene/common-build.xml
@@ -187,7 +187,8 @@
   <property name="javadoc.noindex" value="true"/>
 
   <property name="javadoc.doclint.args" value="-Xdoclint:all -Xdoclint:-missing"/>
-  <property name="javac.doclint.args" value="-Xdoclint:all/protected -Xdoclint:-missing"/>
+  <!---proc:none was added because of LOG4J2-1925 / JDK-8186647 -->
+  <property name="javac.doclint.args" value="-Xdoclint:all/protected -Xdoclint:-missing -proc:none"/>
   
   <!-- Javadoc classpath -->
   <path id="javadoc.classpath">

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/lucene/ivy-versions.properties
----------------------------------------------------------------------
diff --git a/lucene/ivy-versions.properties b/lucene/ivy-versions.properties
index afbab20..58d21d0 100644
--- a/lucene/ivy-versions.properties
+++ b/lucene/ivy-versions.properties
@@ -32,6 +32,7 @@ com.fasterxml.jackson.core.version = 2.5.4
 /com.healthmarketscience.jackcess/jackcess = 2.1.8
 /com.healthmarketscience.jackcess/jackcess-encrypt = 2.1.4
 /com.ibm.icu/icu4j = 59.1
+/com.lmax/disruptor = 3.4.0
 /com.pff/java-libpst = 0.8.1
 
 com.rometools.version = 1.5.1
@@ -84,8 +85,9 @@ io.prometheus.version = 0.2.0
 /junit/junit = 4.10
 
 # NOTE: split out from the full version to also use as solr-ref-guide attribute
-org.log4j.major.version = 1.2
-/log4j/log4j = ${org.log4j.major.version}.17
+org.log4j.major.version = 2.11
+org.log4j.minor.version = 0
+org.apache.logging.log4j.version = ${org.log4j.major.version}.${org.log4j.minor.version}
 
 /mecab/mecab-ipadic = 2.7.0-20070801
 /mecab/mecab-naist-jdic = 0.6.3b-20111013
@@ -180,6 +182,11 @@ org.apache.james.apache.mime4j.version = 0.8.1
 /org.apache.james/apache-mime4j-core = ${org.apache.james.apache.mime4j.version}
 /org.apache.james/apache-mime4j-dom = ${org.apache.james.apache.mime4j.version}
 
+/org.apache.logging.log4j/log4j-1.2-api = ${org.apache.logging.log4j.version}
+/org.apache.logging.log4j/log4j-api = ${org.apache.logging.log4j.version}
+/org.apache.logging.log4j/log4j-core = ${org.apache.logging.log4j.version}
+/org.apache.logging.log4j/log4j-slf4j-impl = ${org.apache.logging.log4j.version}
+
 /org.apache.mina/mina-core = 2.0.0-M5
 
 /org.apache.opennlp/opennlp-maxent = 3.0.3
@@ -301,7 +308,6 @@ org.slf4j.version = 1.7.24
 /org.slf4j/jcl-over-slf4j = ${org.slf4j.version}
 /org.slf4j/jul-to-slf4j = ${org.slf4j.version}
 /org.slf4j/slf4j-api = ${org.slf4j.version}
-/org.slf4j/slf4j-log4j12 = ${org.slf4j.version}
 /org.slf4j/slf4j-simple = ${org.slf4j.version}
 
 /org.tallison/jmatio = 1.2

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/CHANGES.txt
----------------------------------------------------------------------
diff --git a/solr/CHANGES.txt b/solr/CHANGES.txt
index 9268315..865fecf 100644
--- a/solr/CHANGES.txt
+++ b/solr/CHANGES.txt
@@ -166,6 +166,9 @@ Upgrade Notes
   from the earlier default of 30 seconds. This affects how soon Solr adds new replicas to replace the replicas
   on nodes which have either crashed or shutdown.
 
+* SOLR-7887: Solr now uses Log4J 2.10. The log4j configuration is now in log4j2.xml rather than lo4j.properties
+  files (Shawn Heisey, Keith Laban, Timothy Potter, Varun Thacker, Erick Erickson,
+
 New Features
 ----------------------
 * SOLR-11285: Simulation framework for autoscaling. (ab)
@@ -489,6 +492,8 @@ Other Changes
 * SOLR-12097: Document the diskType policy attribute and usage of disk space in Collection APIs.
   (Cassandra Targett, shalin)
 
+* SOLR-7887: Upgrade Solr to Log4J 2.10 (Tim Potter, Keith Laban, Shawn Heisey, Ralph Goers, Varun Thacker)
+
 ==================  7.2.1 ==================
 
 Consult the LUCENE_CHANGES.txt file for additional, low level, changes in this release.

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/bin/install_solr_service.sh
----------------------------------------------------------------------
diff --git a/solr/bin/install_solr_service.sh b/solr/bin/install_solr_service.sh
index b829571..033b383 100755
--- a/solr/bin/install_solr_service.sh
+++ b/solr/bin/install_solr_service.sh
@@ -326,7 +326,7 @@ else
   mv "$SOLR_INSTALL_DIR/bin/solr.in.cmd" "$SOLR_INSTALL_DIR/bin/solr.in.cmd.orig"  
   echo "SOLR_PID_DIR=\"$SOLR_VAR_DIR\"
 SOLR_HOME=\"$SOLR_VAR_DIR/data\"
-LOG4J_PROPS=\"$SOLR_VAR_DIR/log4j.properties\"
+LOG4J_PROPS=\"$SOLR_VAR_DIR/log4j2.xml\"
 SOLR_LOGS_DIR=\"$SOLR_VAR_DIR/logs\"
 SOLR_PORT=\"$SOLR_PORT\"
 " >> "/etc/default/$SOLR_SERVICE.in.sh"
@@ -342,10 +342,10 @@ if [ -f "$SOLR_VAR_DIR/data/solr.xml" ]; then
 else
   cp "$SOLR_INSTALL_DIR/server/solr/"{solr.xml,zoo.cfg} "$SOLR_VAR_DIR/data/"
 fi
-if [ -f "$SOLR_VAR_DIR/log4j.properties" ]; then
-  echo -e "\n$SOLR_VAR_DIR/log4j.properties already exists. Skipping install ...\n"
+if [ -f "$SOLR_VAR_DIR/log4j2.xml" ]; then
+  echo -e "\n$SOLR_VAR_DIR/log4j2.xml already exists. Skipping install ...\n"
 else
-  cp "$SOLR_INSTALL_DIR/server/resources/log4j.properties" "$SOLR_VAR_DIR/log4j.properties"
+  cp "$SOLR_INSTALL_DIR/server/resources/log4j2.xml" "$SOLR_VAR_DIR/log4j2.xml"
 fi
 chown -R "$SOLR_USER:" "$SOLR_VAR_DIR"
 find "$SOLR_VAR_DIR" -type d -print0 | xargs -0 chmod 0750

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/bin/solr
----------------------------------------------------------------------
diff --git a/solr/bin/solr b/solr/bin/solr
index 47861ad..e05d570 100755
--- a/solr/bin/solr
+++ b/solr/bin/solr
@@ -681,7 +681,7 @@ function jetty_port() {
 function run_tool() {
 
   "$JAVA" $SOLR_SSL_OPTS $AUTHC_OPTS $SOLR_ZK_CREDS_AND_ACLS -Dsolr.install.dir="$SOLR_TIP" \
-    -Dlog4j.configuration="file:$DEFAULT_SERVER_DIR/scripts/cloud-scripts/log4j.properties" \
+    -Dlog4j.configurationFile="file:$DEFAULT_SERVER_DIR/scripts/cloud-scripts/log4j2.xml" \
     -classpath "$DEFAULT_SERVER_DIR/solr-webapp/webapp/WEB-INF/lib/*:$DEFAULT_SERVER_DIR/lib/ext/*" \
     org.apache.solr.util.SolrCLI "$@"
 
@@ -1783,20 +1783,20 @@ if [ -z "$DEFAULT_CONFDIR" ]; then
   DEFAULT_CONFDIR="$SOLR_SERVER_DIR/solr/configsets/_default/conf"
 fi
 
-# This is quite hacky, but examples rely on a different log4j.properties
+# This is quite hacky, but examples rely on a different log4j2.xml
 # so that we can write logs for examples to $SOLR_HOME/../logs
 if [ -z "$SOLR_LOGS_DIR" ]; then
   SOLR_LOGS_DIR="$SOLR_SERVER_DIR/logs"
 fi
 EXAMPLE_DIR="$SOLR_TIP/example"
 if [ "${SOLR_HOME:0:${#EXAMPLE_DIR}}" = "$EXAMPLE_DIR" ]; then
-  LOG4J_PROPS="$EXAMPLE_DIR/resources/log4j.properties"
+  LOG4J_PROPS="$EXAMPLE_DIR/resources/log4j2.xml"
   SOLR_LOGS_DIR="$SOLR_HOME/../logs"
 fi
 
 LOG4J_CONFIG=()
 if [ -n "$LOG4J_PROPS" ]; then
-  LOG4J_CONFIG+=("-Dlog4j.configuration=file:$LOG4J_PROPS")
+  LOG4J_CONFIG+=("-Dlog4j.configurationFile=file:$LOG4J_PROPS")
 fi
 
 if [ "$SCRIPT_CMD" == "stop" ]; then

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/bin/solr.cmd
----------------------------------------------------------------------
diff --git a/solr/bin/solr.cmd b/solr/bin/solr.cmd
index dcff0c6..ab32d23 100644
--- a/solr/bin/solr.cmd
+++ b/solr/bin/solr.cmd
@@ -935,7 +935,7 @@ IF NOT EXIST "%SOLR_HOME%\" (
 
 IF "%STOP_KEY%"=="" set STOP_KEY=solrrocks
 
-@REM This is quite hacky, but examples rely on a different log4j.properties
+@REM This is quite hacky, but examples rely on a different log4j2.xml
 @REM so that we can write logs for examples to %SOLR_HOME%\..\logs
 IF [%SOLR_LOGS_DIR%] == [] (
   set "SOLR_LOGS_DIR=%SOLR_SERVER_DIR%\logs"
@@ -949,7 +949,7 @@ set "EXAMPLE_DIR=%SOLR_TIP%\example"
 set TMP=!SOLR_HOME:%EXAMPLE_DIR%=!
 IF NOT "%TMP%"=="%SOLR_HOME%" (
   set "SOLR_LOGS_DIR=%SOLR_HOME%\..\logs"
-  set "LOG4J_CONFIG=file:%EXAMPLE_DIR%\resources\log4j.properties"
+  set "LOG4J_CONFIG=file:%EXAMPLE_DIR%\resources\log4j2.xml"
 )
 
 set IS_RESTART=0
@@ -977,7 +977,7 @@ IF "%SCRIPT_CMD%"=="stop" (
               IF "%%j"=="%SOLR_JETTY_HOST%:!SOME_SOLR_PORT!" (
                 set found_it=1
                 @echo Stopping Solr process %%k running on port !SOME_SOLR_PORT!
-                IF "%STOP_PORT%"=="" set /A STOP_PORT=!SOME_SOLR_PORT! - 1000
+                IF "%STOP_PORT%"=="" set /A STOP_PORT=!SOME_SOLR_PORT! - 1000
                 "%JAVA%" %SOLR_SSL_OPTS% -Djetty.home="%SOLR_SERVER_DIR%" -jar "%SOLR_SERVER_DIR%\start.jar" STOP.PORT=!STOP_PORT! STOP.KEY=%STOP_KEY% --stop
                 del "%SOLR_TIP%"\bin\solr-!SOME_SOLR_PORT!.port
                 timeout /T 5
@@ -1007,7 +1007,7 @@ IF "%SCRIPT_CMD%"=="stop" (
         IF "%%M"=="%SOLR_JETTY_HOST%:%SOLR_PORT%" (
           set found_it=1
           @echo Stopping Solr process %%N running on port %SOLR_PORT%
-          IF "%STOP_PORT%"=="" set /A STOP_PORT=%SOLR_PORT% - 1000
+          IF "%STOP_PORT%"=="" set /A STOP_PORT=%SOLR_PORT% - 1000
           "%JAVA%" %SOLR_SSL_OPTS% -Djetty.home="%SOLR_SERVER_DIR%" -jar "%SOLR_SERVER_DIR%\start.jar" "%SOLR_JETTY_CONFIG%" STOP.PORT=!STOP_PORT! STOP.KEY=%STOP_KEY% --stop
           del "%SOLR_TIP%"\bin\solr-%SOLR_PORT%.port
           timeout /T 5
@@ -1221,7 +1221,7 @@ IF "%SOLR_SSL_ENABLED%"=="true" (
 IF NOT "%SOLR_LOG_LEVEL%"=="" set "START_OPTS=%START_OPTS% -Dsolr.log.level=%SOLR_LOG_LEVEL%"
 set "START_OPTS=%START_OPTS% -Dsolr.log.dir=%SOLR_LOGS_DIR_QUOTED%"
 IF NOT "%SOLR_DATA_HOME%"=="" set "START_OPTS=%START_OPTS% -Dsolr.data.home=%SOLR_DATA_HOME_QUOTED%"
-IF NOT DEFINED LOG4J_CONFIG set "LOG4J_CONFIG=file:%SOLR_SERVER_DIR%\resources\log4j.properties"
+IF NOT DEFINED LOG4J_CONFIG set "LOG4J_CONFIG=file:%SOLR_SERVER_DIR%\resources\log4j2.xml"
 
 cd /d "%SOLR_SERVER_DIR%"
 
@@ -1253,14 +1253,14 @@ IF "%FG%"=="1" (
   title "Solr-%SOLR_PORT%"
   echo %SOLR_PORT%>"%SOLR_TIP%"\bin\solr-%SOLR_PORT%.port
   "%JAVA%" %SERVEROPT% %SOLR_JAVA_MEM% %START_OPTS% ^
-    -Dlog4j.configuration="%LOG4J_CONFIG%" -DSTOP.PORT=!STOP_PORT! -DSTOP.KEY=%STOP_KEY% ^
+    -Dlog4j.configurationFile="%LOG4J_CONFIG%" -DSTOP.PORT=!STOP_PORT! -DSTOP.KEY=%STOP_KEY% ^
     -Dsolr.solr.home="%SOLR_HOME%" -Dsolr.install.dir="%SOLR_TIP%" -Dsolr.default.confdir="%DEFAULT_CONFDIR%" ^
     -Djetty.host=%SOLR_JETTY_HOST% -Djetty.port=%SOLR_PORT% -Djetty.home="%SOLR_SERVER_DIR%" ^
     -Djava.io.tmpdir="%SOLR_SERVER_DIR%\tmp" -jar start.jar "%SOLR_JETTY_CONFIG%" "%SOLR_JETTY_ADDL_CONFIG%"
 ) ELSE (
   START /B "Solr-%SOLR_PORT%" /D "%SOLR_SERVER_DIR%" ^
     "%JAVA%" %SERVEROPT% %SOLR_JAVA_MEM% %START_OPTS% ^
-    -Dlog4j.configuration="%LOG4J_CONFIG%" -DSTOP.PORT=!STOP_PORT! -DSTOP.KEY=%STOP_KEY% ^
+    -Dlog4j.configurationFile="%LOG4J_CONFIG%" -DSTOP.PORT=!STOP_PORT! -DSTOP.KEY=%STOP_KEY% ^
     -Dsolr.log.muteconsole ^
     -Dsolr.solr.home="%SOLR_HOME%" -Dsolr.install.dir="%SOLR_TIP%" -Dsolr.default.confdir="%DEFAULT_CONFDIR%" ^
     -Djetty.host=%SOLR_JETTY_HOST% -Djetty.port=%SOLR_PORT% -Djetty.home="%SOLR_SERVER_DIR%" ^
@@ -1269,7 +1269,7 @@ IF "%FG%"=="1" (
 
   REM now wait to see Solr come online ...
   "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" -Dsolr.default.confdir="%DEFAULT_CONFDIR%"^
-    -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+    -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
     -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
     org.apache.solr.util.SolrCLI status -maxWaitSecs 30 -solr !SOLR_URL_SCHEME!://%SOLR_TOOL_HOST%:%SOLR_PORT%/solr
 )
@@ -1280,7 +1280,7 @@ goto done
 REM Run the requested example
 
 "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-  -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+  -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
   -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
   org.apache.solr.util.SolrCLI run_example -script "%SDIR%\solr.cmd" -e %EXAMPLE% -d "%SOLR_SERVER_DIR%" ^
   -urlScheme !SOLR_URL_SCHEME! !PASS_TO_RUN_EXAMPLE!
@@ -1302,7 +1302,7 @@ for /f "usebackq" %%i in (`dir /b "%SOLR_TIP%\bin" ^| findstr /i "^solr-.*\.port
           set has_info=1
           echo Found Solr process %%k running on port !SOME_SOLR_PORT!
           "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-            -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+            -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
             -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
             org.apache.solr.util.SolrCLI status -solr !SOLR_URL_SCHEME!://%SOLR_TOOL_HOST%:!SOME_SOLR_PORT!/solr
           @echo.
@@ -1349,14 +1349,14 @@ IF NOT DEFINED HEALTHCHECK_COLLECTION goto healthcheck_usage
 IF NOT DEFINED HEALTHCHECK_VERBOSE set "HEALTHCHECK_VERBOSE="
 IF NOT DEFINED HEALTHCHECK_ZK_HOST set "HEALTHCHECK_ZK_HOST=localhost:9983"
 "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-  -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+  -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
   -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
   org.apache.solr.util.SolrCLI healthcheck -collection !HEALTHCHECK_COLLECTION! -zkHost !HEALTHCHECK_ZK_HOST! %HEALTHCHECK_VERBOSE%
 goto done
 
 :run_assert
 "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-  -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+  -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
   -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
   org.apache.solr.util.SolrCLI %* 
 if errorlevel 1 (
@@ -1366,7 +1366,7 @@ goto done
 
 :run_config
 "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-  -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+  -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
   -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
   org.apache.solr.util.SolrCLI %* 
 if errorlevel 1 (
@@ -1376,7 +1376,7 @@ goto done
 
 :get_version
 "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-  -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+  -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
   -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
   org.apache.solr.util.SolrCLI version
 goto done
@@ -1386,7 +1386,7 @@ set "TOOL_CMD=%~1"
 set q="-q"
 IF "%verbose%"=="1"  set q=""
 "%JAVA%" %SOLR_SSL_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-  -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+  -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
   -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
   org.apache.solr.util.SolrCLI utils -s "%DEFAULT_SERVER_DIR%" -l "%SOLR_LOGS_DIR%" %q:"=% %TOOL_CMD%
 if errorlevel 1 (
@@ -1492,13 +1492,13 @@ if "!CREATE_CONFDIR!"=="_default" (
 
 if "%SCRIPT_CMD%"=="create_core" (
   "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-    -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+    -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
     -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
     org.apache.solr.util.SolrCLI create_core -name !CREATE_NAME! -solrUrl !SOLR_URL_SCHEME!://%SOLR_TOOL_HOST%:!CREATE_PORT!/solr ^
     -confdir !CREATE_CONFDIR! -configsetsDir "%SOLR_TIP%\server\solr\configsets" %CREATE_VERBOSE%
 ) else (
   "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" -Dsolr.default.confdir="%DEFAULT_CONFDIR%"^
-    -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+    -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
     -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
     org.apache.solr.util.SolrCLI create -name !CREATE_NAME! -shards !CREATE_NUM_SHARDS! -replicationFactor !CREATE_REPFACT! ^
     -confname !CREATE_CONFNAME! -confdir !CREATE_CONFDIR! -configsetsDir "%SOLR_TIP%\server\solr\configsets" ^
@@ -1573,7 +1573,7 @@ if "!DELETE_CONFIG!"=="" (
 )
 
 "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
--Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+-Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
 -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
 org.apache.solr.util.SolrCLI delete -name !DELETE_NAME! -deleteConfig !DELETE_CONFIG! ^
 -solrUrl !SOLR_URL_SCHEME!://%SOLR_TOOL_HOST%:!DELETE_PORT!/solr %DELETE_VERBOSE%
@@ -1709,7 +1709,7 @@ IF "!ZK_OP!"=="upconfig" (
     goto zk_short_usage
   )
   "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-  -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+  -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
   -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
   org.apache.solr.util.SolrCLI !ZK_OP! -confname !CONFIGSET_NAME! -confdir !CONFIGSET_DIR! -zkHost !ZK_HOST! %ZK_VERBOSE%^
   -configsetsDir "%SOLR_TIP%/server/solr/configsets"
@@ -1723,7 +1723,7 @@ IF "!ZK_OP!"=="upconfig" (
     goto zk_short_usage
   )
   "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-  -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+  -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
   -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
   org.apache.solr.util.SolrCLI !ZK_OP! -confname !CONFIGSET_NAME! -confdir !CONFIGSET_DIR! -zkHost !ZK_HOST! %ZK_VERBOSE%
 ) ELSE IF "!ZK_OP!"=="cp" (
@@ -1742,7 +1742,7 @@ IF "!ZK_OP!"=="upconfig" (
   )
   )
   "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-  -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+  -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
   -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
   org.apache.solr.util.SolrCLI !ZK_OP! -zkHost !ZK_HOST! -src !ZK_SRC! -dst !ZK_DST! -recurse !ZK_RECURSE! %ZK_VERBOSE%
 ) ELSE IF "!ZK_OP!"=="mv" (
@@ -1755,7 +1755,7 @@ IF "!ZK_OP!"=="upconfig" (
     goto zk_short_usage
   )
   "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-  -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+  -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
   -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
   org.apache.solr.util.SolrCLI !ZK_OP! -zkHost !ZK_HOST! -src !ZK_SRC! -dst !ZK_DST! %ZK_VERBOSE%
 ) ELSE IF "!ZK_OP!"=="rm" (
@@ -1764,7 +1764,7 @@ IF "!ZK_OP!"=="upconfig" (
     goto zk_short_usage
   )
   "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-  -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+  -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
   -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
   org.apache.solr.util.SolrCLI !ZK_OP! -zkHost !ZK_HOST! -path !ZK_SRC! -recurse !ZK_RECURSE! %ZK_VERBOSE%
 ) ELSE IF "!ZK_OP!"=="ls" (
@@ -1773,7 +1773,7 @@ IF "!ZK_OP!"=="upconfig" (
     goto zk_short_usage
   )
   "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-  -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+  -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
   -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
   org.apache.solr.util.SolrCLI !ZK_OP! -zkHost !ZK_HOST! -path !ZK_SRC! -recurse !ZK_RECURSE! %ZK_VERBOSE%
 ) ELSE IF "!ZK_OP!"=="mkroot" (
@@ -1782,7 +1782,7 @@ IF "!ZK_OP!"=="upconfig" (
     goto zk_short_usage
   )
   "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-  -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+  -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
   -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
   org.apache.solr.util.SolrCLI !ZK_OP! -zkHost !ZK_HOST! -path !ZK_SRC! %ZK_VERBOSE%
 ) ELSE (
@@ -1843,7 +1843,7 @@ if "!AUTH_PORT!"=="" (
   )
 )
 "%JAVA%" %SOLR_SSL_OPTS% %AUTHC_OPTS% %SOLR_ZK_CREDS_AND_ACLS% -Dsolr.install.dir="%SOLR_TIP%" ^
-    -Dlog4j.configuration="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j.properties" ^
+    -Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml" ^
     -classpath "%DEFAULT_SERVER_DIR%\solr-webapp\webapp\WEB-INF\lib\*;%DEFAULT_SERVER_DIR%\lib\ext\*" ^
     org.apache.solr.util.SolrCLI auth %AUTH_PARAMS% -solrIncludeFile "%SOLR_INCLUDE%" -authConfDir "%SOLR_HOME%" ^
     -solrUrl !SOLR_URL_SCHEME!://%SOLR_TOOL_HOST%:!AUTH_PORT!/solr

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/bin/solr.in.cmd
----------------------------------------------------------------------
diff --git a/solr/bin/solr.in.cmd b/solr/bin/solr.in.cmd
index bfb33e0..6f7867f 100644
--- a/solr/bin/solr.in.cmd
+++ b/solr/bin/solr.in.cmd
@@ -78,7 +78,7 @@ REM If not set, defaults to <instance_dir>/data. Overridable per core through 'd
 REM set SOLR_DATA_HOME=
 
 REM Changes the logging level. Valid values: ALL, TRACE, DEBUG, INFO, WARN, ERROR, FATAL, OFF. Default is INFO
-REM This is an alternative to changing the rootLogger in log4j.properties
+REM This is an alternative to changing the rootLogger in log4j2.xml
 REM set SOLR_LOG_LEVEL=INFO
 
 REM Location where Solr should write logs to. Absolute or relative to solr start dir

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/bin/solr.in.sh
----------------------------------------------------------------------
diff --git a/solr/bin/solr.in.sh b/solr/bin/solr.in.sh
index e7478cd..d023b38 100644
--- a/solr/bin/solr.in.sh
+++ b/solr/bin/solr.in.sh
@@ -93,13 +93,13 @@
 # If not set, defaults to <instance_dir>/data. Overridable per core through 'dataDir' core property
 #SOLR_DATA_HOME=
 
-# Solr provides a default Log4J configuration properties file in server/resources
+# Solr provides a default Log4J configuration xml file in server/resources
 # however, you may want to customize the log settings and file appender location
-# so you can point the script to use a different log4j.properties file
-#LOG4J_PROPS=/var/solr/log4j.properties
+# so you can point the script to use a different log4j2.xml file
+#LOG4J_PROPS=/var/solr/log4j2.xml
 
 # Changes the logging level. Valid values: ALL, TRACE, DEBUG, INFO, WARN, ERROR, FATAL, OFF. Default is INFO
-# This is an alternative to changing the rootLogger in log4j.properties
+# This is an alternative to changing the rootLogger in log4j2.xml
 #SOLR_LOG_LEVEL=INFO
 
 # Location where Solr should write logs to. Absolute or relative to solr start dir

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/contrib/clustering/src/test-files/log4j.properties
----------------------------------------------------------------------
diff --git a/solr/contrib/clustering/src/test-files/log4j.properties b/solr/contrib/clustering/src/test-files/log4j.properties
deleted file mode 100644
index b5216db..0000000
--- a/solr/contrib/clustering/src/test-files/log4j.properties
+++ /dev/null
@@ -1,10 +0,0 @@
-#  Logging level
-log4j.rootLogger=INFO, CONSOLE
-
-log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
-log4j.appender.CONSOLE.Target=System.err
-log4j.appender.CONSOLE.layout=org.apache.solr.util.SolrLogLayout
-log4j.appender.CONSOLE.layout.ConversionPattern=%-5p - %d{yyyy-MM-dd HH:mm:ss.SSS}; %C; %m%n
-
-log4j.logger.org.apache.zookeeper=WARN
-log4j.logger.org.apache.hadoop=WARN

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/contrib/clustering/src/test-files/log4j2.xml
----------------------------------------------------------------------
diff --git a/solr/contrib/clustering/src/test-files/log4j2.xml b/solr/contrib/clustering/src/test-files/log4j2.xml
new file mode 100644
index 0000000..9b2a029
--- /dev/null
+++ b/solr/contrib/clustering/src/test-files/log4j2.xml
@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<Configuration>
+  <Appenders>
+    <Console name="STDERR" target="SYSTEM_ERR">
+      <PatternLayout>
+        <Pattern>
+          %-5p - %d{yyyy-MM-dd HH:mm:ss.SSS}; %c; %m%n
+        </Pattern>
+      </PatternLayout>
+    </Console>
+  </Appenders>
+  <Loggers>
+    <Logger name="org.apache.zookeeper" level="WARN"/>
+    <Logger name="org.apache.hadoop" level="WARN"/>
+
+    <Root level="INFO">
+      <AppenderRef ref="STDERR"/>
+    </Root>
+  </Loggers>
+</Configuration>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/contrib/dataimporthandler/src/test-files/log4j.properties
----------------------------------------------------------------------
diff --git a/solr/contrib/dataimporthandler/src/test-files/log4j.properties b/solr/contrib/dataimporthandler/src/test-files/log4j.properties
deleted file mode 100644
index d3ea4de..0000000
--- a/solr/contrib/dataimporthandler/src/test-files/log4j.properties
+++ /dev/null
@@ -1,9 +0,0 @@
-#  Logging level
-log4j.rootLogger=INFO, CONSOLE
-
-log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
-log4j.appender.CONSOLE.Target=System.err
-log4j.appender.CONSOLE.layout=org.apache.solr.util.SolrLogLayout
-log4j.appender.CONSOLE.layout.ConversionPattern=%-5p - %d{yyyy-MM-dd HH:mm:ss.SSS}; %C; %m%n
-
-log4j.logger.org.apache.zookeeper=WARN

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/contrib/dataimporthandler/src/test-files/log4j2.xml
----------------------------------------------------------------------
diff --git a/solr/contrib/dataimporthandler/src/test-files/log4j2.xml b/solr/contrib/dataimporthandler/src/test-files/log4j2.xml
new file mode 100644
index 0000000..fd74d4e
--- /dev/null
+++ b/solr/contrib/dataimporthandler/src/test-files/log4j2.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<Configuration>
+  <Appenders>
+    <Console name="STDERR" target="SYSTEM_ERR">
+      <PatternLayout>
+        <Pattern>
+          %-5p - %d{yyyy-MM-dd HH:mm:ss.SSS}; %c; %m%n
+        </Pattern>
+      </PatternLayout>
+    </Console>
+  </Appenders>
+  <Loggers>
+    <Logger name="org.apache.zookeeper" level="WARN"/>
+
+    <Root level="INFO">
+      <AppenderRef ref="STDERR"/>
+    </Root>
+  </Loggers>
+</Configuration>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/contrib/ltr/src/test-files/log4j.properties
----------------------------------------------------------------------
diff --git a/solr/contrib/ltr/src/test-files/log4j.properties b/solr/contrib/ltr/src/test-files/log4j.properties
deleted file mode 100644
index d86c698..0000000
--- a/solr/contrib/ltr/src/test-files/log4j.properties
+++ /dev/null
@@ -1,32 +0,0 @@
-#  Logging level
-log4j.rootLogger=INFO, CONSOLE
-
-log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
-log4j.appender.CONSOLE.Target=System.err
-log4j.appender.CONSOLE.layout=org.apache.log4j.EnhancedPatternLayout
-log4j.appender.CONSOLE.layout.ConversionPattern=%-4r %-5p (%t) [%X{node_name} %X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
-log4j.logger.org.apache.zookeeper=WARN
-log4j.logger.org.apache.hadoop=WARN
-log4j.logger.org.apache.directory=WARN
-log4j.logger.org.apache.solr.hadoop=INFO
-log4j.logger.org.apache.solr.client.solrj.embedded.JettySolrRunner=DEBUG
-org.apache.solr.client.solrj.embedded.JettySolrRunner=DEBUG
-
-#log4j.logger.org.apache.solr.update.processor.LogUpdateProcessor=DEBUG
-#log4j.logger.org.apache.solr.update.processor.DistributedUpdateProcessor=DEBUG
-#log4j.logger.org.apache.solr.update.PeerSync=DEBUG
-#log4j.logger.org.apache.solr.core.CoreContainer=DEBUG
-#log4j.logger.org.apache.solr.cloud.RecoveryStrategy=DEBUG
-#log4j.logger.org.apache.solr.cloud.SyncStrategy=DEBUG
-#log4j.logger.org.apache.solr.handler.admin.CoreAdminHandler=DEBUG
-#log4j.logger.org.apache.solr.cloud.ZkController=DEBUG
-#log4j.logger.org.apache.solr.update.DefaultSolrCoreState=DEBUG
-#log4j.logger.org.apache.solr.common.cloud.ConnectionManager=DEBUG
-#log4j.logger.org.apache.solr.update.UpdateLog=DEBUG
-#log4j.logger.org.apache.solr.cloud.ChaosMonkey=DEBUG
-#log4j.logger.org.apache.solr.update.TransactionLog=DEBUG
-#log4j.logger.org.apache.solr.handler.ReplicationHandler=DEBUG
-#log4j.logger.org.apache.solr.handler.IndexFetcher=DEBUG
-
-#log4j.logger.org.apache.solr.common.cloud.ClusterStateUtil=DEBUG
-#log4j.logger.org.apache.solr.cloud.OverseerAutoReplicaFailoverThread=DEBUG

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/contrib/ltr/src/test-files/log4j2.xml
----------------------------------------------------------------------
diff --git a/solr/contrib/ltr/src/test-files/log4j2.xml b/solr/contrib/ltr/src/test-files/log4j2.xml
new file mode 100644
index 0000000..5acf4d0
--- /dev/null
+++ b/solr/contrib/ltr/src/test-files/log4j2.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<Configuration>
+  <Appenders>
+    <Console name="STDERR" target="SYSTEM_ERR">
+      <PatternLayout>
+        <Pattern>
+          %-4r %-5p (%t) [%X{node_name} %X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
+        </Pattern>
+      </PatternLayout>
+    </Console>
+  </Appenders>
+  <Loggers>
+    <Logger name="org.apache.zookeeper" level="WARN"/>
+    <Logger name="org.apache.hadoop" level="WARN"/>
+    <Logger name="org.apache.directory" level="WARN"/>
+    <Logger name="org.apache.solr.hadoop" level="INFO"/>
+    <Logger name="log4j.logger.org.apache.solr.hadoop" level="INFO"/>
+    <Logger name="org.apache.solr.client.solrj.embedded.JettySolrRunner" level="DEBUG"/>
+
+    <Root level="INFO">
+      <AppenderRef ref="STDERR"/>
+    </Root>
+  </Loggers>
+</Configuration>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/contrib/prometheus-exporter/ivy.xml
----------------------------------------------------------------------
diff --git a/solr/contrib/prometheus-exporter/ivy.xml b/solr/contrib/prometheus-exporter/ivy.xml
index a8f8894..2c67825 100644
--- a/solr/contrib/prometheus-exporter/ivy.xml
+++ b/solr/contrib/prometheus-exporter/ivy.xml
@@ -32,8 +32,9 @@
     <dependency org="net.thisptr" name="jackson-jq" rev="${/net.thisptr/jackson-jq}" conf="compile"/>
     <dependency org="net.sourceforge.argparse4j" name="argparse4j" rev="${/net.sourceforge.argparse4j/argparse4j}" conf="compile"/>
     <dependency org="org.slf4j" name="slf4j-api" rev="${/org.slf4j/slf4j-api}" conf="compile"/>
-    <dependency org="org.slf4j" name="slf4j-log4j12" rev="${/org.slf4j/slf4j-log4j12}" conf="compile"/>
-    <dependency org="log4j" name="log4j" rev="${/log4j/log4j}" conf="compile"/>
+    <dependency org="org.apache.logging.log4j" name="log4j-slf4j-impl" rev="${/org.apache.logging.log4j/log4j-slf4j-impl}" conf="test"/>
+    <dependency org="org.apache.logging.log4j" name="log4j-api" rev="${/org.apache.logging.log4j/log4j-api}" conf="compile"/>
+    <dependency org="org.apache.logging.log4j" name="log4j-core" rev="${/org.apache.logging.log4j/log4j-core}" conf="compile"/>
 
     <exclude org="*" ext="*" matcher="regexp" type="${ivy.exclude.types}"/>
   </dependencies>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/ivy.xml
----------------------------------------------------------------------
diff --git a/solr/core/ivy.xml b/solr/core/ivy.xml
index ff4fa48..e47d5b8 100644
--- a/solr/core/ivy.xml
+++ b/solr/core/ivy.xml
@@ -47,8 +47,12 @@
     <dependency org="joda-time" name="joda-time" rev="${/joda-time/joda-time}" conf="compile"/>
     <dependency org="dom4j" name="dom4j" rev="${/dom4j/dom4j}" conf="compile"/>
     <dependency org="com.carrotsearch" name="hppc" rev="${/com.carrotsearch/hppc}" conf="compile"/>
-    <dependency org="log4j" name="log4j" rev="${/log4j/log4j}" conf="compile"/>
-    <dependency org="org.slf4j" name="slf4j-log4j12" rev="${/org.slf4j/slf4j-log4j12}" conf="compile"/>
+
+    <dependency org="org.apache.logging.log4j" name="log4j-api" rev="${/org.apache.logging.log4j/log4j-api}" conf="compile"/>
+    <dependency org="org.apache.logging.log4j" name="log4j-core" rev="${/org.apache.logging.log4j/log4j-core}" conf="compile"/>
+    <dependency org="org.apache.logging.log4j" name="log4j-slf4j-impl" rev="${/org.apache.logging.log4j/log4j-slf4j-impl}" conf="compile"/>
+    <dependency org="org.apache.logging.log4j" name="log4j-1.2-api" rev="${/org.apache.logging.log4j/log4j-1.2-api}" conf="compile"/>
+    <dependency org="com.lmax" name="disruptor" rev="${/com.lmax/disruptor}" conf="compile"/>
     <dependency org="org.slf4j" name="jcl-over-slf4j" rev="${/org.slf4j/jcl-over-slf4j}" conf="compile"/>
 
     <dependency org="org.mockito" name="mockito-core" rev="${/org.mockito/mockito-core}" conf="test"/>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/java/org/apache/solr/client/solrj/embedded/JettySolrRunner.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/client/solrj/embedded/JettySolrRunner.java b/solr/core/src/java/org/apache/solr/client/solrj/embedded/JettySolrRunner.java
index 23a8dc1..745341a 100644
--- a/solr/core/src/java/org/apache/solr/client/solrj/embedded/JettySolrRunner.java
+++ b/solr/core/src/java/org/apache/solr/client/solrj/embedded/JettySolrRunner.java
@@ -363,7 +363,7 @@ public class JettySolrRunner {
    *
    * If the server has been started before, it will restart using the same port
    *
-   * @throws Exception if an error occurs on startup
+   * @throws java.lang.Exception if an error occurs on startup
    */
   public void start() throws Exception {
     start(true);

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/java/org/apache/solr/handler/admin/LoggingHandler.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/handler/admin/LoggingHandler.java b/solr/core/src/java/org/apache/solr/handler/admin/LoggingHandler.java
index 122d2cb..ef52636 100644
--- a/solr/core/src/java/org/apache/solr/handler/admin/LoggingHandler.java
+++ b/solr/core/src/java/org/apache/solr/handler/admin/LoggingHandler.java
@@ -67,7 +67,7 @@ public class LoggingHandler extends RequestHandlerBase implements SolrCoreAware
   @Override
   public void handleRequestBody(SolrQueryRequest req, SolrQueryResponse rsp) throws Exception {
     // Don't do anything if the framework is unknown
-    if(watcher==null) {
+    if (watcher==null) {
       rsp.add("error", "Logging Not Initialized");
       return;
     }
@@ -142,7 +142,7 @@ public class LoggingHandler extends RequestHandlerBase implements SolrCoreAware
       Collections.sort(loggers);
   
       List<SimpleOrderedMap<?>> info = new ArrayList<>();
-      for(LoggerInfo wrap:loggers) {
+      for (LoggerInfo wrap : loggers) {
         info.add(wrap.getInfo());
       }
       rsp.add("loggers", info);

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/java/org/apache/solr/logging/LogWatcher.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/logging/LogWatcher.java b/solr/core/src/java/org/apache/solr/logging/LogWatcher.java
index c510590..86ea8cf 100644
--- a/solr/core/src/java/org/apache/solr/logging/LogWatcher.java
+++ b/solr/core/src/java/org/apache/solr/logging/LogWatcher.java
@@ -20,7 +20,7 @@ import org.apache.solr.common.SolrDocument;
 import org.apache.solr.common.SolrDocumentList;
 import org.apache.solr.core.SolrResourceLoader;
 import org.apache.solr.logging.jul.JulWatcher;
-import org.apache.solr.logging.log4j.Log4jWatcher;
+import org.apache.solr.logging.log4j2.Log4j2Watcher;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.slf4j.impl.StaticLoggerBinder;
@@ -34,7 +34,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
 /**
  * A Class to monitor Logging events and hold N events in memory
  * 
- * This is abstract so we can support both JUL and Log4j (and other logging platforms)
+ * This is abstract so we can support both JUL and Log4j2 (and other logging platforms)
  */
 public abstract class LogWatcher<E> {
 
@@ -152,8 +152,8 @@ public abstract class LogWatcher<E> {
       slf4jImpl = StaticLoggerBinder.getSingleton().getLoggerFactoryClassStr();
       log.debug("SLF4J impl is " + slf4jImpl);
       if (fname == null) {
-        if ("org.slf4j.impl.Log4jLoggerFactory".equals(slf4jImpl)) {
-          fname = "Log4j";
+        if ("org.apache.logging.slf4j.Log4jLoggerFactory".equals(slf4jImpl)) {
+          fname = "Log4j2";
         } else if (slf4jImpl.indexOf("JDK") > 0) {
           fname = "JUL";
         }
@@ -172,10 +172,12 @@ public abstract class LogWatcher<E> {
       return null;
     }
 
-    if ("JUL".equalsIgnoreCase(fname))
+    if ("JUL".equalsIgnoreCase(fname)) {
       return new JulWatcher(slf4jImpl);
-    if ("Log4j".equals(fname))
-      return new Log4jWatcher(slf4jImpl);
+    }
+    if ("Log4j2".equals(fname)) {
+      return new Log4j2Watcher();
+    }
 
     try {
       return loader != null ? loader.newInstance(fname, LogWatcher.class) : null;

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/java/org/apache/solr/logging/log4j/EventAppender.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/logging/log4j/EventAppender.java b/solr/core/src/java/org/apache/solr/logging/log4j/EventAppender.java
deleted file mode 100644
index ff2876f..0000000
--- a/solr/core/src/java/org/apache/solr/logging/log4j/EventAppender.java
+++ /dev/null
@@ -1,48 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.solr.logging.log4j;
-
-import org.apache.log4j.AppenderSkeleton;
-import org.apache.log4j.spi.LoggingEvent;
-import org.apache.solr.common.util.SuppressForbidden;
-import org.apache.solr.logging.LogWatcher;
-
-@SuppressForbidden(reason = "class is specific to log4j")
-public final class EventAppender extends AppenderSkeleton {
-
-  final LogWatcher<LoggingEvent> watcher;
-
-  public EventAppender(LogWatcher<LoggingEvent> framework) {
-    this.watcher = framework;
-  }
-
-  @Override
-  public void append( LoggingEvent event )
-  {
-    watcher.add(event,event.timeStamp);
-  }
-
-  @Override
-  public void close() {
-    watcher.reset();
-  }
-
-  @Override
-  public boolean requiresLayout() {
-    return false;
-  }
-}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/java/org/apache/solr/logging/log4j/Log4jInfo.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/logging/log4j/Log4jInfo.java b/solr/core/src/java/org/apache/solr/logging/log4j/Log4jInfo.java
deleted file mode 100644
index dfd3dde..0000000
--- a/solr/core/src/java/org/apache/solr/logging/log4j/Log4jInfo.java
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.solr.logging.log4j;
-
-import org.apache.solr.common.util.SuppressForbidden;
-import org.apache.solr.logging.LoggerInfo;
-
-@SuppressForbidden(reason = "class is specific to log4j")
-public class Log4jInfo extends LoggerInfo {
-  final org.apache.log4j.Logger logger;
-
-  public Log4jInfo(String name, org.apache.log4j.Logger logger) {
-    super(name);
-    this.logger = logger;
-  }
-
-  @Override
-  public String getLevel() {
-    if(logger==null) {
-      return null;
-    }
-    Object level = logger.getLevel();
-    if(level==null) {
-      return null;
-    }
-    return level.toString();
-  }
-
-  @Override
-  public String getName() {
-    return name;
-  }
-
-  @Override
-  public boolean isSet() {
-    return (logger!=null && logger.getLevel()!=null);
-  }
-}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/java/org/apache/solr/logging/log4j/Log4jWatcher.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/logging/log4j/Log4jWatcher.java b/solr/core/src/java/org/apache/solr/logging/log4j/Log4jWatcher.java
deleted file mode 100644
index 04fa5fb..0000000
--- a/solr/core/src/java/org/apache/solr/logging/log4j/Log4jWatcher.java
+++ /dev/null
@@ -1,171 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.solr.logging.log4j;
-
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.Date;
-import java.util.Enumeration;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
-import org.apache.log4j.AppenderSkeleton;
-import org.apache.log4j.Level;
-import org.apache.log4j.Logger;
-import org.apache.log4j.spi.LoggingEvent;
-import org.apache.log4j.spi.ThrowableInformation;
-import org.apache.solr.common.SolrDocument;
-import org.apache.solr.common.cloud.ZkStateReader;
-import org.apache.solr.common.util.SuppressForbidden;
-import org.apache.solr.logging.CircularList;
-import org.apache.solr.logging.ListenerConfig;
-import org.apache.solr.logging.LogWatcher;
-import org.apache.solr.logging.LoggerInfo;
-
-import com.google.common.base.Throwables;
-
-@SuppressForbidden(reason = "class is specific to log4j")
-public class Log4jWatcher extends LogWatcher<LoggingEvent> {
-
-  final String name;
-  AppenderSkeleton appender = null;
-
-  public Log4jWatcher(String name) {
-    this.name = name;
-  }
-
-  @Override
-  public String getName() {
-    return "Log4j ("+name+")";
-  }
-
-  @Override
-  public List<String> getAllLevels() {
-    return Arrays.asList(
-        org.apache.log4j.Level.ALL.toString(),
-        org.apache.log4j.Level.TRACE.toString(),
-        org.apache.log4j.Level.DEBUG.toString(),
-        org.apache.log4j.Level.INFO.toString(),
-        org.apache.log4j.Level.WARN.toString(),
-        org.apache.log4j.Level.ERROR.toString(),
-        org.apache.log4j.Level.FATAL.toString(),
-        org.apache.log4j.Level.OFF.toString());
-  }
-
-  @Override
-  public void setLogLevel(String category, String level) {
-    org.apache.log4j.Logger log;
-    if(LoggerInfo.ROOT_NAME.equals(category)) {
-      log = org.apache.log4j.LogManager.getRootLogger();
-    } else {
-      log = org.apache.log4j.Logger.getLogger(category);
-    }
-    if(level==null||"unset".equals(level)||"null".equals(level)) {
-      log.setLevel(null);
-    }
-    else {
-      log.setLevel(org.apache.log4j.Level.toLevel(level));
-    }
-  }
-
-  @Override
-  public Collection<LoggerInfo> getAllLoggers() {
-    org.apache.log4j.Logger root = org.apache.log4j.LogManager.getRootLogger();
-    Map<String,LoggerInfo> map = new HashMap<>();
-    Enumeration<?> loggers = org.apache.log4j.LogManager.getCurrentLoggers();
-    while (loggers.hasMoreElements()) {
-      org.apache.log4j.Logger logger = (org.apache.log4j.Logger)loggers.nextElement();
-      String name = logger.getName();
-      if( logger == root) {
-        continue;
-      }
-      map.put(name, new Log4jInfo(name, logger));
-
-      while (true) {
-        int dot = name.lastIndexOf(".");
-        if (dot < 0)
-          break;
-        name = name.substring(0, dot);
-        if(!map.containsKey(name)) {
-          map.put(name, new Log4jInfo(name, null));
-        }
-      }
-    }
-    map.put(LoggerInfo.ROOT_NAME, new Log4jInfo(LoggerInfo.ROOT_NAME, root));
-    return map.values();
-  }
-
-  @Override
-  public void setThreshold(String level) {
-    if(appender==null) {
-      throw new IllegalStateException("Must have an appender");
-    }
-    appender.setThreshold(Level.toLevel(level));
-  }
-
-  @Override
-  public String getThreshold() {
-    if(appender==null) {
-      throw new IllegalStateException("Must have an appender");
-    }
-    return appender.getThreshold().toString();
-  }
-
-  @Override
-  public void registerListener(ListenerConfig cfg) {
-    if(history!=null) {
-      throw new IllegalStateException("History already registered");
-    }
-    history = new CircularList<>(cfg.size);
-
-    appender = new EventAppender(this);
-    if(cfg.threshold != null) {
-      appender.setThreshold(Level.toLevel(cfg.threshold));
-    }
-    else {
-      appender.setThreshold(Level.WARN);
-    }
-    Logger log = org.apache.log4j.LogManager.getRootLogger();
-    log.addAppender(appender);
-  }
-
-  @Override
-  public long getTimestamp(LoggingEvent event) {
-    return event.timeStamp;
-  }
-
-  @Override
-  public SolrDocument toSolrDocument(LoggingEvent event) {
-    SolrDocument doc = new SolrDocument();
-    doc.setField("time", new Date(event.getTimeStamp()));
-    doc.setField("level", event.getLevel().toString());
-    doc.setField("logger", event.getLogger().getName());
-    doc.setField("message", event.getRenderedMessage());
-    ThrowableInformation t = event.getThrowableInformation();
-    if(t!=null) {
-      doc.setField("trace", Throwables.getStackTraceAsString(t.getThrowable()));
-    }
-    
-    // Will be null if not present
-    doc.setField("core", event.getMDC(ZkStateReader.CORE_NAME_PROP));
-    doc.setField("collection", event.getMDC(ZkStateReader.COLLECTION_PROP));
-    doc.setField("replica", event.getMDC(ZkStateReader.REPLICA_PROP));
-    doc.setField("shard", event.getMDC(ZkStateReader.SHARD_ID_PROP));
-    return doc;
-  }
-}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/java/org/apache/solr/logging/log4j/package-info.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/logging/log4j/package-info.java b/solr/core/src/java/org/apache/solr/logging/log4j/package-info.java
deleted file mode 100644
index f789533..0000000
--- a/solr/core/src/java/org/apache/solr/logging/log4j/package-info.java
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- 
-/** 
- * Log4j based implementation of {@link org.apache.solr.logging.LogWatcher}
- */
-package org.apache.solr.logging.log4j;
-
-

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/java/org/apache/solr/logging/log4j2/Log4j2Watcher.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/logging/log4j2/Log4j2Watcher.java b/solr/core/src/java/org/apache/solr/logging/log4j2/Log4j2Watcher.java
new file mode 100644
index 0000000..894ba54
--- /dev/null
+++ b/solr/core/src/java/org/apache/solr/logging/log4j2/Log4j2Watcher.java
@@ -0,0 +1,289 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.logging.log4j2;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.core.Filter;
+import org.apache.logging.log4j.core.LoggerContext;
+import org.apache.logging.log4j.core.appender.AbstractAppender;
+import org.apache.logging.log4j.core.config.Configuration;
+import org.apache.logging.log4j.core.config.LoggerConfig;
+import org.apache.logging.log4j.core.LogEvent;
+import org.apache.logging.log4j.core.filter.ThresholdFilter;
+import org.apache.logging.log4j.message.Message;
+import org.apache.solr.common.SolrDocument;
+import org.apache.solr.logging.CircularList;
+import org.apache.solr.logging.ListenerConfig;
+import org.apache.solr.logging.LogWatcher;
+import org.apache.solr.logging.LoggerInfo;
+
+import com.google.common.base.Throwables;
+
+public class Log4j2Watcher extends LogWatcher<LogEvent> {
+
+  private final static String LOG4J2_WATCHER_APPENDER = "Log4j2WatcherAppender";
+  protected class Log4j2Appender extends AbstractAppender {
+
+    private Log4j2Watcher watcher;
+    private ThresholdFilter filter;
+    private Level threshold;
+
+    Log4j2Appender(Log4j2Watcher watcher, ThresholdFilter filter, Level threshold) {
+      super(LOG4J2_WATCHER_APPENDER, filter, null);
+      this.watcher = watcher;
+      this.filter = filter;
+      this.threshold = threshold;
+    }
+
+    public void append(LogEvent logEvent) {
+      watcher.add(logEvent, logEvent.getTimeMillis());
+    }
+
+    public Level getThreshold() {
+      return threshold;
+    }
+
+    public void setThreshold(Level threshold) {
+      this.threshold = threshold;
+      removeFilter(filter);
+      filter = ThresholdFilter.createFilter(threshold, Filter.Result.ACCEPT, Filter.Result.DENY);
+      addFilter(filter);
+    }
+  }
+
+  protected class Log4j2Info extends LoggerInfo {
+    final Level level;
+
+    Log4j2Info(String name, Level level) {
+      super(name);
+      this.level = level;
+    }
+
+    @Override
+    public String getLevel() {
+      return (level != null) ? level.toString() : null;
+    }
+
+    @Override
+    public String getName() {
+      return name;
+    }
+
+    @Override
+    public boolean isSet() {
+      return (level != null) ? true : false;
+    }
+  }
+
+  public static final Logger log = LogManager.getLogger(Log4j2Watcher.class);
+
+  protected Log4j2Appender appender = null;
+
+  @Override
+  public String getName() {
+    return "Log4j2";
+  }
+
+  @Override
+  public List<String> getAllLevels() {
+    return Arrays.asList(
+      Level.ALL.toString(),
+      Level.TRACE.toString(),
+      Level.DEBUG.toString(),
+      Level.INFO.toString(),
+      Level.WARN.toString(),
+      Level.ERROR.toString(),
+      Level.FATAL.toString(),
+      Level.OFF.toString());
+  }
+
+  @Override
+  public void setLogLevel(String loggerName, String level) {
+    assert loggerName != null;
+    assert level != null;
+    LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
+    Configuration config = ctx.getConfiguration();
+    LoggerConfig loggerConfig = getLoggerConfig(ctx, loggerName);
+    assert loggerConfig != null;
+    boolean madeChanges = false;
+    if (loggerName.equals(loggerConfig.getName()) || isRootLogger(loggerName)) {
+      if (level == null || "unset".equals(level) || "null".equals(level)) {
+        level = Level.OFF.toString();
+        loggerConfig.setLevel(Level.OFF);
+        madeChanges = true;
+      } else {
+        try {
+          loggerConfig.setLevel(Level.valueOf(level));
+          madeChanges = true;
+        } catch (IllegalArgumentException iae) {
+          log.error("{} is not a valid log level! Valid values are: {}", level, getAllLevels());
+        }
+      }
+    } else {
+      //It doesn't have it's own logger yet so let's create one
+      LoggerConfig explicitConfig = new LoggerConfig(loggerName, Level.valueOf(level), true);
+      explicitConfig.setParent(loggerConfig);
+      config.addLogger(loggerName, explicitConfig);
+      madeChanges = true;
+    }
+
+    if (madeChanges) {
+      ctx.updateLoggers();
+      if (log.isInfoEnabled()) {
+        log.info("Setting log level to '{}' for logger: {}", level, loggerName);
+      }
+    }
+
+  }
+
+  protected boolean isRootLogger(String loggerName) {
+    return LoggerInfo.ROOT_NAME.equals(loggerName);
+  }
+
+  protected LoggerConfig getLoggerConfig(LoggerContext ctx, String loggerName) {
+    Configuration config = ctx.getConfiguration();
+    return isRootLogger(loggerName) ? config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME)
+                                  : config.getLoggerConfig(loggerName);
+  }
+
+  @Override
+  public Collection<LoggerInfo> getAllLoggers() {
+    Logger root = LogManager.getRootLogger();
+    LoggerContext ctx = (LoggerContext)LogManager.getContext(false);
+    Map<String,LoggerInfo> map = new HashMap<>(ctx.getLoggers().size());
+
+    //First let's get the explicitly configured loggers
+    Map<String, LoggerConfig> loggers = ctx.getConfiguration().getLoggers();
+    for(Map.Entry<String, LoggerConfig> logger : loggers.entrySet()) {
+      String name = logger.getKey();
+
+      if (logger == root || root.equals(logger) || isRootLogger(name) || "".equals(name)) {
+        continue;
+      }
+      map.put(name, new Log4j2Info(name, logger.getValue().getLevel()));
+    }
+
+    for (org.apache.logging.log4j.core.Logger logger : ctx.getLoggers()) {
+      String name = logger.getName();
+      if (logger == root || root.equals(logger) || isRootLogger(name))
+        continue;
+
+      map.put(name, new Log4j2Info(name, logger.getLevel()));
+      while (true) {
+        int dot = name.lastIndexOf(".");
+        if (dot < 0)
+          break;
+
+          name = name.substring(0, dot);
+          if (!map.containsKey(name))
+            map.put(name, new Log4j2Info(name, null));
+      }
+    }
+    map.put(LoggerInfo.ROOT_NAME, new Log4j2Info(LoggerInfo.ROOT_NAME, root.getLevel()));
+    return map.values();
+  }
+
+  @Override
+  public void setThreshold(String level) {
+    Log4j2Appender app = getAppender();
+    Level current = app.getThreshold();
+    app.setThreshold(Level.toLevel(level));
+    LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
+    LoggerConfig config = getLoggerConfig(ctx, LoggerInfo.ROOT_NAME);
+    config.removeAppender(app.getName());
+    config.addAppender(app, app.getThreshold(), app.getFilter());
+    ((LoggerContext)LogManager.getContext(false)).updateLoggers();
+    if (log.isInfoEnabled()) {
+      log.info("Updated watcher threshold from {} to {} ", current, level);
+    }
+  }
+
+  @Override
+  public String getThreshold() {
+    return String.valueOf(getAppender().getThreshold());
+  }
+
+  protected Log4j2Appender getAppender() {
+    if (appender == null)
+      throw new IllegalStateException("No appenders configured! Must call registerListener(ListenerConfig) first.");
+    return appender;
+  }
+
+  @Override
+  public void registerListener(ListenerConfig cfg) {
+    if (history != null)
+      throw new IllegalStateException("History already registered");
+
+    history = new CircularList<LogEvent>(cfg.size);
+
+    Level threshold = (cfg.threshold != null) ? Level.toLevel(cfg.threshold) : Level.WARN;
+    ThresholdFilter filter = ThresholdFilter.createFilter(threshold, Filter.Result.ACCEPT, Filter.Result.DENY);
+
+    // If there's already an appender like this, remove it
+    LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
+    LoggerConfig config = getLoggerConfig(ctx, LoggerInfo.ROOT_NAME);
+
+    appender = new Log4j2Appender(this, filter, threshold); // "Log4j2WatcherAppender"
+
+    config.removeAppender(appender.getName());
+
+    if (!appender.isStarted())
+      appender.start();
+
+    config.addAppender(appender, threshold, filter);
+    ctx.updateLoggers();
+  }
+
+  @Override
+  public long getTimestamp(LogEvent event) {
+    return event.getTimeMillis();
+  }
+
+  @Override
+  public SolrDocument toSolrDocument(LogEvent event) {
+    SolrDocument doc = new SolrDocument();
+    doc.setField("time", new Date(event.getTimeMillis()));
+    doc.setField("level", event.getLevel().toString());
+    doc.setField("logger", event.getLoggerName());
+    Message message = event.getMessage();
+    doc.setField("message", message.getFormattedMessage());
+    Throwable t = message.getThrowable();
+    if (t != null)
+      doc.setField("trace", Throwables.getStackTraceAsString(t));
+
+    Map<String,String> contextMap = event.getContextMap();
+    if (contextMap != null) {
+      for (String key : contextMap.keySet())
+        doc.setField(key, contextMap.get(key));
+    }
+
+    if (!doc.containsKey("core"))
+      doc.setField("core", ""); // avoids an ugly "undefined" column in the UI
+
+    return doc;
+  }
+}
+

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/java/org/apache/solr/logging/log4j2/package-info.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/logging/log4j2/package-info.java b/solr/core/src/java/org/apache/solr/logging/log4j2/package-info.java
new file mode 100644
index 0000000..8407984
--- /dev/null
+++ b/solr/core/src/java/org/apache/solr/logging/log4j2/package-info.java
@@ -0,0 +1,22 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * LOG4J2 based implementation of {@link org.apache.solr.logging.LogWatcher}
+ */
+package org.apache.solr.logging.log4j2;
+

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/java/org/apache/solr/servlet/SolrDispatchFilter.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/servlet/SolrDispatchFilter.java b/solr/core/src/java/org/apache/solr/servlet/SolrDispatchFilter.java
index edf616e..a70e2b8 100644
--- a/solr/core/src/java/org/apache/solr/servlet/SolrDispatchFilter.java
+++ b/solr/core/src/java/org/apache/solr/servlet/SolrDispatchFilter.java
@@ -153,6 +153,7 @@ public class SolrDispatchFilter extends BaseSolrFilter {
     SolrRequestParsers.fileCleaningTracker = new SolrFileCleaningTracker();
 
     StartupLoggingUtils.checkLogDir();
+    log.info("Using logger factory {}", StartupLoggingUtils.getLoggerImplStr());
     logWelcomeBanner();
     String muteConsole = System.getProperty(SOLR_LOG_MUTECONSOLE);
     if (muteConsole != null && !Arrays.asList("false","0","off","no").contains(muteConsole.toLowerCase(Locale.ROOT))) {

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/java/org/apache/solr/util/SolrCLI.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/util/SolrCLI.java b/solr/core/src/java/org/apache/solr/util/SolrCLI.java
index a768a32..784ccbe 100644
--- a/solr/core/src/java/org/apache/solr/util/SolrCLI.java
+++ b/solr/core/src/java/org/apache/solr/util/SolrCLI.java
@@ -4317,7 +4317,7 @@ public class SolrCLI {
      *   ...
      *   solr.log   -&gt; solr.log.1
      * </pre>
-     * @param generations number of generations to keep. Should agree with setting in log4j.properties
+     * @param generations number of generations to keep. Should agree with setting in log4j2.xml
      * @return 0 if success
      * @throws Exception if problems
      */

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/java/org/apache/solr/util/SolrLogLayout.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/util/SolrLogLayout.java b/solr/core/src/java/org/apache/solr/util/SolrLogLayout.java
index 735cde2..7a11e15 100644
--- a/solr/core/src/java/org/apache/solr/util/SolrLogLayout.java
+++ b/solr/core/src/java/org/apache/solr/util/SolrLogLayout.java
@@ -16,15 +16,18 @@
  */
 package org.apache.solr.util;
 
+import java.nio.charset.Charset;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.WeakHashMap;
 
-import org.apache.log4j.Layout;
-import org.apache.log4j.Level;
-import org.apache.log4j.spi.LoggingEvent;
-import org.apache.log4j.spi.ThrowableInformation;
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.core.LogEvent;
+import org.apache.logging.log4j.core.config.plugins.Plugin;
+import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
+import org.apache.logging.log4j.core.config.plugins.PluginFactory;
+import org.apache.logging.log4j.core.layout.AbstractStringLayout;
 import org.apache.solr.cloud.ZkController;
 import org.apache.solr.common.SolrException;
 import org.apache.solr.common.StringUtils;
@@ -43,7 +46,18 @@ import static org.apache.solr.common.cloud.ZkStateReader.REPLICA_PROP;
 import static org.apache.solr.common.cloud.ZkStateReader.SHARD_ID_PROP;
 
 @SuppressForbidden(reason = "class is specific to log4j")
-public class SolrLogLayout extends Layout {
+@Plugin(name = "SolrLogLayout", category = "Core", elementType = "layout", printObject = true)
+public class SolrLogLayout extends AbstractStringLayout {
+  
+  protected SolrLogLayout(Charset charset) {
+    super(charset);
+  }
+
+  @PluginFactory
+  public static SolrLogLayout createLayout(@PluginAttribute(value = "charset", defaultString = "UTF-8") Charset charset) {
+    return new SolrLogLayout(charset);
+  }
+
   /**
    * Add this interface to a thread group and the string returned by getTag()
    * will appear in log statements of any threads under that group.
@@ -98,7 +112,7 @@ public class SolrLogLayout extends Layout {
   
   public Map<String,String> classAliases = new HashMap<>();
   
-  public void appendThread(StringBuilder sb, LoggingEvent event) {
+  public void appendThread(StringBuilder sb, LogEvent event) {
     Thread th = Thread.currentThread();
     
     /******
@@ -119,23 +133,23 @@ public class SolrLogLayout extends Layout {
   }
 
   @Override
-  public String format(LoggingEvent event) {
+  public String toSerializable(LogEvent event) {
     return _format(event);
   }
   
-  public String _format(LoggingEvent event) {
-    String message = (String) event.getMessage();
+  public String _format(LogEvent event) {
+    String message = event.getMessage().getFormattedMessage();
     if (message == null) {
       message = "";
     }
     StringBuilder sb = new StringBuilder(message.length() + 80);
     
-    long now = event.timeStamp;
+    long now = event.getTimeMillis();
     long timeFromStart = now - startTime;
     long timeSinceLast = now - lastTime;
     lastTime = now;
-    String shortClassName = getShortClassName(event.getLocationInformation().getClassName(),
-        event.getLocationInformation().getMethodName());
+    String shortClassName = getShortClassName(event.getSource().getClassName(),
+        event.getSource().getMethodName());
     
     /***
      * sb.append(timeFromStart).append(' ').append(timeSinceLast);
@@ -212,21 +226,20 @@ public class SolrLogLayout extends Layout {
     
     sb.append(' ');
     appendMultiLineString(sb, message);
-    ThrowableInformation thInfo = event.getThrowableInformation();
-    if (thInfo != null) {
-      Throwable th = event.getThrowableInformation().getThrowable();
-      if (th != null) {
-        sb.append(' ');
-        String err = SolrException.toStr(th);
-        String ignoredMsg = SolrException.doIgnore(th, err);
-        if (ignoredMsg != null) {
-          sb.append(ignoredMsg);
-        } else {
-          sb.append(err);
-        }
+    Throwable th = event.getThrown();
+    
+    if (th != null) {
+      sb.append(' ');
+      String err = SolrException.toStr(th);
+      String ignoredMsg = SolrException.doIgnore(th, err);
+      if (ignoredMsg != null) {
+        sb.append(ignoredMsg);
+      } else {
+        sb.append(err);
       }
     }
     
+    
     sb.append('\n');
     
     /***
@@ -363,14 +376,6 @@ public class SolrLogLayout extends Layout {
     return sb.toString() + '.' + method;
   }
 
-  @Override
-  public void activateOptions() {}
-
-  @Override
-  public boolean ignoresThrowable() {
-    return false;
-  }
-
 
   private void appendMDC(StringBuilder sb) {
     if (!StringUtils.isEmpty(MDC.get(NODE_NAME_PROP)))  {

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/java/org/apache/solr/util/StartupLoggingUtils.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/util/StartupLoggingUtils.java b/solr/core/src/java/org/apache/solr/util/StartupLoggingUtils.java
index c582eff..7dded81 100644
--- a/solr/core/src/java/org/apache/solr/util/StartupLoggingUtils.java
+++ b/solr/core/src/java/org/apache/solr/util/StartupLoggingUtils.java
@@ -18,12 +18,15 @@
 package org.apache.solr.util;
 
 import java.lang.invoke.MethodHandles;
-import java.util.Enumeration;
+import java.util.Map;
 
-import org.apache.log4j.Appender;
-import org.apache.log4j.ConsoleAppender;
-import org.apache.log4j.Level;
-import org.apache.log4j.LogManager;
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.core.Appender;
+import org.apache.logging.log4j.core.LoggerContext;
+import org.apache.logging.log4j.core.appender.ConsoleAppender;
+import org.apache.logging.log4j.core.config.Configuration;
+import org.apache.logging.log4j.core.config.LoggerConfig;
 import org.apache.solr.common.util.SuppressForbidden;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -49,6 +52,10 @@ public final class StartupLoggingUtils {
     }
   }
 
+  public static String getLoggerImplStr() {
+    return binder.getLoggerFactoryClassStr();
+  }
+
   /**
    * Disables all log4j ConsoleAppender's by modifying log4j configuration dynamically.
    * Must only be used during early startup
@@ -61,15 +68,16 @@ public final class StartupLoggingUtils {
         logNotSupported("Could not mute logging to console.");
         return false;
       }
-      org.apache.log4j.Logger rootLogger = LogManager.getRootLogger();
-      Enumeration appenders = rootLogger.getAllAppenders();
-      while (appenders.hasMoreElements()) {
-        Appender appender = (Appender) appenders.nextElement();
+      LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
+      Configuration config = ctx.getConfiguration();
+      LoggerConfig loggerConfig = config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME);
+      Map<String, Appender> appenders = loggerConfig.getAppenders();
+      appenders.forEach((name, appender) -> {
         if (appender instanceof ConsoleAppender) {
-          log.info("Property solr.log.muteconsole given. Muting ConsoleAppender named " + appender.getName());
-          rootLogger.removeAppender(appender);
+          loggerConfig.removeAppender(name);
+          ctx.updateLoggers();
         }
-      }
+      });
       return true;
     } catch (Exception e) {
       logNotSupported("Could not mute logging to console.");
@@ -89,7 +97,12 @@ public final class StartupLoggingUtils {
         logNotSupported("Could not change log level.");
         return false;
       }
-      LogManager.getRootLogger().setLevel(Level.toLevel(logLevel, Level.INFO));
+
+      LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
+      Configuration config = ctx.getConfiguration();
+      LoggerConfig loggerConfig = config.getRootLogger();
+      loggerConfig.setLevel(Level.toLevel(logLevel, Level.INFO));
+      ctx.updateLoggers();
       return true;
     } catch (Exception e) {
       logNotSupported("Could not change log level.");

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/test-files/log4j.properties
----------------------------------------------------------------------
diff --git a/solr/core/src/test-files/log4j.properties b/solr/core/src/test-files/log4j.properties
deleted file mode 100644
index 969439a..0000000
--- a/solr/core/src/test-files/log4j.properties
+++ /dev/null
@@ -1,38 +0,0 @@
-#  Logging level
-log4j.rootLogger=INFO, CONSOLE
-
-log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
-log4j.appender.CONSOLE.Target=System.err
-log4j.appender.CONSOLE.layout=org.apache.log4j.EnhancedPatternLayout
-log4j.appender.CONSOLE.layout.ConversionPattern=%-4r %-5p (%t) [%X{node_name} %X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
-log4j.logger.org.apache.zookeeper=WARN
-log4j.logger.org.apache.hadoop=WARN
-log4j.logger.org.apache.directory=WARN
-log4j.logger.org.apache.solr.hadoop=INFO
-
-#log4j.logger.org.apache.solr.update.processor.LogUpdateProcessorFactory=DEBUG
-#log4j.logger.org.apache.solr.update.processor.DistributedUpdateProcessor=DEBUG
-#log4j.logger.org.apache.solr.update.PeerSync=DEBUG
-#log4j.logger.org.apache.solr.core.CoreContainer=DEBUG
-#log4j.logger.org.apache.solr.cloud.RecoveryStrategy=DEBUG
-#log4j.logger.org.apache.solr.cloud.SyncStrategy=DEBUG
-#log4j.logger.org.apache.solr.handler.admin.CoreAdminHandler=DEBUG
-#log4j.logger.org.apache.solr.cloud.ZkController=DEBUG
-#log4j.logger.org.apache.solr.update.DefaultSolrCoreState=DEBUG
-#log4j.logger.org.apache.solr.common.cloud.ConnectionManager=DEBUG
-#log4j.logger.org.apache.solr.update.UpdateLog=DEBUG
-#log4j.logger.org.apache.solr.cloud.ChaosMonkey=DEBUG
-#log4j.logger.org.apache.solr.update.TransactionLog=DEBUG
-#log4j.logger.org.apache.solr.handler.ReplicationHandler=DEBUG
-#log4j.logger.org.apache.solr.handler.IndexFetcher=DEBUG
-
-#log4j.logger.org.apache.solr.common.cloud.ClusterStateUtil=DEBUG
-#log4j.logger.org.apache.solr.cloud.OverseerAutoReplicaFailoverThread=DEBUG
-
-#log4j.logger.org.apache.http.wire=DEBUG
-#log4j.logger.org.apache.http.headers=DEBUG
-#log4j.logger.org.apache.http.impl.conn.PoolingHttpClientConnectionManager=DEBUG
-#log4j.logger.org.apache.http.impl.conn.BasicClientConnectionManager=DEBUG
-#log4j.logger.org.apache.http=DEBUG
-#log4j.logger.org.apache.solr.client.solrj.impl.SolrHttpRequestRetryHandler=DEBUG
-#log4j.logger.org.eclipse.jetty=DEBUG

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/test-files/log4j2.xml
----------------------------------------------------------------------
diff --git a/solr/core/src/test-files/log4j2.xml b/solr/core/src/test-files/log4j2.xml
new file mode 100644
index 0000000..7d0ebf7
--- /dev/null
+++ b/solr/core/src/test-files/log4j2.xml
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<Configuration>
+  <Appenders>
+    <Console name="STDERR" target="SYSTEM_ERR">
+      <PatternLayout>
+        <Pattern>
+          %-4r %-5p (%t) [%X{node_name} %X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
+        </Pattern>
+      </PatternLayout>
+    </Console>
+  </Appenders>
+  <Loggers>
+    <Logger name="org.apache.zookeeper" level="WARN"/>
+    <Logger name="org.apache.hadoop" level="WARN"/>
+    <Logger name="org.apache.directory" level="WARN"/>
+    <Logger name="org.apache.solr.hadoop" level="INFO"/>
+
+    <Root level="INFO">
+      <AppenderRef ref="STDERR"/>
+    </Root>
+  </Loggers>
+</Configuration>

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/624d128b/solr/core/src/test/org/apache/solr/handler/RequestLoggingTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/handler/RequestLoggingTest.java b/solr/core/src/test/org/apache/solr/handler/RequestLoggingTest.java
index 4c780cc..af37940 100644
--- a/solr/core/src/test/org/apache/solr/handler/RequestLoggingTest.java
+++ b/solr/core/src/test/org/apache/solr/handler/RequestLoggingTest.java
@@ -20,11 +20,14 @@ import java.io.StringWriter;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-import org.apache.log4j.Appender;
-import org.apache.log4j.Level;
-import org.apache.log4j.Logger;
-import org.apache.log4j.SimpleLayout;
-import org.apache.log4j.WriterAppender;
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.core.Appender;
+import org.apache.logging.log4j.core.LoggerContext;
+import org.apache.logging.log4j.core.appender.WriterAppender;
+import org.apache.logging.log4j.core.config.LoggerConfig;
+import org.apache.logging.log4j.core.layout.PatternLayout;
 import org.apache.solr.SolrTestCaseJ4;
 import org.apache.solr.common.util.SuppressForbidden;
 import org.apache.solr.core.SolrCore;
@@ -44,26 +47,40 @@ public class RequestLoggingTest extends SolrTestCaseJ4 {
 
   @Before
   public void setupAppender() {
+    LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
+    LoggerConfig config = ctx.getConfiguration().getLoggerConfig("RequestLoggingTest");
+
     writer = new StringWriter();
-    appender = new WriterAppender(new SimpleLayout(), writer);
+    appender = WriterAppender.createAppender(
+      PatternLayout
+        .newBuilder()
+        .withPattern("%-5p [%t]: %m%n")
+        .build(), 
+        null, writer, "RequestLoggingTest", false, true);
+    appender.start();
+    
   }
 
   @Test
   public void testLogBeforeExecuteWithCoreLogger() {
-    Logger logger = Logger.getLogger(SolrCore.class);
+    Logger logger = LogManager.getLogger(SolrCore.class);
     testLogBeforeExecute(logger);
   }
 
   @Test
   public void testLogBeforeExecuteWithRequestLogger() {
-    Logger logger = Logger.getLogger("org.apache.solr.core.SolrCore.Request");
+    Logger logger = LogManager.getLogger("org.apache.solr.core.SolrCore.Request");
     testLogBeforeExecute(logger);
   }
 
   public void testLogBeforeExecute(Logger logger) {
     Level level = logger.getLevel();
-    logger.setLevel(Level.DEBUG);
-    logger.addAppender(appender);
+    
+    LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
+    LoggerConfig config = ctx.getConfiguration().getLoggerConfig(logger.getName());
+    config.setLevel(Level.DEBUG);
+    config.addAppender(appender, Level.DEBUG, null);
+    ctx.updateLoggers();
 
     try {
       assertQ(req("q", "*:*"));
@@ -77,8 +94,9 @@ public class RequestLoggingTest extends SolrTestCaseJ4 {
       assertFalse(msg, group.contains("status"));
       assertFalse(msg, group.contains("QTime"));
     } finally {
-      logger.setLevel(level);
-      logger.removeAppender(appender);
+      config.setLevel(level);
+      config.removeAppender(appender.getName());
+      ctx.updateLoggers();
     }
   }
 }