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Posted to commits@knox.apache.org by kr...@apache.org on 2018/12/10 18:20:20 UTC

[1/3] knox git commit: KNOX-1615 - Enable PMD for source analysis

Repository: knox
Updated Branches:
  refs/heads/master f54e9d2d4 -> 6a35473a9


http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/api/CorrelationServiceFactory.java
----------------------------------------------------------------------
diff --git a/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/api/CorrelationServiceFactory.java b/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/api/CorrelationServiceFactory.java
index 200636f..a7e5dbd 100644
--- a/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/api/CorrelationServiceFactory.java
+++ b/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/api/CorrelationServiceFactory.java
@@ -23,7 +23,7 @@ import org.apache.knox.gateway.audit.log4j.correlation.Log4jCorrelationService;
 public abstract class CorrelationServiceFactory {
 
   // The global correlation service instance.
-  private static CorrelationService correlationService = null;
+  private static CorrelationService correlationService;
 
   // To prevent instantiation.
   private CorrelationServiceFactory() {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/log4j/appender/JdbmQueue.java
----------------------------------------------------------------------
diff --git a/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/log4j/appender/JdbmQueue.java b/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/log4j/appender/JdbmQueue.java
index f9e4f56..eb0fbd1 100644
--- a/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/log4j/appender/JdbmQueue.java
+++ b/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/log4j/appender/JdbmQueue.java
@@ -160,8 +160,8 @@ public class JdbmQueue<E> {
   private static final class Stat implements Serializable {
 
     private static final long serialVersionUID = 1L;
-    private long lastEnqueue = 0;
-    private long nextDequeue = 0;
+    private long lastEnqueue;
+    private long nextDequeue;
     private long size() {
       return lastEnqueue - nextDequeue;
     }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/log4j/audit/Log4jAuditor.java
----------------------------------------------------------------------
diff --git a/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/log4j/audit/Log4jAuditor.java b/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/log4j/audit/Log4jAuditor.java
index a70887b..3050871 100644
--- a/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/log4j/audit/Log4jAuditor.java
+++ b/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/log4j/audit/Log4jAuditor.java
@@ -161,7 +161,7 @@ public class Log4jAuditor implements Auditor {
             }
           }
           if (i < (query.length -1) ) {
-            newQuery.append("&");
+            newQuery.append('&');
           }
         }
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-common/src/main/java/org/apache/knox/gateway/util/JsonPath.java
----------------------------------------------------------------------
diff --git a/gateway-util-common/src/main/java/org/apache/knox/gateway/util/JsonPath.java b/gateway-util-common/src/main/java/org/apache/knox/gateway/util/JsonPath.java
index d231f34..48d2e65 100644
--- a/gateway-util-common/src/main/java/org/apache/knox/gateway/util/JsonPath.java
+++ b/gateway-util-common/src/main/java/org/apache/knox/gateway/util/JsonPath.java
@@ -312,18 +312,18 @@ public class JsonPath {
 
     @Override
     public String toString() {
-      StringBuilder s = new StringBuilder();
+      StringBuilder s = new StringBuilder(32);
       s.append( "JsonPath.Expression{" );
       for( int i=0, n=segments.size(); i<n; i++ ) {
         if( i > 0 ) {
-          s.append( "," );
+          s.append(',');
         }
         s.append( "segment[" );
         s.append( i );
         s.append( "]=" );
         s.append( segments.get( i ) );
       }
-      s.append( "]" );
+      s.append(']');
       return s.toString();
     }
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-common/src/main/java/org/apache/knox/gateway/util/X500PrincipalParser.java
----------------------------------------------------------------------
diff --git a/gateway-util-common/src/main/java/org/apache/knox/gateway/util/X500PrincipalParser.java b/gateway-util-common/src/main/java/org/apache/knox/gateway/util/X500PrincipalParser.java
index 7f5c52e..78199ac 100644
--- a/gateway-util-common/src/main/java/org/apache/knox/gateway/util/X500PrincipalParser.java
+++ b/gateway-util-common/src/main/java/org/apache/knox/gateway/util/X500PrincipalParser.java
@@ -57,7 +57,7 @@ public class X500PrincipalParser
 
       if (namePart.startsWith(searchPart)) {
         // Return the string starting after the ID string and the = sign that follows it.
-        retList.add(namePart.toString().substring(searchPart.length()));
+        retList.add(namePart.substring(searchPart.length()));
       }
     }
 
@@ -128,7 +128,7 @@ public class X500PrincipalParser
 
       if (namePart.startsWith(searchPart)) {
         // Return the string starting after the ID string and the = sign that follows it.
-        retNamePart = namePart.toString().substring(searchPart.length());
+        retNamePart = namePart.substring(searchPart.length());
         // By definition the first one is most significant
         if (significance == MOSTSIGNIFICANT)
           break;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-common/src/main/java/org/apache/knox/gateway/util/XmlUtils.java
----------------------------------------------------------------------
diff --git a/gateway-util-common/src/main/java/org/apache/knox/gateway/util/XmlUtils.java b/gateway-util-common/src/main/java/org/apache/knox/gateway/util/XmlUtils.java
index 15a09cc..9a15dba 100644
--- a/gateway-util-common/src/main/java/org/apache/knox/gateway/util/XmlUtils.java
+++ b/gateway-util-common/src/main/java/org/apache/knox/gateway/util/XmlUtils.java
@@ -17,10 +17,10 @@
 package org.apache.knox.gateway.util;
 
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.Writer;
+import java.nio.file.Files;
 
 import javax.xml.XMLConstants;
 import javax.xml.parsers.DocumentBuilder;
@@ -40,7 +40,7 @@ import org.xml.sax.SAXException;
 public class XmlUtils {
 
   public static Document readXml( File file ) throws ParserConfigurationException, IOException, SAXException {
-    return readXml( new FileInputStream( file ));
+    return readXml(Files.newInputStream(file.toPath()));
   }
 
   public static Document readXml( InputStream input ) throws ParserConfigurationException, IOException, SAXException {
@@ -84,7 +84,7 @@ public class XmlUtils {
     }
     if ( indent ) {
       t.setOutputProperty( OutputKeys.INDENT, "yes" );
-      t.setOutputProperty( "{xml.apache.org/xslt}indent-amount", "" + indentNumber );
+      t.setOutputProperty( "{xml.apache.org/xslt}indent-amount", String.valueOf(indentNumber) );
     }
     if ( omitXmlDeclaration ) {
       t.setOutputProperty( OutputKeys.OMIT_XML_DECLARATION, "yes" );

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-common/src/test/java/org/apache/knox/gateway/util/IpAddressValidatorTest.java
----------------------------------------------------------------------
diff --git a/gateway-util-common/src/test/java/org/apache/knox/gateway/util/IpAddressValidatorTest.java b/gateway-util-common/src/test/java/org/apache/knox/gateway/util/IpAddressValidatorTest.java
index d1d4bf5..5ca2c81 100644
--- a/gateway-util-common/src/test/java/org/apache/knox/gateway/util/IpAddressValidatorTest.java
+++ b/gateway-util-common/src/test/java/org/apache/knox/gateway/util/IpAddressValidatorTest.java
@@ -22,7 +22,7 @@ import org.junit.Test;
 public class IpAddressValidatorTest extends org.junit.Assert {
   String test = "127.0.0.1,193.*,192.168.1.*,0:0:0:0:0:0:0:1,0:0:0:0:0:0:*";
   String testWeirdConfig = ",127.0.0.1,,193.*,192.168.1.*,29*";
-  String testNullConfig = null;
+  String testNullConfig;
 
   @Test
   public void testExplicitIpAddress() throws Exception {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-configinjector/src/main/java/org/apache/knox/gateway/config/ConfigurationInjectorBuilder.java
----------------------------------------------------------------------
diff --git a/gateway-util-configinjector/src/main/java/org/apache/knox/gateway/config/ConfigurationInjectorBuilder.java b/gateway-util-configinjector/src/main/java/org/apache/knox/gateway/config/ConfigurationInjectorBuilder.java
index a9a4db5..dcc2c10 100755
--- a/gateway-util-configinjector/src/main/java/org/apache/knox/gateway/config/ConfigurationInjectorBuilder.java
+++ b/gateway-util-configinjector/src/main/java/org/apache/knox/gateway/config/ConfigurationInjectorBuilder.java
@@ -29,7 +29,7 @@ import java.util.ServiceLoader;
 public class ConfigurationInjectorBuilder {
 
   private static ConfigurationBinding DEFAULT_BINDING = new DefaultConfigurationBinding();
-  private static ConfigurationInjector INSTANCE = null;
+  private static ConfigurationInjector INSTANCE;
 
   private static synchronized ConfigurationInjector getInjector() {
     if( INSTANCE == null ) {
@@ -57,9 +57,9 @@ public class ConfigurationInjectorBuilder {
     return injector;
   }
 
-  private Object target = null;
-  private ConfigurationAdapter source = null;
-  private ConfigurationBinding binding = null;
+  private Object target;
+  private ConfigurationAdapter source;
+  private ConfigurationBinding binding;
 
   public static ConfigurationInjectorBuilder configuration() {
     return new ConfigurationInjectorBuilder();

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-configinjector/src/main/java/org/apache/knox/gateway/config/impl/ConfigurationAdapterFactory.java
----------------------------------------------------------------------
diff --git a/gateway-util-configinjector/src/main/java/org/apache/knox/gateway/config/impl/ConfigurationAdapterFactory.java b/gateway-util-configinjector/src/main/java/org/apache/knox/gateway/config/impl/ConfigurationAdapterFactory.java
index da9b78c..14c2589 100755
--- a/gateway-util-configinjector/src/main/java/org/apache/knox/gateway/config/impl/ConfigurationAdapterFactory.java
+++ b/gateway-util-configinjector/src/main/java/org/apache/knox/gateway/config/impl/ConfigurationAdapterFactory.java
@@ -31,7 +31,7 @@ import java.util.ServiceLoader;
 
 public class ConfigurationAdapterFactory {
 
-  private static Map<Class<?>, Class<? extends ConfigurationAdapter>> ADAPTERS = null;
+  private static Map<Class<?>, Class<? extends ConfigurationAdapter>> ADAPTERS;
 
   private static synchronized Map<Class<?>, Class<? extends ConfigurationAdapter>> getAdapters() {
     if( ADAPTERS == null ) {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-configinjector/src/test/java/org/apache/knox/gateway/config/AdapterSampleTest.java
----------------------------------------------------------------------
diff --git a/gateway-util-configinjector/src/test/java/org/apache/knox/gateway/config/AdapterSampleTest.java b/gateway-util-configinjector/src/test/java/org/apache/knox/gateway/config/AdapterSampleTest.java
index d6030dd..8d85462 100755
--- a/gateway-util-configinjector/src/test/java/org/apache/knox/gateway/config/AdapterSampleTest.java
+++ b/gateway-util-configinjector/src/test/java/org/apache/knox/gateway/config/AdapterSampleTest.java
@@ -30,7 +30,7 @@ public class AdapterSampleTest {
 
   private static class Target {
     @Configure
-    private String username = null;
+    private String username;
   }
 
   private static class Adapter implements ConfigurationAdapter {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-configinjector/src/test/java/org/apache/knox/gateway/config/FuncTest.java
----------------------------------------------------------------------
diff --git a/gateway-util-configinjector/src/test/java/org/apache/knox/gateway/config/FuncTest.java b/gateway-util-configinjector/src/test/java/org/apache/knox/gateway/config/FuncTest.java
index 7e40212..3452c95 100755
--- a/gateway-util-configinjector/src/test/java/org/apache/knox/gateway/config/FuncTest.java
+++ b/gateway-util-configinjector/src/test/java/org/apache/knox/gateway/config/FuncTest.java
@@ -72,7 +72,7 @@ public class FuncTest {
     }
     String multiArgStringField = "default";
     Integer multiArgIntegerField = 0;
-    int multiArgIntField = 0;
+    int multiArgIntField;
 
   }
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-launcher/src/main/java/org/apache/knox/gateway/launcher/Launcher.java
----------------------------------------------------------------------
diff --git a/gateway-util-launcher/src/main/java/org/apache/knox/gateway/launcher/Launcher.java b/gateway-util-launcher/src/main/java/org/apache/knox/gateway/launcher/Launcher.java
index 92092dc..58700e2 100644
--- a/gateway-util-launcher/src/main/java/org/apache/knox/gateway/launcher/Launcher.java
+++ b/gateway-util-launcher/src/main/java/org/apache/knox/gateway/launcher/Launcher.java
@@ -18,7 +18,6 @@
 package org.apache.knox.gateway.launcher;
 
 import java.io.File;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -27,6 +26,7 @@ import java.lang.reflect.InvocationTargetException;
 import java.net.URL;
 import java.net.URLDecoder;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.util.Properties;
 
 public class Launcher {
@@ -116,7 +116,7 @@ public class Launcher {
   private static void createExternalConfig( File file, Properties config, URL src ) throws IOException {
     try {
       if( file.createNewFile() ){
-        try (OutputStream output = new FileOutputStream(file)) {
+        try (OutputStream output = Files.newOutputStream(file.toPath())) {
           config.store(output, "Created from " + src);
         }
       }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Expander.java
----------------------------------------------------------------------
diff --git a/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Expander.java b/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Expander.java
index abf9b6b..d239b0a 100644
--- a/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Expander.java
+++ b/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Expander.java
@@ -70,7 +70,7 @@ public class Expander {
     Segment segment = template.getScheme();
     if( segment != null ) {
       expandSingleValue( template.getScheme(), names, params, evaluator, builder );
-      builder.append( ":" );
+      builder.append(':');
     }
   }
 
@@ -85,17 +85,17 @@ public class Expander {
       Segment port = template.getPort();
       expandSingleValue( username, names, params, evaluator, builder );
       if( password != null ) {
-        builder.append( ":" );
+        builder.append(':');
         expandSingleValue( password, names, params, evaluator, builder );
       }
       if( username != null || password != null ) {
-        builder.append( "@" );
+        builder.append('@');
       }
       if( host != null ) {
         expandSingleValue( host, names, params, evaluator, builder );
       }
       if( port != null ) {
-        builder.append( ":" );
+        builder.append(':');
         expandSingleValue( port, names, params, evaluator, builder );
       }
     }
@@ -103,12 +103,12 @@ public class Expander {
 
   private static void expandPath( Template template, Set<String> names, Params params, Evaluator evaluator, StringBuilder builder ) {
     if( template.isAbsolute() ) {
-      builder.append( "/" );
+      builder.append('/');
     }
     List<Path> path = template.getPath();
     for( int i=0, n=path.size(); i<n; i++ ) {
       if( i > 0 ) {
-        builder.append( "/" );
+        builder.append('/');
       }
       Path segment = path.get( i );
       String name = segment.getParamName();
@@ -130,7 +130,7 @@ public class Expander {
       }
     }
     if( template.isDirectory() && !path.isEmpty() ) {
-      builder.append( "/" );
+      builder.append('/');
     }
   }
 
@@ -141,7 +141,7 @@ public class Expander {
       if( type == Segment.GLOB || type == Segment.DEFAULT ) {
         for( int i=0, n=values.size(); i<n; i++ ) {
           if( i > 0 ) {
-            builder.append( "/" );
+            builder.append( '/' );
           }
           builder.append( values.get( i ) );
         }
@@ -169,9 +169,9 @@ public class Expander {
       for (Query query1 : query) {
         int i = index.incrementAndGet();
         if (i == 1) {
-          builder.append("?");
+          builder.append('?');
         } else {
-          builder.append("&");
+          builder.append('&');
         }
         String queryName = query1.getQueryName();
         String paramName = query1.getParamName();
@@ -183,7 +183,7 @@ public class Expander {
             builder.append(queryName);
             String pattern = value.getOriginalPattern();
             if (pattern != null) {
-              builder.append("=");
+              builder.append('=');
               builder.append(pattern);
             }
             break;
@@ -214,13 +214,13 @@ public class Expander {
           for( String value: values ) {
             int i = index.incrementAndGet();
             if( i == 1 ) {
-              builder.append( "?" );
+              builder.append('?');
             } else {
-              builder.append( "&" );
+              builder.append('&');
             }
             appendQueryPart(name, builder);
             if( value != null ) {
-              builder.append( "=" );
+              builder.append('=');
               appendQueryPart(value, builder);
             }
           }
@@ -238,12 +238,12 @@ public class Expander {
       if( type == Segment.GLOB || type == Segment.DEFAULT ) {
         for( int i=0, n=values.size(); i<n; i++ ) {
           if( i > 0 ) {
-            builder.append( "&" );
+            builder.append('&');
           }
           appendQueryPart(queryName, builder);
           value = values.get( i );
           if( value != null ) {
-            builder.append( "=" );
+            builder.append('=');
             appendQueryPart(value, builder);
           }
         }
@@ -251,7 +251,7 @@ public class Expander {
         appendQueryPart(queryName, builder);
         value = values.get( 0 );
         if( value != null ) {
-          builder.append( "=" );
+          builder.append('=');
           appendQueryPart(value, builder);
         }
       }
@@ -268,7 +268,7 @@ public class Expander {
 
   private static void expandFragment( Template template, Set<String> names, Params params, Evaluator evaluator, StringBuilder builder ) {
     if( template.hasFragment() ) {
-      builder.append( "#" );
+      builder.append('#');
     }
     expandSingleValue( template.getFragment(), names, params, evaluator, builder );
   }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Function.java
----------------------------------------------------------------------
diff --git a/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Function.java b/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Function.java
index bb13109..e11c5a3 100644
--- a/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Function.java
+++ b/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Function.java
@@ -25,9 +25,9 @@ class Function {
 
   private enum State { UNKNOWN, FUNCTION, VARIABLE, LITERAL }
 
-  private String funcName = null;
-  private String paramName = null;
-  private List<String> paramValue = null;
+  private String funcName;
+  private String paramName;
+  private List<String> paramValue;
 
   static List<String> evaluate( String statement, Resolver resolver, Evaluator evaluator ) {
     Function function = new Function( statement );

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Segment.java
----------------------------------------------------------------------
diff --git a/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Segment.java b/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Segment.java
index 04dd89f..67c284e 100644
--- a/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Segment.java
+++ b/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Segment.java
@@ -143,15 +143,15 @@ abstract class Segment {
     } else if( values.isEmpty() ) {
       s.append( "empty" );
     } else {
-      s.append( "[" );
+      s.append('[');
       Iterator i = values.iterator();
       while( i.hasNext() ) {
         s.append( i.next() );
         if( i.hasNext() ) {
-          s.append( "," );
+          s.append(',');
         }
       }
-      s.append( "]" );
+      s.append(']');
     }
     return s.toString();
   }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Template.java
----------------------------------------------------------------------
diff --git a/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Template.java b/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Template.java
index ca830f1..1293646 100644
--- a/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Template.java
+++ b/gateway-util-urltemplate/src/main/java/org/apache/knox/gateway/util/urltemplate/Template.java
@@ -171,7 +171,7 @@ public class Template {
           b.append( ':' );
           buildSegmentValue( b, password, password.getFirstValue() );
         }
-        b.append( "@" );
+        b.append( '@' );
       }
       if( host != null ) {
         buildSegmentValue( b, host, host.getFirstValue() );
@@ -186,7 +186,7 @@ public class Template {
   private void buildSegmentValue( StringBuilder b, Segment s, Segment.Value v ) {
     String paramName = s.getParamName();
     if( paramName != null && !paramName.isEmpty()) {
-      b.append( "{" );
+      b.append( '{' );
       b.append( s.getParamName() );
       String actualPattern = v.getToken().originalPattern;
       if( ( actualPattern != null ) && ( v.getType() != Segment.DEFAULT ) )  {
@@ -213,7 +213,7 @@ public class Template {
       String paramName = segment.getParamName();
       Segment.Value firstValue = segment.getFirstValue();
       if( paramName != null && !paramName.isEmpty()) {
-        b.append( "{" );
+        b.append( '{' );
         b.append( segment.getParamName() );
         String pattern = firstValue.getOriginalPattern();
         if( pattern != null && !pattern.isEmpty() ) {
@@ -284,9 +284,9 @@ public class Template {
     if( paramName != null && !paramName.isEmpty()) {
       if( !Segment.GLOB_PATTERN.equals( queryName ) && !Segment.STAR_PATTERN.equals( queryName ) ) {
         b.append( segment.getQueryName() );
-        b.append( "=" );
+        b.append( '=' );
       }
-      b.append( "{" );
+      b.append( '{' );
       b.append( segment.getParamName() );
       if( valuePattern != null ) {
         b.append( '=' );
@@ -296,7 +296,7 @@ public class Template {
     } else {
       b.append( queryName );
       if( valuePattern != null ) {
-        b.append( "=" );
+        b.append( '=' );
         b.append( valuePattern );
       }
     }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/pom.xml
----------------------------------------------------------------------
diff --git a/pom.xml b/pom.xml
index 1b8db03..3bcc455 100644
--- a/pom.xml
+++ b/pom.xml
@@ -197,6 +197,7 @@
         <maven-compiler-plugin.version>3.8.0</maven-compiler-plugin.version>
         <maven-dependency-plugin.version>3.1.1</maven-dependency-plugin.version>
         <maven-enforcer-plugin.version>3.0.0-M2</maven-enforcer-plugin.version>
+        <maven-pmd-plugin.version>3.11.0</maven-pmd-plugin.version>
         <metrics.version>4.0.3</metrics.version>
         <nimbus-jose-jwt.version>6.0.2</nimbus-jose-jwt.version>
         <okhttp.version>2.7.5</okhttp.version>
@@ -618,6 +619,32 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-pmd-plugin</artifactId>
+                <version>${maven-pmd-plugin.version}</version>
+                <configuration>
+                    <rulesets>
+                        <ruleset>build-tools/pmd/pmd-ruleset.xml</ruleset>
+                    </rulesets>
+                    <printFailingErrors>true</printFailingErrors>
+                    <targetJdk>1.8</targetJdk>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <dependencies>
+                    <dependency>
+                        <groupId>org.apache.knox</groupId>
+                        <artifactId>build-tools</artifactId>
+                        <version>1.0.0</version>
+                    </dependency>
+                </dependencies>
+            </plugin>
         </plugins>
     </build>
 
@@ -661,6 +688,15 @@
                     </reportSet>
                 </reportSets>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-pmd-plugin</artifactId>
+                <configuration>
+                    <rulesets>
+                        <ruleset>build-tools/pmd/pmd-ruleset.xml</ruleset>
+                    </rulesets>
+                </configuration>
+            </plugin>
         </plugins>
     </reporting>
 


[3/3] knox git commit: KNOX-1615 - Enable PMD for source analysis

Posted by kr...@apache.org.
KNOX-1615 - Enable PMD for source analysis

Signed-off-by: Kevin Risden <kr...@apache.org>


Project: http://git-wip-us.apache.org/repos/asf/knox/repo
Commit: http://git-wip-us.apache.org/repos/asf/knox/commit/6a35473a
Tree: http://git-wip-us.apache.org/repos/asf/knox/tree/6a35473a
Diff: http://git-wip-us.apache.org/repos/asf/knox/diff/6a35473a

Branch: refs/heads/master
Commit: 6a35473a9ccf411e32a8681b9005a032d6473afa
Parents: f54e9d2
Author: Kevin Risden <kr...@apache.org>
Authored: Mon Dec 10 11:52:52 2018 -0500
Committer: Kevin Risden <kr...@apache.org>
Committed: Mon Dec 10 11:56:40 2018 -0500

----------------------------------------------------------------------
 .../resources/build-tools/pmd/pmd-ruleset.xml   | 44 ++++++++++++++
 .../discovery/ambari/AmbariCluster.java         |  9 +--
 .../ambari/AmbariConfigurationMonitor.java      | 14 ++---
 .../ambari/AmbariDynamicServiceURLCreator.java  |  6 +-
 .../ambari/AmbariServiceDiscovery.java          |  7 ++-
 .../discovery/ambari/HDFSURLCreatorBase.java    |  2 +-
 .../discovery/ambari/NameNodeUrlCreator.java    |  2 +-
 .../discovery/ambari/NiFiURLCreator.java        |  2 +-
 .../ambari/ResourceManagerURLCreatorBase.java   |  2 +-
 .../ambari/ServiceURLPropertyConfig.java        |  4 +-
 .../ambari/SparkCommonServiceURLCreator.java    |  8 +--
 .../ambari/AmbariConfigurationMonitorTest.java  |  2 +-
 .../i18n/resources/ResourcesInvoker.java        | 10 +--
 .../provider/impl/AtlasZookeeperURLManager.java |  6 --
 .../provider/impl/KafkaZookeeperURLManager.java |  8 +--
 ...entityAsserterHttpServletRequestWrapper.java |  4 +-
 .../CommonIdentityAssertionFilterTest.java      |  6 +-
 .../filter/ConcatIdentityAssertionFilter.java   |  4 +-
 .../filter/RegexIdentityAssertionFilter.java    |  4 +-
 .../hostmap/impl/HostmapFunctionProcessor.java  |  2 +-
 .../ServiceMappedAddressFunctionProcessor.java  |  2 +-
 .../SecureQueryDecryptProcessor.java            |  2 +-
 .../filter/rewrite/impl/UrlRewriteRequest.java  | 12 ++--
 .../filter/rewrite/impl/UrlRewriteResponse.java |  3 +-
 .../rewrite/impl/html/HtmlFilterReaderBase.java |  2 +-
 .../impl/html/HtmlImportFunctionProcessor.java  |  3 +-
 .../gateway/filter/AclsAuthorizationFilter.java |  4 +-
 .../gateway/filter/AclsAuthzFilterTest.java     |  4 +-
 .../jwt/filter/AbstractJWTFilter.java           |  2 +-
 .../filter/JWTAccessTokenAssertionFilter.java   |  2 +-
 .../jwt/filter/JWTAuthCodeAssertionFilter.java  |  2 +-
 .../jwt/filter/SSOCookieFederationFilter.java   |  4 +-
 .../federation/AbstractJWTFilterTest.java       | 12 ++--
 .../pac4j/filter/Pac4jDispatcherFilter.java     |  6 +-
 .../gateway/pac4j/MockHttpServletResponse.java  |  2 +-
 .../filter/AbstractPreAuthFederationFilter.java |  2 +-
 .../filter/HeaderPreAuthFederationFilter.java   |  2 +-
 .../preauth/filter/PreAuthFederationFilter.java |  2 +-
 .../knox/gateway/deploy/impl/ShiroConfig.java   |  4 +-
 .../gateway/filter/RedirectToUrlFilter.java     |  2 +-
 .../knox/gateway/shirorealm/KnoxLdapRealm.java  |  2 +-
 .../webappsec/filter/CSRFPreventionFilter.java  |  2 +-
 .../webappsec/StrictTransportFilterTest.java    |  8 +--
 .../XContentTypeOptionsFilterTest.java          |  6 +-
 .../webappsec/XFrameOptionsFilterTest.java      |  8 +--
 .../webappsec/XSSProtectionFilterTest.java      |  6 +-
 .../gateway/filter/CompositeEnumeration.java    |  2 +-
 .../org/apache/knox/gateway/GatewayFilter.java  |  5 +-
 .../knox/gateway/GatewayForwardingServlet.java  |  2 +-
 .../org/apache/knox/gateway/GatewayServer.java  |  4 +-
 .../knox/gateway/deploy/DeploymentFactory.java  |  2 +-
 .../impl/ApplicationDeploymentContributor.java  | 12 ++--
 .../gateway/dispatch/UrlConnectionDispatch.java |  6 +-
 .../filter/PortMappingHelperHandler.java        |  2 +-
 .../gateway/services/CLIGatewayServices.java    |  4 +-
 .../services/DefaultGatewayServices.java        |  4 +-
 .../impl/instr/InstrumentedGatewayFilter.java   |  6 +-
 .../impl/reporters/AbstractMetricsReporter.java |  2 +-
 .../security/impl/DefaultCryptoService.java     |  6 +-
 .../security/impl/DefaultKeystoreService.java   |  8 +--
 .../services/security/impl/JettySSLService.java | 11 ++--
 .../impl/DefaultTokenAuthorityService.java      |  6 +-
 ...faultClusterConfigurationMonitorService.java |  2 +-
 .../topology/impl/DefaultTopologyService.java   |  2 +-
 .../DefaultServiceDiscoveryConfig.java          |  4 +-
 .../DefaultRemoteConfigurationMonitor.java      |  2 +-
 .../RemoteConfigurationMonitorFactory.java      |  2 +-
 .../simple/ProviderConfigurationParser.java     |  8 +--
 .../simple/SimpleDescriptorHandler.java         |  4 +-
 .../topology/simple/SimpleDescriptorImpl.java   |  2 +-
 .../topology/validation/TopologyValidator.java  |  7 +--
 .../knox/gateway/trace/AccessHandler.java       | 34 +++++------
 .../apache/knox/gateway/trace/TraceRequest.java | 16 +++--
 .../knox/gateway/trace/TraceResponse.java       |  4 +-
 .../apache/knox/gateway/trace/TraceUtil.java    |  4 +-
 .../org/apache/knox/gateway/util/KnoxCLI.java   | 36 +++++------
 .../gateway/util/ServiceDefinitionsLoader.java  |  6 +-
 .../websockets/GatewayWebsocketHandler.java     |  4 +-
 .../knox/gateway/jetty/SslSocketTest.java       |  2 +-
 .../services/security/CryptoServiceTest.java    |  4 +-
 .../simple/ProviderConfigurationParserTest.java |  2 +-
 .../websockets/ProxyInboundClientTest.java      |  4 +-
 .../gateway/websockets/WebsocketClient.java     |  8 +--
 .../service/admin/TopologiesResource.java       | 35 +++++------
 .../service/definition/CustomDispatch.java      |  2 +-
 .../apache/knox/gateway/hive/HiveDispatch.java  |  2 +-
 .../knox/gateway/hive/HiveHaDispatch.java       |  2 +-
 .../gateway/service/knoxsso/WebSSOResource.java | 18 +++---
 .../service/knoxsso/WebSSOutResource.java       |  2 +-
 .../service/knoxtoken/TokenResource.java        |  6 +-
 .../config/remote/zk/CuratorClientService.java  |  2 +-
 .../gateway/rm/dispatch/RMHaBaseDispatcher.java |  4 +-
 .../service/test/ServiceTestResource.java       | 64 +++++++-------------
 .../knox/gateway/shell/BasicResponse.java       |  2 +-
 .../knox/gateway/shell/ErrorResponse.java       |  2 +-
 .../apache/knox/gateway/shell/KnoxSession.java  |  6 +-
 .../org/apache/knox/gateway/shell/KnoxSh.java   | 14 +++--
 .../shell/KnoxTokenCredentialCollector.java     |  4 +-
 .../shell/hbase/table/row/DeleteRows.java       |  2 +-
 .../shell/hbase/table/row/QueryRows.java        |  8 +--
 .../apache/knox/gateway/shell/hdfs/Mkdir.java   |  4 +-
 .../org/apache/knox/gateway/shell/hdfs/Put.java |  2 +-
 .../gateway/dispatch/GatewayDispatchFilter.java |  2 +-
 .../gateway/dispatch/HadoopAuthCookieStore.java |  7 +--
 .../principal/SimplePrincipalMapper.java        |  4 +-
 .../security/impl/BaseKeystoreService.java      | 18 +++---
 .../security/impl/CMFMasterService.java         |  2 +-
 .../security/impl/X509CertificateUtil.java      |  7 ++-
 .../apache/knox/gateway/topology/Service.java   |  2 +-
 .../apache/knox/gateway/topology/Topology.java  |  4 +-
 .../dispatch/GatewayDispatchFilterTest.java     |  2 +-
 .../security/impl/CMFMasterServiceTest.java     |  2 +-
 .../apache/knox/gateway/GatewayTestConfig.java  | 16 ++---
 .../apache/knox/gateway/GatewayTestDriver.java  |  9 +--
 .../knox/test/mock/MockRequestMatcher.java      | 24 ++++----
 .../knox/test/mock/MockResponseProvider.java    | 20 +++---
 .../gateway/audit/api/AuditServiceFactory.java  |  2 +-
 .../audit/api/CorrelationServiceFactory.java    |  2 +-
 .../gateway/audit/log4j/appender/JdbmQueue.java |  4 +-
 .../gateway/audit/log4j/audit/Log4jAuditor.java |  2 +-
 .../org/apache/knox/gateway/util/JsonPath.java  |  6 +-
 .../knox/gateway/util/X500PrincipalParser.java  |  4 +-
 .../org/apache/knox/gateway/util/XmlUtils.java  |  6 +-
 .../gateway/util/IpAddressValidatorTest.java    |  2 +-
 .../config/ConfigurationInjectorBuilder.java    |  8 +--
 .../impl/ConfigurationAdapterFactory.java       |  2 +-
 .../knox/gateway/config/AdapterSampleTest.java  |  2 +-
 .../apache/knox/gateway/config/FuncTest.java    |  2 +-
 .../apache/knox/gateway/launcher/Launcher.java  |  4 +-
 .../knox/gateway/util/urltemplate/Expander.java | 36 +++++------
 .../knox/gateway/util/urltemplate/Function.java |  6 +-
 .../knox/gateway/util/urltemplate/Segment.java  |  6 +-
 .../knox/gateway/util/urltemplate/Template.java | 12 ++--
 pom.xml                                         | 36 +++++++++++
 134 files changed, 488 insertions(+), 445 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/build-tools/src/main/resources/build-tools/pmd/pmd-ruleset.xml
----------------------------------------------------------------------
diff --git a/build-tools/src/main/resources/build-tools/pmd/pmd-ruleset.xml b/build-tools/src/main/resources/build-tools/pmd/pmd-ruleset.xml
new file mode 100644
index 0000000..83896f7
--- /dev/null
+++ b/build-tools/src/main/resources/build-tools/pmd/pmd-ruleset.xml
@@ -0,0 +1,44 @@
+<?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.
+-->
+<ruleset xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         name="Maven PMD Plugin Ruleset"
+         xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 http://pmd.sourceforge.net/ruleset_2_0_0.xsd">
+    <description>Ruleset</description>
+    <!--<rule ref="category/java/bestpractices.xml">-->
+        <!--<exclude name="ConstantsInInterface" />-->
+    <!--</rule>-->
+    <!--<rule ref="category/java/codestyle.xml" />-->
+    <!--<rule ref="category/java/design.xml" />-->
+    <!--<rule ref="category/java/documentation.xml" />-->
+    <!--<rule ref="category/java/errorprone.xml">-->
+        <!--<exclude name="AvoidFieldNameMatchingMethodName" />-->
+        <!--<exclude name="BeanMembersShouldSerialize" />-->
+        <!--<exclude name="DataflowAnomalyAnalysis" />-->
+        <!--<exclude name="EmptyCatchBlock" />-->
+    <!--</rule>-->
+    <!--<rule ref="category/java/multithreading.xml" />-->
+    <rule ref="category/java/performance.xml">
+        <exclude name="AvoidInstantiatingObjectsInLoops" />
+        <exclude name="InefficientEmptyStringCheck" />
+        <exclude name="SimplifyStartsWith" />
+        <exclude name="TooFewBranchesForASwitchStatement" />
+        <exclude name="UseStringBufferForStringAppends" />
+    </rule>
+    <rule ref="category/java/security.xml" />
+</ruleset>
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariCluster.java
----------------------------------------------------------------------
diff --git a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariCluster.java b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariCluster.java
index f098b75..be47d63 100644
--- a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariCluster.java
+++ b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariCluster.java
@@ -20,8 +20,9 @@ import org.apache.knox.gateway.i18n.messages.MessagesFactory;
 import org.apache.knox.gateway.topology.discovery.ServiceDiscovery;
 
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -69,7 +70,7 @@ class AmbariCluster implements ServiceDiscovery.Cluster {
 
             if (overridesPath != null) {
                 Properties overrides = new Properties();
-                try (InputStream in = new FileInputStream(overridesPath)) {
+                try (InputStream in = Files.newInputStream(Paths.get(overridesPath))) {
                     overrides.load(in);
                     for (String name : overrides.stringPropertyNames()) {
                         zooKeeperHAConfigMappings.setProperty(name, overrides.getProperty(name));
@@ -260,9 +261,9 @@ class AmbariCluster implements ServiceDiscovery.Cluster {
                 if (portIndex > 0) {
                     host = host.substring(0, portIndex);
                 }
-                updatedEnsemble.append(host).append(":").append(port);
+                updatedEnsemble.append(host).append(':').append(port);
                 if (++index < hosts.length) {
-                    updatedEnsemble.append(",");
+                    updatedEnsemble.append(',');
                 }
             }
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariConfigurationMonitor.java
----------------------------------------------------------------------
diff --git a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariConfigurationMonitor.java b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariConfigurationMonitor.java
index 141df87..3f1b035 100644
--- a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariConfigurationMonitor.java
+++ b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariConfigurationMonitor.java
@@ -24,9 +24,10 @@ import org.apache.knox.gateway.topology.discovery.ClusterConfigurationMonitor;
 import org.apache.knox.gateway.topology.discovery.ServiceDiscoveryConfig;
 
 import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
@@ -37,7 +38,6 @@ import java.util.Properties;
 import java.util.concurrent.locks.ReadWriteLock;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
 
-
 class AmbariConfigurationMonitor implements ClusterConfigurationMonitor {
 
     private static final String TYPE = "Ambari";
@@ -116,7 +116,7 @@ class AmbariConfigurationMonitor implements ClusterConfigurationMonitor {
             Collection<File> persistedConfigs = FileUtils.listFiles(persistenceDir, new String[]{"conf"}, false);
             for (File persisted : persistedConfigs) {
                 Properties props = new Properties();
-                try (FileInputStream in = new FileInputStream(persisted)) {
+                try (InputStream in = Files.newInputStream(persisted.toPath())) {
                     props.load(in);
 
                     addDiscoveryConfig(props.getProperty(PROP_CLUSTER_NAME), new ServiceDiscoveryConfig() {
@@ -152,7 +152,7 @@ class AmbariConfigurationMonitor implements ClusterConfigurationMonitor {
             Collection<File> persistedConfigs = FileUtils.listFiles(persistenceDir, new String[]{"ver"}, false);
             for (File persisted : persistedConfigs) {
                 Properties props = new Properties();
-                try (FileInputStream in = new FileInputStream(persisted)) {
+                try (InputStream in = Files.newInputStream(persisted.toPath())) {
                     props.load(in);
 
                     String source = props.getProperty(PROP_CLUSTER_SOURCE);
@@ -210,7 +210,7 @@ class AmbariConfigurationMonitor implements ClusterConfigurationMonitor {
     }
 
     private void persist(Properties props, File dest) {
-        try (FileOutputStream out = new FileOutputStream(dest)) {
+        try (OutputStream out = Files.newOutputStream(dest.toPath())) {
             props.store(out, PERSISTED_FILE_COMMENT);
             out.flush();
         } catch (Exception e) {
@@ -472,7 +472,7 @@ class AmbariConfigurationMonitor implements ClusterConfigurationMonitor {
 
         private AmbariConfigurationMonitor delegate;
 
-        private boolean isActive = false;
+        private boolean isActive;
 
         PollingConfigAnalyzer(AmbariConfigurationMonitor delegate) {
             this.delegate = delegate;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariDynamicServiceURLCreator.java
----------------------------------------------------------------------
diff --git a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariDynamicServiceURLCreator.java b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariDynamicServiceURLCreator.java
index b81a53a..1ad1830 100644
--- a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariDynamicServiceURLCreator.java
+++ b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariDynamicServiceURLCreator.java
@@ -21,10 +21,10 @@ import org.apache.knox.gateway.topology.discovery.ServiceDiscovery;
 
 import java.io.ByteArrayInputStream;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -39,7 +39,7 @@ class AmbariDynamicServiceURLCreator implements ServiceURLCreator {
 
     private AmbariServiceDiscoveryMessages log = MessagesFactory.get(AmbariServiceDiscoveryMessages.class);
 
-    private AmbariCluster cluster = null;
+    private AmbariCluster cluster;
     private ServiceURLPropertyConfig config;
 
     AmbariDynamicServiceURLCreator() {
@@ -52,7 +52,7 @@ class AmbariDynamicServiceURLCreator implements ServiceURLCreator {
 
     AmbariDynamicServiceURLCreator(AmbariCluster cluster, File mappingConfiguration) throws IOException {
         this.cluster = cluster;
-        try (InputStream inputStream = new FileInputStream(mappingConfiguration)) {
+        try (InputStream inputStream = Files.newInputStream(mappingConfiguration.toPath())) {
           config = new ServiceURLPropertyConfig(inputStream);
         }
     }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariServiceDiscovery.java
----------------------------------------------------------------------
diff --git a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariServiceDiscovery.java b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariServiceDiscovery.java
index a1ceba2..b95fe81 100644
--- a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariServiceDiscovery.java
+++ b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariServiceDiscovery.java
@@ -29,9 +29,10 @@ import org.apache.knox.gateway.topology.discovery.ServiceDiscovery;
 import org.apache.knox.gateway.topology.discovery.ServiceDiscoveryConfig;
 
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.InputStream;
 import java.lang.reflect.Method;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -78,7 +79,7 @@ class AmbariServiceDiscovery implements ServiceDiscovery {
     // This is used to update the monitor when new cluster configuration details are discovered.
     private AmbariConfigurationMonitor configChangeMonitor;
 
-    private boolean isInitialized = false;
+    private boolean isInitialized;
 
     //
     static void initializeComponentConfigMappings(){
@@ -111,7 +112,7 @@ class AmbariServiceDiscovery implements ServiceDiscovery {
             // If there is an overrides configuration file specified either way, then apply it
             if (overridesPath != null) {
                 Properties overrides = new Properties();
-                try (InputStream in = new FileInputStream(overridesPath)) {
+                try (InputStream in = Files.newInputStream(Paths.get(overridesPath))) {
                     overrides.load(in);
                     for (String name : overrides.stringPropertyNames()) {
                         componentServiceConfigs.put(name, overrides.getProperty(name));

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/HDFSURLCreatorBase.java
----------------------------------------------------------------------
diff --git a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/HDFSURLCreatorBase.java b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/HDFSURLCreatorBase.java
index 6145632..c6f7bb0 100644
--- a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/HDFSURLCreatorBase.java
+++ b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/HDFSURLCreatorBase.java
@@ -44,7 +44,7 @@ public abstract class HDFSURLCreatorBase implements ServiceURLCreator {
 
   protected AmbariServiceDiscoveryMessages log = MessagesFactory.get(AmbariServiceDiscoveryMessages.class);
 
-  private AmbariCluster cluster = null;
+  private AmbariCluster cluster;
 
 
   @Override

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/NameNodeUrlCreator.java
----------------------------------------------------------------------
diff --git a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/NameNodeUrlCreator.java b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/NameNodeUrlCreator.java
index 17a7517..7d39204 100644
--- a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/NameNodeUrlCreator.java
+++ b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/NameNodeUrlCreator.java
@@ -31,7 +31,7 @@ public class NameNodeUrlCreator implements ServiceURLCreator {
 
   private AmbariServiceDiscoveryMessages log = MessagesFactory.get(AmbariServiceDiscoveryMessages.class);
 
-  private AmbariCluster cluster = null;
+  private AmbariCluster cluster;
 
   @Override
   public void init(AmbariCluster cluster) {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/NiFiURLCreator.java
----------------------------------------------------------------------
diff --git a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/NiFiURLCreator.java b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/NiFiURLCreator.java
index ffe2922..a2d0dae 100644
--- a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/NiFiURLCreator.java
+++ b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/NiFiURLCreator.java
@@ -36,7 +36,7 @@ public class NiFiURLCreator implements ServiceURLCreator {
   static final String SSL_PORT_PROPERTY = "nifi.node.ssl.port";
 
 
-  private AmbariCluster cluster = null;
+  private AmbariCluster cluster;
 
   @Override
   public String getTargetService() {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/ResourceManagerURLCreatorBase.java
----------------------------------------------------------------------
diff --git a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/ResourceManagerURLCreatorBase.java b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/ResourceManagerURLCreatorBase.java
index 7081b30..a504d8a 100644
--- a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/ResourceManagerURLCreatorBase.java
+++ b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/ResourceManagerURLCreatorBase.java
@@ -35,7 +35,7 @@ public abstract class ResourceManagerURLCreatorBase implements ServiceURLCreator
 
   protected AmbariServiceDiscoveryMessages log = MessagesFactory.get(AmbariServiceDiscoveryMessages.class);
 
-  private AmbariCluster cluster = null;
+  private AmbariCluster cluster;
 
 
   @Override

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/ServiceURLPropertyConfig.java
----------------------------------------------------------------------
diff --git a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/ServiceURLPropertyConfig.java b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/ServiceURLPropertyConfig.java
index 25eedc6..ae2db81 100644
--- a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/ServiceURLPropertyConfig.java
+++ b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/ServiceURLPropertyConfig.java
@@ -30,9 +30,9 @@ import javax.xml.xpath.XPathExpression;
 import javax.xml.xpath.XPathExpressionException;
 import javax.xml.xpath.XPathFactory;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -87,7 +87,7 @@ class ServiceURLPropertyConfig {
      * The default service URL pattern to property mapping configuration will be used.
      */
     ServiceURLPropertyConfig(File mappingConfigurationFile) throws Exception {
-        this(new FileInputStream(mappingConfigurationFile));
+        this(Files.newInputStream(mappingConfigurationFile.toPath()));
     }
 
     /**

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/SparkCommonServiceURLCreator.java
----------------------------------------------------------------------
diff --git a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/SparkCommonServiceURLCreator.java b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/SparkCommonServiceURLCreator.java
index 6ff1614..ab49b45 100644
--- a/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/SparkCommonServiceURLCreator.java
+++ b/gateway-discovery-ambari/src/main/java/org/apache/knox/gateway/topology/discovery/ambari/SparkCommonServiceURLCreator.java
@@ -28,13 +28,13 @@ public abstract class SparkCommonServiceURLCreator implements ServiceURLCreator
 
   private static final String URL_TEMPLATE = "%s://%s:%s";
 
-  protected AmbariCluster cluster = null;
+  protected AmbariCluster cluster;
 
-  String primaryComponentName = null;
+  String primaryComponentName;
 
-  String secondaryComponentName = null;
+  String secondaryComponentName;
 
-  String portConfigProperty = null;
+  String portConfigProperty;
 
   @Override
   public void init(AmbariCluster cluster) {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-discovery-ambari/src/test/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariConfigurationMonitorTest.java
----------------------------------------------------------------------
diff --git a/gateway-discovery-ambari/src/test/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariConfigurationMonitorTest.java b/gateway-discovery-ambari/src/test/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariConfigurationMonitorTest.java
index fcdbcad..ee01e64 100644
--- a/gateway-discovery-ambari/src/test/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariConfigurationMonitorTest.java
+++ b/gateway-discovery-ambari/src/test/java/org/apache/knox/gateway/topology/discovery/ambari/AmbariConfigurationMonitorTest.java
@@ -40,7 +40,7 @@ import static org.junit.Assert.assertTrue;
 
 public class AmbariConfigurationMonitorTest {
 
-    private File dataDir = null;
+    private File dataDir;
 
     @Before
     public void setup() throws Exception {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-i18n/src/main/java/org/apache/knox/gateway/i18n/resources/ResourcesInvoker.java
----------------------------------------------------------------------
diff --git a/gateway-i18n/src/main/java/org/apache/knox/gateway/i18n/resources/ResourcesInvoker.java b/gateway-i18n/src/main/java/org/apache/knox/gateway/i18n/resources/ResourcesInvoker.java
index 77bf113..02000c0 100644
--- a/gateway-i18n/src/main/java/org/apache/knox/gateway/i18n/resources/ResourcesInvoker.java
+++ b/gateway-i18n/src/main/java/org/apache/knox/gateway/i18n/resources/ResourcesInvoker.java
@@ -108,14 +108,14 @@ public class ResourcesInvoker implements InvocationHandler {
 
   private static String createDefaultPatternSuffix( final int size ) {
     StringBuilder builder = new StringBuilder( 1 + size*7 );
-    builder.append( "(" );
+    builder.append('(');
     for( int i=0; i<size; i++ ) {
-      if( i>0 ) {
-        builder.append( "," );
+      if(i > 0) {
+        builder.append(',');
       }
-      builder.append( "\"{" ).append( i ).append( "}\"" );
+      builder.append("\"{").append(i).append("}\"");
     }
-    builder.append( ")" );
+    builder.append(')');
     return builder.toString();
 
   }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-ha/src/main/java/org/apache/knox/gateway/ha/provider/impl/AtlasZookeeperURLManager.java
----------------------------------------------------------------------
diff --git a/gateway-provider-ha/src/main/java/org/apache/knox/gateway/ha/provider/impl/AtlasZookeeperURLManager.java b/gateway-provider-ha/src/main/java/org/apache/knox/gateway/ha/provider/impl/AtlasZookeeperURLManager.java
index 8bca9e4..47a8641 100644
--- a/gateway-provider-ha/src/main/java/org/apache/knox/gateway/ha/provider/impl/AtlasZookeeperURLManager.java
+++ b/gateway-provider-ha/src/main/java/org/apache/knox/gateway/ha/provider/impl/AtlasZookeeperURLManager.java
@@ -32,16 +32,13 @@ import java.util.concurrent.TimeUnit;
 
 public class AtlasZookeeperURLManager extends DefaultURLManager {
     private static final String DEFAULT_ZOOKEEPER_NAMESPACE = "/apache_atlas";
-
     private static final String APACHE_ATLAS_ACTIVE_SERVER_INFO = "/active_server_info";
 
     private static final HaMessages LOG = MessagesFactory.get(HaMessages.class);
 
     private String zooKeeperEnsemble;
-
     private String zooKeeperNamespace;
 
-
     @Override
     public boolean supportsConfig(HaServiceConfig config) {
         if (!( config.getServiceName().equalsIgnoreCase("ATLAS") || config.getServiceName().equalsIgnoreCase("ATLAS-API"))) {
@@ -66,7 +63,6 @@ public class AtlasZookeeperURLManager extends DefaultURLManager {
     }
 
     public List<String> lookupURLs() {
-
         List<String> serverHosts = new ArrayList<>();
         try (CuratorFramework zooKeeperClient = CuratorFrameworkFactory.builder()
             .connectString(zooKeeperEnsemble)
@@ -88,8 +84,6 @@ public class AtlasZookeeperURLManager extends DefaultURLManager {
         return serverHosts;
     }
 
-
-
     @Override
     public synchronized void markFailed(String url) {
         setURLs(lookupURLs());

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-ha/src/main/java/org/apache/knox/gateway/ha/provider/impl/KafkaZookeeperURLManager.java
----------------------------------------------------------------------
diff --git a/gateway-provider-ha/src/main/java/org/apache/knox/gateway/ha/provider/impl/KafkaZookeeperURLManager.java b/gateway-provider-ha/src/main/java/org/apache/knox/gateway/ha/provider/impl/KafkaZookeeperURLManager.java
index a94834b..debbebe 100644
--- a/gateway-provider-ha/src/main/java/org/apache/knox/gateway/ha/provider/impl/KafkaZookeeperURLManager.java
+++ b/gateway-provider-ha/src/main/java/org/apache/knox/gateway/ha/provider/impl/KafkaZookeeperURLManager.java
@@ -133,15 +133,11 @@ public class KafkaZookeeperURLManager extends BaseZookeeperURLManager {
 
     StringBuilder buffer = new StringBuilder();
 
-    buffer.append(scheme);
-    buffer.append("://");
+    buffer.append(scheme).append("://");
 
     JSONParser parser = new JSONParser(JSONParser.DEFAULT_PERMISSIVE_MODE);
     JSONObject obj = (JSONObject) parser.parse(serverInfo);
-    buffer.append(obj.get("host"));
-
-    buffer.append(":");
-    buffer.append(PORT_NUMBER);
+    buffer.append(obj.get("host")).append(':').append(PORT_NUMBER);
 
     return buffer.toString();
   }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-identity-assertion-common/src/main/java/org/apache/knox/gateway/identityasserter/common/filter/IdentityAsserterHttpServletRequestWrapper.java
----------------------------------------------------------------------
diff --git a/gateway-provider-identity-assertion-common/src/main/java/org/apache/knox/gateway/identityasserter/common/filter/IdentityAsserterHttpServletRequestWrapper.java b/gateway-provider-identity-assertion-common/src/main/java/org/apache/knox/gateway/identityasserter/common/filter/IdentityAsserterHttpServletRequestWrapper.java
index 71251ca..1c8b478 100644
--- a/gateway-provider-identity-assertion-common/src/main/java/org/apache/knox/gateway/identityasserter/common/filter/IdentityAsserterHttpServletRequestWrapper.java
+++ b/gateway-provider-identity-assertion-common/src/main/java/org/apache/knox/gateway/identityasserter/common/filter/IdentityAsserterHttpServletRequestWrapper.java
@@ -266,12 +266,12 @@ private static SpiGatewayMessages log = MessagesFactory.get( SpiGatewayMessages.
         } else {
           for (String value : values) {
             if (sb.length() > 0) {
-              sb.append("&");
+              sb.append('&');
             }
             try {
               sb.append(urlEncode(name, encoding));
               if (value != null) {
-                sb.append("=");
+                sb.append('=');
                 sb.append(urlEncode(value, encoding));
               }
             } catch (IllegalArgumentException e) {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-identity-assertion-common/src/test/java/org/apache/knox/gateway/identityasserter/filter/CommonIdentityAssertionFilterTest.java
----------------------------------------------------------------------
diff --git a/gateway-provider-identity-assertion-common/src/test/java/org/apache/knox/gateway/identityasserter/filter/CommonIdentityAssertionFilterTest.java b/gateway-provider-identity-assertion-common/src/test/java/org/apache/knox/gateway/identityasserter/filter/CommonIdentityAssertionFilterTest.java
index 25800f5..ccc7936 100644
--- a/gateway-provider-identity-assertion-common/src/test/java/org/apache/knox/gateway/identityasserter/filter/CommonIdentityAssertionFilterTest.java
+++ b/gateway-provider-identity-assertion-common/src/test/java/org/apache/knox/gateway/identityasserter/filter/CommonIdentityAssertionFilterTest.java
@@ -48,9 +48,9 @@ import static org.junit.Assert.assertTrue;
  */
 public class CommonIdentityAssertionFilterTest {
 
-  private String username = null;
-  private String[] mappedGroups = null;
-  private Filter filter = null;
+  private String username;
+  private String[] mappedGroups;
+  private Filter filter;
 
   @Before
   public void setup() {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-identity-assertion-concat/src/main/java/org/apache/knox/gateway/identityasserter/concat/filter/ConcatIdentityAssertionFilter.java
----------------------------------------------------------------------
diff --git a/gateway-provider-identity-assertion-concat/src/main/java/org/apache/knox/gateway/identityasserter/concat/filter/ConcatIdentityAssertionFilter.java b/gateway-provider-identity-assertion-concat/src/main/java/org/apache/knox/gateway/identityasserter/concat/filter/ConcatIdentityAssertionFilter.java
index 7d72c97..655fec7 100644
--- a/gateway-provider-identity-assertion-concat/src/main/java/org/apache/knox/gateway/identityasserter/concat/filter/ConcatIdentityAssertionFilter.java
+++ b/gateway-provider-identity-assertion-concat/src/main/java/org/apache/knox/gateway/identityasserter/concat/filter/ConcatIdentityAssertionFilter.java
@@ -23,8 +23,8 @@ import javax.servlet.ServletException;
 import org.apache.knox.gateway.identityasserter.common.filter.CommonIdentityAssertionFilter;
 
 public class ConcatIdentityAssertionFilter extends CommonIdentityAssertionFilter {
-  private String prefix = null;
-  private String suffix = null;
+  private String prefix;
+  private String suffix;
 
   @Override
   public void init(FilterConfig filterConfig) throws ServletException {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-identity-assertion-regex/src/main/java/org/apache/knox/gateway/identityasserter/regex/filter/RegexIdentityAssertionFilter.java
----------------------------------------------------------------------
diff --git a/gateway-provider-identity-assertion-regex/src/main/java/org/apache/knox/gateway/identityasserter/regex/filter/RegexIdentityAssertionFilter.java b/gateway-provider-identity-assertion-regex/src/main/java/org/apache/knox/gateway/identityasserter/regex/filter/RegexIdentityAssertionFilter.java
index cb8c222..3ddc41a 100644
--- a/gateway-provider-identity-assertion-regex/src/main/java/org/apache/knox/gateway/identityasserter/regex/filter/RegexIdentityAssertionFilter.java
+++ b/gateway-provider-identity-assertion-regex/src/main/java/org/apache/knox/gateway/identityasserter/regex/filter/RegexIdentityAssertionFilter.java
@@ -31,8 +31,8 @@ import java.util.TreeMap;
 public class RegexIdentityAssertionFilter extends
     CommonIdentityAssertionFilter {
 
-  private String input = null;
-  private String output = null;
+  private String input;
+  private String output;
   private Map<String,String> dict;
   RegexTemplate template;
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-rewrite-func-hostmap-static/src/main/java/org/apache/knox/gateway/hostmap/impl/HostmapFunctionProcessor.java
----------------------------------------------------------------------
diff --git a/gateway-provider-rewrite-func-hostmap-static/src/main/java/org/apache/knox/gateway/hostmap/impl/HostmapFunctionProcessor.java b/gateway-provider-rewrite-func-hostmap-static/src/main/java/org/apache/knox/gateway/hostmap/impl/HostmapFunctionProcessor.java
index fe97b57..885eecc 100644
--- a/gateway-provider-rewrite-func-hostmap-static/src/main/java/org/apache/knox/gateway/hostmap/impl/HostmapFunctionProcessor.java
+++ b/gateway-provider-rewrite-func-hostmap-static/src/main/java/org/apache/knox/gateway/hostmap/impl/HostmapFunctionProcessor.java
@@ -37,7 +37,7 @@ public class HostmapFunctionProcessor
   public static final String DESCRIPTOR_DEFAULT_LOCATION = "/WEB-INF/" + DESCRIPTOR_DEFAULT_FILE_NAME;
 
   private HostMapperService hostMapperService;
-  private HostMapper hostMapper = null;
+  private HostMapper hostMapper;
   private String clusterName;
 
   @Override

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-rewrite-func-service-registry/src/main/java/org/apache/knox/gateway/svcregfunc/impl/ServiceMappedAddressFunctionProcessor.java
----------------------------------------------------------------------
diff --git a/gateway-provider-rewrite-func-service-registry/src/main/java/org/apache/knox/gateway/svcregfunc/impl/ServiceMappedAddressFunctionProcessor.java b/gateway-provider-rewrite-func-service-registry/src/main/java/org/apache/knox/gateway/svcregfunc/impl/ServiceMappedAddressFunctionProcessor.java
index e798301..7dcf063 100644
--- a/gateway-provider-rewrite-func-service-registry/src/main/java/org/apache/knox/gateway/svcregfunc/impl/ServiceMappedAddressFunctionProcessor.java
+++ b/gateway-provider-rewrite-func-service-registry/src/main/java/org/apache/knox/gateway/svcregfunc/impl/ServiceMappedAddressFunctionProcessor.java
@@ -37,7 +37,7 @@ public class ServiceMappedAddressFunctionProcessor
     extends ServiceRegistryFunctionProcessorBase<ServiceMappedAddressFunctionDescriptor>
     implements UrlRewriteFunctionProcessor<ServiceMappedAddressFunctionDescriptor> {
 
-  private HostMapper hostmap = null;
+  private HostMapper hostmap;
 
   @Override
   public String name() {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-rewrite-step-secure-query/src/main/java/org/apache/knox/gateway/securequery/SecureQueryDecryptProcessor.java
----------------------------------------------------------------------
diff --git a/gateway-provider-rewrite-step-secure-query/src/main/java/org/apache/knox/gateway/securequery/SecureQueryDecryptProcessor.java b/gateway-provider-rewrite-step-secure-query/src/main/java/org/apache/knox/gateway/securequery/SecureQueryDecryptProcessor.java
index df9e33e..ccd82c4 100644
--- a/gateway-provider-rewrite-step-secure-query/src/main/java/org/apache/knox/gateway/securequery/SecureQueryDecryptProcessor.java
+++ b/gateway-provider-rewrite-step-secure-query/src/main/java/org/apache/knox/gateway/securequery/SecureQueryDecryptProcessor.java
@@ -41,7 +41,7 @@ public class SecureQueryDecryptProcessor implements
   private static SecureQueryMessages log = MessagesFactory.get( SecureQueryMessages.class );
   private static final String ENCRYPTED_PARAMETER_NAME = "_";
 
-  private ConfigurableEncryptor encryptor = null;
+  private ConfigurableEncryptor encryptor;
 
   @Override
   public String getType() {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/UrlRewriteRequest.java
----------------------------------------------------------------------
diff --git a/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/UrlRewriteRequest.java b/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/UrlRewriteRequest.java
index a369830..a2ad19f 100644
--- a/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/UrlRewriteRequest.java
+++ b/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/UrlRewriteRequest.java
@@ -92,17 +92,13 @@ public class UrlRewriteRequest extends GatewayRequestWrapper implements Resolver
     //KNOX-439[
     //StringBuffer urlString = super.getRequestURL();
     StringBuilder urlString = new StringBuilder( 128 );
-    urlString.append( getScheme() );
-    urlString.append( "://" );
-    urlString.append( getServerName() );
-    urlString.append( ":" );
-    urlString.append( getServerPort() );
-    urlString.append( super.getRequestURI() );
+    urlString.append(getScheme()).append("://")
+        .append(getServerName()).append(':').append(getServerPort())
+        .append(super.getRequestURI());
     //]
     String queryString = super.getQueryString();
     if( queryString != null ) {
-      urlString.append( '?' );
-      urlString.append( queryString );
+      urlString.append( '?' ).append( queryString );
     }
     try {
       urlTemplate = Parser.parseLiteral( urlString.toString() );

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/UrlRewriteResponse.java
----------------------------------------------------------------------
diff --git a/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/UrlRewriteResponse.java b/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/UrlRewriteResponse.java
index 783e9d5..1efcb40 100644
--- a/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/UrlRewriteResponse.java
+++ b/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/UrlRewriteResponse.java
@@ -18,6 +18,7 @@
 package org.apache.knox.gateway.filter.rewrite.impl;
 
 import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
+import org.apache.commons.lang3.StringUtils;
 import org.apache.knox.gateway.filter.GatewayResponseWrapper;
 import org.apache.knox.gateway.filter.ResponseStreamer;
 import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteFilterContentDescriptor;
@@ -153,7 +154,7 @@ public class UrlRewriteResponse extends GatewayResponseWrapper implements Params
         getRewriteFilterConfig(rewriter.getConfig(), bodyFilterName, mimeType);
     if (filterContentConfig != null) {
       String asType = filterContentConfig.asType();
-      if ( asType != null && !asType.trim().isEmpty()) {
+      if ( asType != null && !StringUtils.isBlank(asType)) {
         mimeType = MimeTypes.create(asType, getCharacterEncoding());
       }
     }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/html/HtmlFilterReaderBase.java
----------------------------------------------------------------------
diff --git a/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/html/HtmlFilterReaderBase.java b/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/html/HtmlFilterReaderBase.java
index c2b4264..60005fe 100644
--- a/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/html/HtmlFilterReaderBase.java
+++ b/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/html/HtmlFilterReaderBase.java
@@ -65,7 +65,7 @@ public abstract class HtmlFilterReaderBase extends Reader implements
   private int offset;
   private StringWriter writer;
   private StringBuffer buffer;
-  private UrlRewriteFilterContentDescriptor config = null;
+  private UrlRewriteFilterContentDescriptor config;
 
   protected HtmlFilterReaderBase( Reader reader ) throws IOException, ParserConfigurationException {
     this.reader = reader;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/html/HtmlImportFunctionProcessor.java
----------------------------------------------------------------------
diff --git a/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/html/HtmlImportFunctionProcessor.java b/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/html/HtmlImportFunctionProcessor.java
index 5687a40f..f3e7bb1 100644
--- a/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/html/HtmlImportFunctionProcessor.java
+++ b/gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/impl/html/HtmlImportFunctionProcessor.java
@@ -80,8 +80,7 @@ public class HtmlImportFunctionProcessor implements UrlRewriteFunctionProcessor<
     }
     List<String> frontendValues = frontend.resolve(context, parameters);
     StringBuilder buffer = new StringBuilder(IMPORT_LITERAL);
-    buffer.append(" ");
-    buffer.append(prefix);
+    buffer.append(' ').append(prefix);
     if ( frontendValues != null && !frontendValues.isEmpty() ) {
       for ( String value : frontendValues ) {
         buffer.append(value);

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-authz-acls/src/main/java/org/apache/knox/gateway/filter/AclsAuthorizationFilter.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-authz-acls/src/main/java/org/apache/knox/gateway/filter/AclsAuthorizationFilter.java b/gateway-provider-security-authz-acls/src/main/java/org/apache/knox/gateway/filter/AclsAuthorizationFilter.java
index 29dc38b..d0d1629 100644
--- a/gateway-provider-security-authz-acls/src/main/java/org/apache/knox/gateway/filter/AclsAuthorizationFilter.java
+++ b/gateway-provider-security-authz-acls/src/main/java/org/apache/knox/gateway/filter/AclsAuthorizationFilter.java
@@ -50,8 +50,8 @@ public class AclsAuthorizationFilter implements Filter {
   private static Auditor auditor = AuditServiceFactory.getAuditService().getAuditor( AuditConstants.DEFAULT_AUDITOR_NAME,
           AuditConstants.KNOX_SERVICE_NAME, AuditConstants.KNOX_COMPONENT_NAME );
 
-  private String resourceRole = null;
-  private String aclProcessingMode = null;
+  private String resourceRole;
+  private String aclProcessingMode;
   private AclParser parser = new AclParser();
   private ArrayList<String> adminGroups = new ArrayList<>();
   private ArrayList<String> adminUsers = new ArrayList<>();

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-authz-acls/src/test/java/org/apache/knox/gateway/filter/AclsAuthzFilterTest.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-authz-acls/src/test/java/org/apache/knox/gateway/filter/AclsAuthzFilterTest.java b/gateway-provider-security-authz-acls/src/test/java/org/apache/knox/gateway/filter/AclsAuthzFilterTest.java
index 4d1258a..43c9bec 100644
--- a/gateway-provider-security-authz-acls/src/test/java/org/apache/knox/gateway/filter/AclsAuthzFilterTest.java
+++ b/gateway-provider-security-authz-acls/src/test/java/org/apache/knox/gateway/filter/AclsAuthzFilterTest.java
@@ -42,8 +42,8 @@ import org.junit.Before;
 import org.junit.Test;
 
 public class AclsAuthzFilterTest {
-  private boolean accessGranted = false;
-  private Filter filter = null;
+  private boolean accessGranted;
+  private Filter filter;
 
   @Before
   public void setup() {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/AbstractJWTFilter.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/AbstractJWTFilter.java b/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/AbstractJWTFilter.java
index 2ad4c1b..418e38e 100644
--- a/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/AbstractJWTFilter.java
+++ b/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/AbstractJWTFilter.java
@@ -83,7 +83,7 @@ public abstract class AbstractJWTFilter implements Filter {
 
   protected List<String> audiences;
   protected JWTokenAuthority authority;
-  protected RSAPublicKey publicKey = null;
+  protected RSAPublicKey publicKey;
   private String expectedIssuer;
   private String expectedSigAlg;
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/JWTAccessTokenAssertionFilter.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/JWTAccessTokenAssertionFilter.java b/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/JWTAccessTokenAssertionFilter.java
index c4de8ab..ac14794 100644
--- a/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/JWTAccessTokenAssertionFilter.java
+++ b/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/JWTAccessTokenAssertionFilter.java
@@ -51,7 +51,7 @@ public class JWTAccessTokenAssertionFilter extends AbstractIdentityAssertionFilt
   private static final String BEARER = "Bearer ";
   private static JWTMessages log = MessagesFactory.get( JWTMessages.class );
   private long validity;
-  private JWTokenAuthority authority = null;
+  private JWTokenAuthority authority;
   private ServiceRegistry sr;
 
   @Override

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/JWTAuthCodeAssertionFilter.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/JWTAuthCodeAssertionFilter.java b/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/JWTAuthCodeAssertionFilter.java
index d7f0dcf..0602928 100644
--- a/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/JWTAuthCodeAssertionFilter.java
+++ b/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/JWTAuthCodeAssertionFilter.java
@@ -39,7 +39,7 @@ import org.apache.knox.gateway.util.JsonUtils;
 public class JWTAuthCodeAssertionFilter extends AbstractIdentityAssertionFilter {
   private static final String BEARER = "Bearer ";
 
-  private JWTokenAuthority authority = null;
+  private JWTokenAuthority authority;
 
   private ServiceRegistry sr;
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/SSOCookieFederationFilter.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/SSOCookieFederationFilter.java b/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/SSOCookieFederationFilter.java
index bf6ad94..d5235aa 100644
--- a/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/SSOCookieFederationFilter.java
+++ b/gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/SSOCookieFederationFilter.java
@@ -213,9 +213,9 @@ private String gatewayPath;
     StringBuilder sb = new StringBuilder(scheme);
     sb.append("://").append(host);
     if (!host.contains(":")) {
-      sb.append(":").append(port);
+      sb.append(':').append(port);
     }
-    sb.append("/").append(gatewayPath).append("/knoxsso/api/v1/websso");
+    sb.append('/').append(gatewayPath).append("/knoxsso/api/v1/websso");
 
     return sb.toString();
   }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-jwt/src/test/java/org/apache/knox/gateway/provider/federation/AbstractJWTFilterTest.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-jwt/src/test/java/org/apache/knox/gateway/provider/federation/AbstractJWTFilterTest.java b/gateway-provider-security-jwt/src/test/java/org/apache/knox/gateway/provider/federation/AbstractJWTFilterTest.java
index 9712ca8..dd9aae9 100644
--- a/gateway-provider-security-jwt/src/test/java/org/apache/knox/gateway/provider/federation/AbstractJWTFilterTest.java
+++ b/gateway-provider-security-jwt/src/test/java/org/apache/knox/gateway/provider/federation/AbstractJWTFilterTest.java
@@ -72,10 +72,10 @@ public abstract class AbstractJWTFilterTest  {
   private static final String SERVICE_URL = "https://localhost:8888/resource";
   private static final String dnTemplate = "CN={0},OU=Test,O=Hadoop,L=Test,ST=Test,C=US";
 
-  protected AbstractJWTFilter handler = null;
-  protected static RSAPublicKey publicKey = null;
-  protected static RSAPrivateKey privateKey = null;
-  protected static String pem = null;
+  protected AbstractJWTFilter handler;
+  protected static RSAPublicKey publicKey;
+  protected static RSAPrivateKey privateKey;
+  protected static String pem;
 
   protected abstract void setTokenOnRequest(HttpServletRequest request, SignedJWT jwt);
   protected abstract void setGarbledTokenOnRequest(HttpServletRequest request, SignedJWT jwt);
@@ -819,8 +819,8 @@ public abstract class AbstractJWTFilterTest  {
   }
 
   protected static class TestFilterChain implements FilterChain {
-    boolean doFilterCalled = false;
-    Subject subject = null;
+    boolean doFilterCalled;
+    Subject subject;
 
     @Override
     public void doFilter(ServletRequest request, ServletResponse response) {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-pac4j/src/main/java/org/apache/knox/gateway/pac4j/filter/Pac4jDispatcherFilter.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-pac4j/src/main/java/org/apache/knox/gateway/pac4j/filter/Pac4jDispatcherFilter.java b/gateway-provider-security-pac4j/src/main/java/org/apache/knox/gateway/pac4j/filter/Pac4jDispatcherFilter.java
index 78c2449..02e1064 100644
--- a/gateway-provider-security-pac4j/src/main/java/org/apache/knox/gateway/pac4j/filter/Pac4jDispatcherFilter.java
+++ b/gateway-provider-security-pac4j/src/main/java/org/apache/knox/gateway/pac4j/filter/Pac4jDispatcherFilter.java
@@ -85,9 +85,9 @@ public class Pac4jDispatcherFilter implements Filter {
   private CallbackFilter callbackFilter;
 
   private SecurityFilter securityFilter;
-  private MasterService masterService = null;
-  private KeystoreService keystoreService = null;
-  private AliasService aliasService = null;
+  private MasterService masterService;
+  private KeystoreService keystoreService;
+  private AliasService aliasService;
 
   @Override
   public void init( FilterConfig filterConfig ) throws ServletException {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-pac4j/src/test/java/org/apache/knox/gateway/pac4j/MockHttpServletResponse.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-pac4j/src/test/java/org/apache/knox/gateway/pac4j/MockHttpServletResponse.java b/gateway-provider-security-pac4j/src/test/java/org/apache/knox/gateway/pac4j/MockHttpServletResponse.java
index 8d0643d..6608e28 100644
--- a/gateway-provider-security-pac4j/src/test/java/org/apache/knox/gateway/pac4j/MockHttpServletResponse.java
+++ b/gateway-provider-security-pac4j/src/test/java/org/apache/knox/gateway/pac4j/MockHttpServletResponse.java
@@ -33,7 +33,7 @@ public class MockHttpServletResponse extends HttpServletResponseWrapper {
 
     private List<Cookie> cookies = new ArrayList<>();
     private String location;
-    private int status = 0;
+    private int status;
     private Map<String, String> headers = new HashMap<>();
 
     public MockHttpServletResponse() {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/AbstractPreAuthFederationFilter.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/AbstractPreAuthFederationFilter.java b/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/AbstractPreAuthFederationFilter.java
index c6d1389..0b74c5e 100644
--- a/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/AbstractPreAuthFederationFilter.java
+++ b/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/AbstractPreAuthFederationFilter.java
@@ -46,7 +46,7 @@ import org.apache.knox.gateway.security.PrimaryPrincipal;
 
 public abstract class AbstractPreAuthFederationFilter implements Filter {
 
-  private List<PreAuthValidator> validators = null;
+  private List<PreAuthValidator> validators;
   private FilterConfig filterConfig;
   private static AuditService auditService = AuditServiceFactory.getAuditService();
   private static Auditor auditor = auditService.getAuditor(

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/HeaderPreAuthFederationFilter.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/HeaderPreAuthFederationFilter.java b/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/HeaderPreAuthFederationFilter.java
index 2cd6235..bf613c2 100644
--- a/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/HeaderPreAuthFederationFilter.java
+++ b/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/HeaderPreAuthFederationFilter.java
@@ -30,7 +30,7 @@ public class HeaderPreAuthFederationFilter extends AbstractPreAuthFederationFilt
   static final String CUSTOM_HEADER_PARAM = "preauth.custom.header";
   static final String CUSTOM_GROUP_HEADER_PARAM = "preauth.custom.group.header";
   String headerName = "SM_USER";
-  String groupHeaderName = null;
+  String groupHeaderName;
 
   @Override
   public void init(FilterConfig filterConfig) throws ServletException {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/PreAuthFederationFilter.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/PreAuthFederationFilter.java b/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/PreAuthFederationFilter.java
index d056b84..020004d 100644
--- a/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/PreAuthFederationFilter.java
+++ b/gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/PreAuthFederationFilter.java
@@ -31,7 +31,7 @@ import javax.servlet.http.HttpServletResponse;
 
 public class PreAuthFederationFilter implements Filter {
   private static final String CUSTOM_HEADER_PARAM = "preauth.customHeader";
-  private List<PreAuthValidator> validators = null;
+  private List<PreAuthValidator> validators;
   private FilterConfig filterConfig;
   private String headerName = "SM_USER";
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/deploy/impl/ShiroConfig.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/deploy/impl/ShiroConfig.java b/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/deploy/impl/ShiroConfig.java
index f282d06..60ac744 100644
--- a/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/deploy/impl/ShiroConfig.java
+++ b/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/deploy/impl/ShiroConfig.java
@@ -62,9 +62,9 @@ public class ShiroConfig {
   public String toString() {
     StringBuilder sb = new StringBuilder();
     for(Entry<String, Map<String, String>> section : sections.entrySet()) {
-      sb.append("[").append(section.getKey()).append("]\n");
+      sb.append('[').append(section.getKey()).append("]\n");
       for(Entry<String, String> entry : section.getValue().entrySet()) {
-        sb.append(entry.getKey()).append("=").append(entry.getValue()).append("\n");
+        sb.append(entry.getKey()).append('=').append(entry.getValue()).append('\n');
       }
     }
     return sb.toString();

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/filter/RedirectToUrlFilter.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/filter/RedirectToUrlFilter.java b/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/filter/RedirectToUrlFilter.java
index 87f25f7..f97984f 100644
--- a/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/filter/RedirectToUrlFilter.java
+++ b/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/filter/RedirectToUrlFilter.java
@@ -28,7 +28,7 @@ import java.io.IOException;
 public class RedirectToUrlFilter extends AbstractGatewayFilter {
   public static final String REDIRECT_TO_URL = "redirectToUrl";
 
-  protected String redirectUrl = null;
+  protected String redirectUrl;
 
   @Override
   public void init(FilterConfig filterConfig) throws ServletException {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/shirorealm/KnoxLdapRealm.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/shirorealm/KnoxLdapRealm.java b/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/shirorealm/KnoxLdapRealm.java
index 1a33d57..7aedeca 100644
--- a/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/shirorealm/KnoxLdapRealm.java
+++ b/gateway-provider-security-shiro/src/main/java/org/apache/knox/gateway/shirorealm/KnoxLdapRealm.java
@@ -162,7 +162,7 @@ public class KnoxLdapRealm extends JndiLdapRealm {
     private String principalRegex = DEFAULT_PRINCIPAL_REGEX;
     private Pattern principalPattern = Pattern.compile( DEFAULT_PRINCIPAL_REGEX );
     private String userDnTemplate = "{0}";
-    private String userSearchFilter = null;
+    private String userSearchFilter;
     private String userSearchAttributeTemplate = "{0}";
     private String userSearchScope = "subtree";
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-webappsec/src/main/java/org/apache/knox/gateway/webappsec/filter/CSRFPreventionFilter.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-webappsec/src/main/java/org/apache/knox/gateway/webappsec/filter/CSRFPreventionFilter.java b/gateway-provider-security-webappsec/src/main/java/org/apache/knox/gateway/webappsec/filter/CSRFPreventionFilter.java
index 9d0ba44..a248d5b 100644
--- a/gateway-provider-security-webappsec/src/main/java/org/apache/knox/gateway/webappsec/filter/CSRFPreventionFilter.java
+++ b/gateway-provider-security-webappsec/src/main/java/org/apache/knox/gateway/webappsec/filter/CSRFPreventionFilter.java
@@ -36,7 +36,7 @@ public class CSRFPreventionFilter implements Filter {
   private static final String CUSTOM_METHODS_TO_IGNORE_PARAM = "csrf.methodstoignore";
   private String  headerName = "X-XSRF-Header";
   private String  mti = "GET,OPTIONS,HEAD";
-  private Set<String> methodsToIgnore = null;
+  private Set<String> methodsToIgnore;
 
   @Override
   public void init( FilterConfig filterConfig ) throws ServletException {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/StrictTransportFilterTest.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/StrictTransportFilterTest.java b/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/StrictTransportFilterTest.java
index a4a5730..c459a1a 100644
--- a/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/StrictTransportFilterTest.java
+++ b/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/StrictTransportFilterTest.java
@@ -39,9 +39,9 @@ import org.junit.Test;
 
 public class StrictTransportFilterTest {
   private static final String STRICT_TRANSPORT = "Strict-Transport-Security";
-  String options = null;
-  Collection<String> headerNames = null;
-  Collection<String> headers = null;
+  String options;
+  Collection<String> headerNames;
+  Collection<String> headers;
 
   @Test
   public void testDefaultOptionsValue() throws Exception {
@@ -129,7 +129,7 @@ public class StrictTransportFilterTest {
   }
 
   class TestFilterChain implements FilterChain {
-    boolean doFilterCalled = false;
+    boolean doFilterCalled;
 
     @Override
     public void doFilter(ServletRequest request, ServletResponse response)

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XContentTypeOptionsFilterTest.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XContentTypeOptionsFilterTest.java b/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XContentTypeOptionsFilterTest.java
index 9318d38..d08642e 100644
--- a/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XContentTypeOptionsFilterTest.java
+++ b/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XContentTypeOptionsFilterTest.java
@@ -38,8 +38,8 @@ import static org.junit.Assert.fail;
 
 public class XContentTypeOptionsFilterTest {
 
-  private String options = null;
-  private Collection<String> headers = null;
+  private String options;
+  private Collection<String> headers;
 
   @Test
   public void testDefaultOptionsValue() throws Exception {
@@ -126,7 +126,7 @@ public class XContentTypeOptionsFilterTest {
   }
 
   class TestFilterChain implements FilterChain {
-    boolean doFilterCalled = false;
+    boolean doFilterCalled;
 
     @Override
     public void doFilter(ServletRequest request, ServletResponse response) {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XFrameOptionsFilterTest.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XFrameOptionsFilterTest.java b/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XFrameOptionsFilterTest.java
index eb085d6..6ac0525 100644
--- a/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XFrameOptionsFilterTest.java
+++ b/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XFrameOptionsFilterTest.java
@@ -39,9 +39,9 @@ import org.junit.Test;
 
 public class XFrameOptionsFilterTest {
   private static final String X_FRAME_OPTIONS = "X-Frame-Options";
-  String options = null;
-  Collection<String> headerNames = null;
-  Collection<String> headers = null;
+  String options;
+  Collection<String> headerNames;
+  Collection<String> headers;
 
   @Test
   public void testDefaultOptionsValue() throws Exception {
@@ -158,7 +158,7 @@ public class XFrameOptionsFilterTest {
   }
 
   class TestFilterChain implements FilterChain {
-    boolean doFilterCalled = false;
+    boolean doFilterCalled;
 
     @Override
     public void doFilter(ServletRequest request, ServletResponse response)

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XSSProtectionFilterTest.java
----------------------------------------------------------------------
diff --git a/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XSSProtectionFilterTest.java b/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XSSProtectionFilterTest.java
index 8d0dbca..773384b 100644
--- a/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XSSProtectionFilterTest.java
+++ b/gateway-provider-security-webappsec/src/test/java/org/apache/knox/gateway/webappsec/XSSProtectionFilterTest.java
@@ -38,8 +38,8 @@ import static org.junit.Assert.fail;
 
 public class XSSProtectionFilterTest {
 
-  private String options = null;
-  private Collection<String> headers = null;
+  private String options;
+  private Collection<String> headers;
 
   @Test
   public void testDefaultOptionsValue() throws Exception {
@@ -122,7 +122,7 @@ public class XSSProtectionFilterTest {
   }
 
   class TestFilterChain implements FilterChain {
-    boolean doFilterCalled = false;
+    boolean doFilterCalled;
 
     @Override
     public void doFilter(ServletRequest request, ServletResponse response) throws IOException, ServletException {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server-xforwarded-filter/src/main/java/org/apache/knox/gateway/filter/CompositeEnumeration.java
----------------------------------------------------------------------
diff --git a/gateway-server-xforwarded-filter/src/main/java/org/apache/knox/gateway/filter/CompositeEnumeration.java b/gateway-server-xforwarded-filter/src/main/java/org/apache/knox/gateway/filter/CompositeEnumeration.java
index 3c60e0b..96a76c6 100644
--- a/gateway-server-xforwarded-filter/src/main/java/org/apache/knox/gateway/filter/CompositeEnumeration.java
+++ b/gateway-server-xforwarded-filter/src/main/java/org/apache/knox/gateway/filter/CompositeEnumeration.java
@@ -22,7 +22,7 @@ import java.util.NoSuchElementException;
 
 public class CompositeEnumeration<T> implements Enumeration<T> {
 
-  private int index = 0;
+  private int index;
   private Enumeration<T>[] array;
 
   @SafeVarargs

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/GatewayFilter.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/GatewayFilter.java b/gateway-server/src/main/java/org/apache/knox/gateway/GatewayFilter.java
index e93daee..6403a02 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/GatewayFilter.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/GatewayFilter.java
@@ -134,10 +134,9 @@ public class GatewayFilter implements Filter {
             match = chains.match(Parser.parseLiteral(newPathWithQuery));
             String origUrl = ((HttpServletRequest) servletRequest).getRequestURL().toString();
             String url = origUrl;
-            if (path.equals("/")) {
+            if (path == null || path.equals("/")) {
               url += defaultServicePath;
-            }
-            else {
+            } else {
               int index = origUrl.indexOf(path);
               url = origUrl.substring(0, index) + "/" + defaultServicePath + path;
             }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/GatewayForwardingServlet.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/GatewayForwardingServlet.java b/gateway-server/src/main/java/org/apache/knox/gateway/GatewayForwardingServlet.java
index 6f078bd..403c5fe 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/GatewayForwardingServlet.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/GatewayForwardingServlet.java
@@ -49,7 +49,7 @@ public class GatewayForwardingServlet extends HttpServlet{
           .getAuditor( AuditConstants.DEFAULT_AUDITOR_NAME,
                   AuditConstants.KNOX_SERVICE_NAME, AuditConstants.KNOX_COMPONENT_NAME );
 
-  private String redirectToContext = null;
+  private String redirectToContext;
 
   @Override
   protected void doHead(HttpServletRequest req, HttpServletResponse resp)

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/GatewayServer.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/GatewayServer.java b/gateway-server/src/main/java/org/apache/knox/gateway/GatewayServer.java
index 0a90220..2c80c81 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/GatewayServer.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/GatewayServer.java
@@ -81,7 +81,6 @@ import javax.servlet.SessionCookieConfig;
 import javax.xml.parsers.ParserConfigurationException;
 import javax.xml.transform.TransformerException;
 import java.io.File;
-import java.io.FileOutputStream;
 import java.io.FilenameFilter;
 import java.io.IOException;
 import java.io.InputStream;
@@ -96,6 +95,7 @@ import java.net.URISyntaxException;
 import java.net.URL;
 import java.net.URLClassLoader;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.security.KeyStoreException;
 import java.security.NoSuchAlgorithmException;
 import java.security.cert.CertificateException;
@@ -734,7 +734,7 @@ public class GatewayServer {
         }
       }
 
-      try (OutputStream outputStream = new FileOutputStream(webXmlFile);
+      try (OutputStream outputStream = Files.newOutputStream(webXmlFile.toPath());
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream, StandardCharsets.UTF_8)) {
         XmlUtils.writeXml(webXmlDoc, outputStreamWriter);
       }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/deploy/DeploymentFactory.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/deploy/DeploymentFactory.java b/gateway-server/src/main/java/org/apache/knox/gateway/deploy/DeploymentFactory.java
index 6358107..59f014f 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/deploy/DeploymentFactory.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/deploy/DeploymentFactory.java
@@ -69,7 +69,7 @@ public abstract class DeploymentFactory {
   private static final String SERVLET_NAME_SUFFIX = "-knox-gateway-servlet";
   private static final String FILTER_NAME_SUFFIX = "-knox-gateway-filter";
   private static final GatewayMessages log = MessagesFactory.get( GatewayMessages.class );
-  private static GatewayServices gatewayServices = null;
+  private static GatewayServices gatewayServices;
 
   private static Map<String,Map<String,Map<Version, ServiceDeploymentContributor>>> SERVICE_CONTRIBUTOR_MAP;
   static {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/deploy/impl/ApplicationDeploymentContributor.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/deploy/impl/ApplicationDeploymentContributor.java b/gateway-server/src/main/java/org/apache/knox/gateway/deploy/impl/ApplicationDeploymentContributor.java
index 8cbe8bc..00574af 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/deploy/impl/ApplicationDeploymentContributor.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/deploy/impl/ApplicationDeploymentContributor.java
@@ -41,13 +41,14 @@ import javax.xml.bind.JAXBContext;
 import javax.xml.bind.JAXBException;
 import javax.xml.bind.Unmarshaller;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.StringReader;
 import java.net.URISyntaxException;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -84,7 +85,7 @@ public class ApplicationDeploymentContributor extends ServiceDeploymentContribut
     } else {
       JAXBContext context = JAXBContext.newInstance( ServiceDefinition.class );
       Unmarshaller unmarshaller = context.createUnmarshaller();
-      try( FileInputStream inputStream = new FileInputStream( file ) ) {
+      try(InputStream inputStream = Files.newInputStream(file.toPath()) ) {
           definition = (ServiceDefinition) unmarshaller.unmarshal( inputStream );
       }
     }
@@ -96,9 +97,10 @@ public class ApplicationDeploymentContributor extends ServiceDeploymentContribut
     if( !file.exists() ) {
       rules = UrlRewriteRulesDescriptorFactory.load( "xml", new StringReader( "<rules/>" ) );
     } else {
-      InputStreamReader reader = new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8);
-      rules = UrlRewriteRulesDescriptorFactory.load( "xml", reader );
-      reader.close();
+      try(InputStream inputStream = Files.newInputStream(file.toPath());
+          InputStreamReader reader = new InputStreamReader(inputStream, StandardCharsets.UTF_8)) {
+        rules = UrlRewriteRulesDescriptorFactory.load("xml", reader);
+      }
     }
     return rules;
   }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/dispatch/UrlConnectionDispatch.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/dispatch/UrlConnectionDispatch.java b/gateway-server/src/main/java/org/apache/knox/gateway/dispatch/UrlConnectionDispatch.java
index 43fb579..27c83e5 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/dispatch/UrlConnectionDispatch.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/dispatch/UrlConnectionDispatch.java
@@ -113,16 +113,16 @@ public class UrlConnectionDispatch extends AbstractGatewayFilter {
     StringBuilder paramStr = new StringBuilder();
     Enumeration paramNames = request.getParameterNames();
     if( paramNames.hasMoreElements() ) {
-      paramStr.append( "?" );
+      paramStr.append('?');
     }
     while( paramNames.hasMoreElements() ) {
       String paramName = (String)paramNames.nextElement();
       String paramValue = request.getParameter( paramName );
       paramStr.append( paramName );
-      paramStr.append( "=" );
+      paramStr.append('=');
       paramStr.append( URLEncoder.encode( paramValue, StandardCharsets.UTF_8.name() ) );
       if( paramNames.hasMoreElements() ) {
-        paramStr.append( "&" );
+        paramStr.append('&');
       }
     }
     String urlStr = targetUri.toString() + paramStr.toString();

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/filter/PortMappingHelperHandler.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/filter/PortMappingHelperHandler.java b/gateway-server/src/main/java/org/apache/knox/gateway/filter/PortMappingHelperHandler.java
index a11f52a..effcd64 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/filter/PortMappingHelperHandler.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/filter/PortMappingHelperHandler.java
@@ -49,7 +49,7 @@ public class PortMappingHelperHandler extends HandlerWrapper {
 
   final GatewayConfig config;
 
-  private String defaultTopologyRedirectContext = null;
+  private String defaultTopologyRedirectContext;
 
   public PortMappingHelperHandler(final GatewayConfig config) {
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/services/CLIGatewayServices.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/CLIGatewayServices.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/CLIGatewayServices.java
index 919019d..5214928 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/CLIGatewayServices.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/CLIGatewayServices.java
@@ -43,8 +43,8 @@ public class CLIGatewayServices implements GatewayServices {
   private static GatewayMessages log = MessagesFactory.get( GatewayMessages.class );
 
   private Map<String,Service> services = new HashMap<>();
-  private CLIMasterService ms = null;
-  private DefaultKeystoreService ks = null;
+  private CLIMasterService ms;
+  private DefaultKeystoreService ks;
 
   public CLIGatewayServices() {
     super();

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/services/DefaultGatewayServices.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/DefaultGatewayServices.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/DefaultGatewayServices.java
index 98f13b2..a09f2f3 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/DefaultGatewayServices.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/DefaultGatewayServices.java
@@ -52,8 +52,8 @@ public class DefaultGatewayServices implements GatewayServices {
   private static GatewayMessages log = MessagesFactory.get( GatewayMessages.class );
 
   private Map<String,Service> services = new HashMap<>();
-  private DefaultMasterService ms = null;
-  private DefaultKeystoreService ks = null;
+  private DefaultMasterService ms;
+  private DefaultKeystoreService ks;
 
   public DefaultGatewayServices() {
     super();

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/services/metrics/impl/instr/InstrumentedGatewayFilter.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/metrics/impl/instr/InstrumentedGatewayFilter.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/metrics/impl/instr/InstrumentedGatewayFilter.java
index 9026598..e346bf8 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/metrics/impl/instr/InstrumentedGatewayFilter.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/metrics/impl/instr/InstrumentedGatewayFilter.java
@@ -85,12 +85,12 @@ public class InstrumentedGatewayFilter extends GatewayFilter {
 
   private Timer timer(ServletRequest request) {
     StringBuilder builder = new StringBuilder();
-    builder.append("client.");
-    builder.append(request.getServletContext().getContextPath());
+    builder.append("client.")
+        .append(request.getServletContext().getContextPath());
     if (request instanceof HttpServletRequest) {
       HttpServletRequest httpServletRequest = (HttpServletRequest) request;
       builder.append(InstrUtils.getResourcePath(httpServletRequest.getPathInfo()));
-      builder.append(".");
+      builder.append('.');
       builder.append(httpServletRequest.getMethod());
       builder.append("-requests");
     }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/services/metrics/impl/reporters/AbstractMetricsReporter.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/metrics/impl/reporters/AbstractMetricsReporter.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/metrics/impl/reporters/AbstractMetricsReporter.java
index 9ec3cb5..e23982d 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/metrics/impl/reporters/AbstractMetricsReporter.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/metrics/impl/reporters/AbstractMetricsReporter.java
@@ -20,7 +20,7 @@ package org.apache.knox.gateway.services.metrics.impl.reporters;
 import org.apache.knox.gateway.services.metrics.MetricsReporter;
 
 public abstract class AbstractMetricsReporter implements MetricsReporter {
-  private boolean enabled = false;
+  private boolean enabled;
 
   @Override
   public boolean isEnabled() {


[2/3] knox git commit: KNOX-1615 - Enable PMD for source analysis

Posted by kr...@apache.org.
http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultCryptoService.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultCryptoService.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultCryptoService.java
index 7010d29..24487a0 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultCryptoService.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultCryptoService.java
@@ -41,11 +41,11 @@ import org.apache.knox.gateway.services.ServiceLifecycleException;
 public class DefaultCryptoService implements CryptoService {
   private static final GatewayMessages LOG = MessagesFactory.get( GatewayMessages.class );
 
-  private AliasService as = null;
-  private KeystoreService ks = null;
+  private AliasService as;
+  private KeystoreService ks;
   private HashMap<String,ConfigurableEncryptor> encryptorCache =
       new HashMap<>();
-  private GatewayConfig config = null;
+  private GatewayConfig config;
 
   public void setKeystoreService(KeystoreService ks) {
     this.ks = ks;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultKeystoreService.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultKeystoreService.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultKeystoreService.java
index e72681f..c0c6756 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultKeystoreService.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultKeystoreService.java
@@ -62,11 +62,11 @@ public class DefaultKeystoreService extends BaseKeystoreService implements
   private static GatewayMessages LOG = MessagesFactory.get( GatewayMessages.class );
   private static GatewayResources RES = ResourcesFactory.get( GatewayResources.class );
 
-  private String signingKeystoreName = null;
-  private String signingKeyAlias = null;
+  private String signingKeystoreName;
+  private String signingKeyAlias;
   private Map<String, Map<String, String>> cache = new ConcurrentHashMap<>();
-  private Lock readLock = null;
-  private Lock writeLock = null;
+  private Lock readLock;
+  private Lock writeLock;
 
   @Override
   public void init(GatewayConfig config, Map<String, String> options)

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/JettySSLService.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/JettySSLService.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/JettySSLService.java
index 75613c3..b9e5c0c 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/JettySSLService.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/JettySSLService.java
@@ -17,9 +17,10 @@
  */
 package org.apache.knox.gateway.services.security.impl;
 
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
 import java.security.NoSuchAlgorithmException;
@@ -55,9 +56,9 @@ public class JettySSLService implements SSLService {
   private MasterService ms;
   private KeystoreService ks;
   private AliasService as;
-  private List<String> sslIncludeCiphers = null;
-  private List<String> sslExcludeCiphers = null;
-  private List<String> sslExcludeProtocols = null;
+  private List<String> sslIncludeCiphers;
+  private List<String> sslExcludeCiphers;
+  private List<String> sslExcludeProtocols;
   private boolean clientAuthNeeded;
   private boolean trustAllCerts;
   private String truststorePath;
@@ -241,7 +242,7 @@ public class JettySSLService implements SSLService {
 
   private static KeyStore loadKeyStore( String fileName, String storeType, char[] storePass ) throws CertificateException, NoSuchAlgorithmException, IOException, KeyStoreException {
     KeyStore keystore = KeyStore.getInstance(storeType);
-    try (InputStream is = new FileInputStream(fileName)) {
+    try (InputStream is = Files.newInputStream(Paths.get(fileName))) {
       keystore.load(is, storePass);
     }
     return keystore;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/DefaultTokenAuthorityService.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/DefaultTokenAuthorityService.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/DefaultTokenAuthorityService.java
index b32e914..b9e606f 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/DefaultTokenAuthorityService.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/DefaultTokenAuthorityService.java
@@ -51,9 +51,9 @@ public class DefaultTokenAuthorityService implements JWTokenAuthority, Service {
 
   private static final String SIGNING_KEY_PASSPHRASE = "signing.key.passphrase";
   private static final Set<String> SUPPORTED_SIG_ALGS = new HashSet<>();
-  private AliasService as = null;
-  private KeystoreService ks = null;
-  String signingKeyAlias = null;
+  private AliasService as;
+  private KeystoreService ks;
+  String signingKeyAlias;
 
   static {
       // Only standard RSA signature algorithms are accepted

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/services/topology/impl/DefaultClusterConfigurationMonitorService.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/topology/impl/DefaultClusterConfigurationMonitorService.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/topology/impl/DefaultClusterConfigurationMonitorService.java
index 60ee562..d3bd40a 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/topology/impl/DefaultClusterConfigurationMonitorService.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/topology/impl/DefaultClusterConfigurationMonitorService.java
@@ -30,7 +30,7 @@ import java.util.ServiceLoader;
 
 public class DefaultClusterConfigurationMonitorService implements ClusterConfigurationMonitorService {
 
-    private AliasService aliasService = null;
+    private AliasService aliasService;
 
     private Map<String, ClusterConfigurationMonitor> monitors = new HashMap<>();
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/services/topology/impl/DefaultTopologyService.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/topology/impl/DefaultTopologyService.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/topology/impl/DefaultTopologyService.java
index cdc4907..2d501f1 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/topology/impl/DefaultTopologyService.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/topology/impl/DefaultTopologyService.java
@@ -114,7 +114,7 @@ public class DefaultTopologyService
   private volatile Map<File, Topology> topologies;
   private AliasService aliasService;
 
-  private RemoteConfigurationMonitor remoteMonitor = null;
+  private RemoteConfigurationMonitor remoteMonitor;
 
   private GatewayConfig config;
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/topology/discovery/DefaultServiceDiscoveryConfig.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/topology/discovery/DefaultServiceDiscoveryConfig.java b/gateway-server/src/main/java/org/apache/knox/gateway/topology/discovery/DefaultServiceDiscoveryConfig.java
index d6e3d50..52913e8 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/topology/discovery/DefaultServiceDiscoveryConfig.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/topology/discovery/DefaultServiceDiscoveryConfig.java
@@ -18,8 +18,8 @@ package org.apache.knox.gateway.topology.discovery;
 
 public class DefaultServiceDiscoveryConfig implements ServiceDiscoveryConfig {
     private String address;
-    private String user     = null;
-    private String pwdAlias = null;
+    private String user;
+    private String pwdAlias;
 
     public DefaultServiceDiscoveryConfig(String address) {
         this.address = address;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/topology/monitor/DefaultRemoteConfigurationMonitor.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/topology/monitor/DefaultRemoteConfigurationMonitor.java b/gateway-server/src/main/java/org/apache/knox/gateway/topology/monitor/DefaultRemoteConfigurationMonitor.java
index d209d73..82242a3 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/topology/monitor/DefaultRemoteConfigurationMonitor.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/topology/monitor/DefaultRemoteConfigurationMonitor.java
@@ -103,7 +103,7 @@ class DefaultRemoteConfigurationMonitor implements RemoteConfigurationMonitor {
         };
     }
 
-    private RemoteConfigurationRegistryClient client = null;
+    private RemoteConfigurationRegistryClient client;
 
     private File providersDir;
     private File descriptorsDir;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/topology/monitor/RemoteConfigurationMonitorFactory.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/topology/monitor/RemoteConfigurationMonitorFactory.java b/gateway-server/src/main/java/org/apache/knox/gateway/topology/monitor/RemoteConfigurationMonitorFactory.java
index 07c3842..83eeed4 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/topology/monitor/RemoteConfigurationMonitorFactory.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/topology/monitor/RemoteConfigurationMonitorFactory.java
@@ -29,7 +29,7 @@ public class RemoteConfigurationMonitorFactory {
 
     private static final GatewayMessages log = MessagesFactory.get(GatewayMessages.class);
 
-    private static RemoteConfigurationRegistryClientService remoteConfigRegistryClientService = null;
+    private static RemoteConfigurationRegistryClientService remoteConfigRegistryClientService;
 
     public static void setClientService(RemoteConfigurationRegistryClientService clientService) {
         remoteConfigRegistryClientService = clientService;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/ProviderConfigurationParser.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/ProviderConfigurationParser.java b/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/ProviderConfigurationParser.java
index 1408ca9..45d10c2 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/ProviderConfigurationParser.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/ProviderConfigurationParser.java
@@ -28,9 +28,9 @@ import javax.xml.bind.annotation.XmlAccessorType;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -86,7 +86,7 @@ public class ProviderConfigurationParser {
 
 
   static ProviderConfiguration parseXML(File file) throws Exception {
-    return parseXML(new FileInputStream(file));
+    return parseXML(Files.newInputStream(file.toPath()));
   }
 
 
@@ -102,7 +102,7 @@ public class ProviderConfigurationParser {
 
 
   static ProviderConfiguration parseJSON(File file) throws IOException {
-    return parseJSON(new FileInputStream(file));
+    return parseJSON(Files.newInputStream(file.toPath()));
   }
 
 
@@ -113,7 +113,7 @@ public class ProviderConfigurationParser {
 
 
   static ProviderConfiguration parseYAML(File file) throws IOException {
-    return parseYAML(new FileInputStream(file));
+    return parseYAML(Files.newInputStream(file.toPath()));
   }
 
   static ProviderConfiguration parseYAML(InputStream in) throws IOException {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/SimpleDescriptorHandler.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/SimpleDescriptorHandler.java b/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/SimpleDescriptorHandler.java
index 4df2cf1..84af519 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/SimpleDescriptorHandler.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/SimpleDescriptorHandler.java
@@ -30,7 +30,6 @@ import org.apache.knox.gateway.topology.discovery.ServiceDiscoveryFactory;
 
 import java.io.BufferedWriter;
 import java.io.File;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
@@ -38,6 +37,7 @@ import java.io.StringWriter;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
@@ -574,7 +574,7 @@ public class SimpleDescriptorHandler {
             }
             topologyDescriptor = new File(destDirectory, topologyFilename + ".xml");
 
-            try (OutputStream outputStream = new FileOutputStream(topologyDescriptor);
+            try (OutputStream outputStream = Files.newOutputStream(topologyDescriptor.toPath());
                  OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream, StandardCharsets.UTF_8);
                  BufferedWriter fw = new BufferedWriter(outputStreamWriter)) {
               fw.write(sw.toString());

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/SimpleDescriptorImpl.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/SimpleDescriptorImpl.java b/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/SimpleDescriptorImpl.java
index 50092cf..535e1a9 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/SimpleDescriptorImpl.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/topology/simple/SimpleDescriptorImpl.java
@@ -49,7 +49,7 @@ class SimpleDescriptorImpl implements SimpleDescriptor {
     @JsonProperty("applications")
     private List<ApplicationImpl> applications;
 
-    private String name = null;
+    private String name;
 
     void setName(String name) {
         this.name = name;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/topology/validation/TopologyValidator.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/topology/validation/TopologyValidator.java b/gateway-server/src/main/java/org/apache/knox/gateway/topology/validation/TopologyValidator.java
index 0b678a2..5561087 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/topology/validation/TopologyValidator.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/topology/validation/TopologyValidator.java
@@ -37,7 +37,7 @@ import org.xml.sax.SAXParseException;
 
 public class TopologyValidator {
 
-  private Collection<String> errors = null;
+  private Collection<String> errors;
   private final String filePath;
 
   public TopologyValidator(Topology t){
@@ -104,7 +104,6 @@ public class TopologyValidator {
   }
 
   public Collection<String> getTopologyErrors(){
-
     if(errors != null){
       return errors;
     }else{
@@ -115,11 +114,9 @@ public class TopologyValidator {
 
   public String getErrorString(){
     StringBuilder out = new StringBuilder();
-    out.append("");
     for(String s : getTopologyErrors()){
-      out.append(s).append("\n");
+      out.append(s).append('\n');
     }
     return out.toString();
   }
-
 }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/trace/AccessHandler.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/trace/AccessHandler.java b/gateway-server/src/main/java/org/apache/knox/gateway/trace/AccessHandler.java
index 558a739..53eef68 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/trace/AccessHandler.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/trace/AccessHandler.java
@@ -24,30 +24,28 @@ import org.eclipse.jetty.server.Response;
 import org.eclipse.jetty.util.component.AbstractLifeCycle;
 
 public class AccessHandler extends AbstractLifeCycle implements RequestLog {
-
   private static Logger log = Logger.getLogger( "org.apache.knox.gateway.access" );
 
   @Override
   public void log( Request request, Response response ) {
     if( log.isTraceEnabled() ) {
       StringBuilder sb = new StringBuilder();
-      TraceUtil.appendCorrelationContext( sb );
-      sb.append( "|" );
-      sb.append( request.getRemoteAddr() );
-      sb.append( "|" );
-      sb.append( request.getMethod() );
-      sb.append( "|" );
-      sb.append( request.getHttpURI() );
-      sb.append( "|" );
-      sb.append( request.getContentLength() );
-      sb.append( "|" );
-      sb.append( response.getStatus() );
-      sb.append( "|" );
-      sb.append( response.getContentCount() );
-      sb.append( "|" );
-      sb.append( System.currentTimeMillis() - request.getTimeStamp() );
-      log.trace( sb );
+      TraceUtil.appendCorrelationContext(sb);
+      sb.append('|')
+          .append(request.getRemoteAddr())
+          .append('|')
+          .append(request.getMethod())
+          .append('|')
+          .append(request.getHttpURI())
+          .append('|')
+          .append(request.getContentLength())
+          .append('|')
+          .append(response.getStatus())
+          .append('|')
+          .append(response.getContentCount())
+          .append('|')
+          .append(System.currentTimeMillis() - request.getTimeStamp());
+      log.trace(sb);
     }
   }
-
 }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceRequest.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceRequest.java b/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceRequest.java
index e40ef98..a48501e 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceRequest.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceRequest.java
@@ -55,17 +55,16 @@ class TraceRequest extends HttpServletRequestWrapper {
   private void traceRequestDetails() {
     StringBuilder sb = new StringBuilder();
     TraceUtil.appendCorrelationContext( sb );
-    sb.append( "|Request=" );
-    sb.append( getMethod() );
-    sb.append( " " );
-    sb.append( getRequestURI() );
+    sb.append("|Request=")
+        .append(getMethod())
+        .append(' ')
+        .append(getRequestURI());
     String qs = getQueryString();
     if( qs != null ) {
-      sb.append( "?" );
-      sb.append( qs );
+      sb.append('?').append(qs);
     }
-    appendHeaders( sb );
-    log.trace( sb.toString() );
+    appendHeaders(sb);
+    log.trace(sb.toString());
   }
 
   private void appendHeaders( StringBuilder sb ) {
@@ -81,5 +80,4 @@ class TraceRequest extends HttpServletRequestWrapper {
       }
     }
   }
-
 }
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceResponse.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceResponse.java b/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceResponse.java
index e954338..8605199 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceResponse.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceResponse.java
@@ -57,8 +57,8 @@ class TraceResponse extends HttpServletResponseWrapper {
   private void traceResponseDetails() {
     StringBuilder sb = new StringBuilder();
     TraceUtil.appendCorrelationContext( sb );
-    sb.append( "|Response=" );
-    sb.append( getStatus() );
+    sb.append( "|Response=" )
+        .append( getStatus() );
     appendHeaders( sb );
     log.trace( sb.toString() );
   }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceUtil.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceUtil.java b/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceUtil.java
index c7f0c6b..d3fda4e 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceUtil.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/trace/TraceUtil.java
@@ -35,9 +35,9 @@ public class TraceUtil {
       sb.append( "||" );
     } else {
       append( sb, cc.getRootRequestId() );
-      sb.append( "|" );
+      sb.append('|');
       append( sb, cc.getParentRequestId() );
-      sb.append( "|" );
+      sb.append('|');
       append( sb, cc.getRequestId() );
     }
   }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/util/KnoxCLI.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/util/KnoxCLI.java b/gateway-server/src/main/java/org/apache/knox/gateway/util/KnoxCLI.java
index 2fae90e..6355d5e 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/util/KnoxCLI.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/util/KnoxCLI.java
@@ -119,24 +119,24 @@ public class KnoxCLI extends Configured implements Tool {
 
   private static GatewayServices services = new CLIGatewayServices();
   private Command command;
-  private String value = null;
-  private String cluster = null;
-  private String path = null;
+  private String value;
+  private String cluster;
+  private String path;
   private String generate = "false";
-  private String hostname = null;
-  private String port = null;
-  private boolean force = false;
-  private boolean debug = false;
-  private String user = null;
-  private String pass = null;
-  private boolean groups = false;
+  private String hostname;
+  private String port;
+  private boolean force;
+  private boolean debug;
+  private String user;
+  private String pass;
+  private boolean groups;
 
-  private String remoteRegistryClient = null;
-  private String remoteRegistryEntryName = null;
+  private String remoteRegistryClient;
+  private String remoteRegistryEntryName;
 
   // For testing only
-  private String master = null;
-  private String type = null;
+  private String master;
+  private String type;
 
   @Override
   public int run(String[] args) throws Exception {
@@ -1056,8 +1056,8 @@ public class KnoxCLI extends Configured implements Tool {
 
     public static final String USAGE = "ldap-command";
     public static final String DESC = "This is an internal command. It should not be used.";
-    protected String username = null;
-    protected char[] password = null;
+    protected String username;
+    protected char[] password;
     protected static final String debugMessage = "For more information use --d for debug output.";
     protected Topology topology;
 
@@ -1637,7 +1637,7 @@ public class KnoxCLI extends Configured implements Tool {
                         "Errors are reported and suggestions to resolve any problems are returned. JSON formatted.\n";
 
     private boolean ssl = true;
-    private int attempts = 0;
+    private int attempts;
 
     @Override
     public String getUsage() { return USAGE + ":\n\n" + DESC; }
@@ -1888,7 +1888,7 @@ public class KnoxCLI extends Configured implements Tool {
    * Base class for remote config registry upload commands
    */
   public abstract class RemoteRegistryUploadCommand extends RemoteRegistryCommand {
-    private File sourceFile = null;
+    private File sourceFile;
     protected String filename;
 
     protected RemoteRegistryUploadCommand(String sourceFileName) {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/util/ServiceDefinitionsLoader.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/util/ServiceDefinitionsLoader.java b/gateway-server/src/main/java/org/apache/knox/gateway/util/ServiceDefinitionsLoader.java
index 63283cb..fad219b 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/util/ServiceDefinitionsLoader.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/util/ServiceDefinitionsLoader.java
@@ -32,13 +32,13 @@ import javax.xml.bind.JAXBContext;
 import javax.xml.bind.JAXBException;
 import javax.xml.bind.Unmarshaller;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.Reader;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.Set;
@@ -58,7 +58,7 @@ public class ServiceDefinitionsLoader {
         Unmarshaller unmarshaller = context.createUnmarshaller();
 
         for ( File file : getFileList(servicesDir) ) {
-          try (InputStream inputStream = new FileInputStream(file)) {
+          try (InputStream inputStream = Files.newInputStream(file.toPath())) {
             ServiceDefinition definition = (ServiceDefinition) unmarshaller.unmarshal(inputStream);
             //look for rewrite rules as a sibling (for now)
             UrlRewriteRulesDescriptor rewriteRulesDescriptor = loadRewriteRules(file.getParentFile());
@@ -119,7 +119,7 @@ public class ServiceDefinitionsLoader {
   public static UrlRewriteRulesDescriptor loadRewriteRules(File servicesDir) {
     File rewriteFile = new File(servicesDir, REWRITE_FILE);
     if ( rewriteFile.exists() ) {
-      try (InputStream stream = new FileInputStream(rewriteFile);
+      try (InputStream stream = Files.newInputStream(rewriteFile.toPath());
            Reader reader = new InputStreamReader(stream, StandardCharsets.UTF_8)) {
         return UrlRewriteRulesDescriptorFactory.load("xml", reader);
       } catch ( FileNotFoundException e ) {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/main/java/org/apache/knox/gateway/websockets/GatewayWebsocketHandler.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/websockets/GatewayWebsocketHandler.java b/gateway-server/src/main/java/org/apache/knox/gateway/websockets/GatewayWebsocketHandler.java
index 1e8e8a9..ec97e5f 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/websockets/GatewayWebsocketHandler.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/websockets/GatewayWebsocketHandler.java
@@ -195,8 +195,8 @@ public class GatewayWebsocketHandler extends WebSocketHandler
                 || serviceUrl.getProtocol().equals("wss")) ? serviceUrl.getProtocol()
                 : "ws";
         backend.append(protocol).append("://");
-        backend.append(serviceUrl.getHost()).append(":");
-        backend.append(serviceUrl.getPort()).append("/");
+        backend.append(serviceUrl.getHost()).append(':');
+        backend.append(serviceUrl.getPort()).append('/');
         backend.append(serviceUrl.getPath());
       }
       else {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/test/java/org/apache/knox/gateway/jetty/SslSocketTest.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/test/java/org/apache/knox/gateway/jetty/SslSocketTest.java b/gateway-server/src/test/java/org/apache/knox/gateway/jetty/SslSocketTest.java
index a3cd6cd..e4e0d35 100644
--- a/gateway-server/src/test/java/org/apache/knox/gateway/jetty/SslSocketTest.java
+++ b/gateway-server/src/test/java/org/apache/knox/gateway/jetty/SslSocketTest.java
@@ -64,7 +64,7 @@ public class SslSocketTest {
 
   public class SslServer implements Runnable {
 
-    private boolean ready = false;
+    private boolean ready;
 
     public boolean waitUntilReady() throws InterruptedException {
       synchronized( this ) {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/test/java/org/apache/knox/gateway/services/security/CryptoServiceTest.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/test/java/org/apache/knox/gateway/services/security/CryptoServiceTest.java b/gateway-server/src/test/java/org/apache/knox/gateway/services/security/CryptoServiceTest.java
index c28dcaa..3204630 100644
--- a/gateway-server/src/test/java/org/apache/knox/gateway/services/security/CryptoServiceTest.java
+++ b/gateway-server/src/test/java/org/apache/knox/gateway/services/security/CryptoServiceTest.java
@@ -38,8 +38,8 @@ import static org.junit.Assert.assertEquals;
 
 @Category( { ManualTests.class, MediumTests.class } )
 public class CryptoServiceTest {
-  private static CryptoService cs = null;
-  private static AliasService as = null;
+  private static CryptoService cs;
+  private static AliasService as;
 
   @BeforeClass
   public static void setupSuite() throws Exception {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/test/java/org/apache/knox/gateway/topology/simple/ProviderConfigurationParserTest.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/test/java/org/apache/knox/gateway/topology/simple/ProviderConfigurationParserTest.java b/gateway-server/src/test/java/org/apache/knox/gateway/topology/simple/ProviderConfigurationParserTest.java
index b8c8f3c..50d2e52 100644
--- a/gateway-server/src/test/java/org/apache/knox/gateway/topology/simple/ProviderConfigurationParserTest.java
+++ b/gateway-server/src/test/java/org/apache/knox/gateway/topology/simple/ProviderConfigurationParserTest.java
@@ -38,7 +38,7 @@ import static org.junit.Assert.assertTrue;
 
 public class ProviderConfigurationParserTest {
 
-  private static File tmpDir = null;
+  private static File tmpDir;
 
   @BeforeClass
   public static void createTempDir() {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/test/java/org/apache/knox/gateway/websockets/ProxyInboundClientTest.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/test/java/org/apache/knox/gateway/websockets/ProxyInboundClientTest.java b/gateway-server/src/test/java/org/apache/knox/gateway/websockets/ProxyInboundClientTest.java
index a56ea49..c445254 100644
--- a/gateway-server/src/test/java/org/apache/knox/gateway/websockets/ProxyInboundClientTest.java
+++ b/gateway-server/src/test/java/org/apache/knox/gateway/websockets/ProxyInboundClientTest.java
@@ -50,9 +50,9 @@ public class ProxyInboundClientTest {
   private static URI serverUri;
   private static Handler handler;
 
-  String recievedMessage = null;
+  String recievedMessage;
 
-  byte[] recievedBinaryMessage = null;
+  byte[] recievedBinaryMessage;
 
 
   /* create an instance */

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-server/src/test/java/org/apache/knox/gateway/websockets/WebsocketClient.java
----------------------------------------------------------------------
diff --git a/gateway-server/src/test/java/org/apache/knox/gateway/websockets/WebsocketClient.java b/gateway-server/src/test/java/org/apache/knox/gateway/websockets/WebsocketClient.java
index 08ac45f..6cb9cd1 100644
--- a/gateway-server/src/test/java/org/apache/knox/gateway/websockets/WebsocketClient.java
+++ b/gateway-server/src/test/java/org/apache/knox/gateway/websockets/WebsocketClient.java
@@ -40,14 +40,14 @@ import org.eclipse.jetty.util.BlockingArrayQueue;
 @ClientEndpoint
 public class WebsocketClient {
 
-  private Session session = null;
-  public CloseReason close = null;
+  private Session session;
+  public CloseReason close;
   public MessageQueue messageQueue = new MessageQueue();
   public LinkedList<Throwable> errors = new LinkedList<>();
   public CountDownLatch closeLatch = new CountDownLatch(1);
 
-  public boolean onError = false;
-  public String errorMessage = null;
+  public boolean onError;
+  public String errorMessage;
 
   @OnClose
   public void onWebSocketClose(CloseReason reason) {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-service-admin/src/main/java/org/apache/knox/gateway/service/admin/TopologiesResource.java
----------------------------------------------------------------------
diff --git a/gateway-service-admin/src/main/java/org/apache/knox/gateway/service/admin/TopologiesResource.java b/gateway-service-admin/src/main/java/org/apache/knox/gateway/service/admin/TopologiesResource.java
index b9e0e00..463b86b 100644
--- a/gateway-service-admin/src/main/java/org/apache/knox/gateway/service/admin/TopologiesResource.java
+++ b/gateway-service-admin/src/main/java/org/apache/knox/gateway/service/admin/TopologiesResource.java
@@ -553,10 +553,7 @@ public class TopologiesResource {
     }else{
       gatewayPath = "gateway";
     }
-    uri += "/" + gatewayPath;
-
-    uri += "/" + topology.getName();
-    return uri;
+    return uri + "/" + gatewayPath + "/" + topology.getName();
   }
 
   String buildHref(HttpServletRequest req) {
@@ -564,20 +561,20 @@ public class TopologiesResource {
   }
 
   String buildHref(String id, HttpServletRequest req) {
-    String href = buildXForwardBaseURL(req);
+    StringBuilder href = new StringBuilder(buildXForwardBaseURL(req));
     // Make sure that the pathInfo doesn't have any '/' chars at the end.
     String pathInfo = req.getPathInfo();
     while(pathInfo.endsWith("/")) {
       pathInfo = pathInfo.substring(0, pathInfo.length() - 1);
     }
 
-    href += pathInfo;
+    href.append(pathInfo);
 
     if (id != null) {
-      href += "/" + id;
+      href.append('/').append(id);
     }
 
-    return href;
+    return href.toString();
   }
 
    String buildHref(org.apache.knox.gateway.topology.Topology t, HttpServletRequest req) {
@@ -598,43 +595,43 @@ public class TopologiesResource {
     final String X_Forwarded_Port = X_Forwarded + "Port";
     final String X_Forwarded_Server = X_Forwarded + "Server";
 
-    String baseURL = "";
+    StringBuilder baseURL = new StringBuilder();
 
     // Get Protocol
     if(req.getHeader(X_Forwarded_Proto) != null){
-      baseURL += req.getHeader(X_Forwarded_Proto) + "://";
+      baseURL.append(req.getHeader(X_Forwarded_Proto)).append("://");
     } else {
-      baseURL += req.getProtocol() + "://";
+      baseURL.append(req.getProtocol()).append("://");
     }
 
     // Handle Server/Host and Port Here
     if (req.getHeader(X_Forwarded_Host) != null && req.getHeader(X_Forwarded_Port) != null){
       // Double check to see if host has port
       if(req.getHeader(X_Forwarded_Host).contains(req.getHeader(X_Forwarded_Port))){
-        baseURL += req.getHeader(X_Forwarded_Host);
+        baseURL.append(req.getHeader(X_Forwarded_Host));
       } else {
         // If there's no port, add the host and port together;
-        baseURL += req.getHeader(X_Forwarded_Host) + ":" + req.getHeader(X_Forwarded_Port);
+        baseURL.append(req.getHeader(X_Forwarded_Host)).append(':').append(req.getHeader(X_Forwarded_Port));
       }
     } else if(req.getHeader(X_Forwarded_Server) != null && req.getHeader(X_Forwarded_Port) != null){
       // Tack on the server and port if they're available. Try host if server not available
-      baseURL += req.getHeader(X_Forwarded_Server) + ":" + req.getHeader(X_Forwarded_Port);
+      baseURL.append(req.getHeader(X_Forwarded_Server)).append(':').append(req.getHeader(X_Forwarded_Port));
     } else if(req.getHeader(X_Forwarded_Port) != null) {
       // if we at least have a port, we can use it.
-      baseURL += req.getServerName() + ":" + req.getHeader(X_Forwarded_Port);
+      baseURL.append(req.getServerName()).append(':').append(req.getHeader(X_Forwarded_Port));
     } else {
       // Resort to request members
-      baseURL += req.getServerName() + ":" + req.getLocalPort();
+      baseURL.append(req.getServerName()).append(':').append(req.getLocalPort());
     }
 
     // Handle Server context
     if( req.getHeader(X_Forwarded_Context) != null ) {
-      baseURL += req.getHeader( X_Forwarded_Context );
+      baseURL.append(req.getHeader( X_Forwarded_Context ));
     } else {
-      baseURL += req.getContextPath();
+      baseURL.append(req.getContextPath());
     }
 
-    return baseURL;
+    return baseURL.toString();
   }
 
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-service-definitions/src/main/java/org/apache/knox/gateway/service/definition/CustomDispatch.java
----------------------------------------------------------------------
diff --git a/gateway-service-definitions/src/main/java/org/apache/knox/gateway/service/definition/CustomDispatch.java b/gateway-service-definitions/src/main/java/org/apache/knox/gateway/service/definition/CustomDispatch.java
index 5091aed..35ed198 100644
--- a/gateway-service-definitions/src/main/java/org/apache/knox/gateway/service/definition/CustomDispatch.java
+++ b/gateway-service-definitions/src/main/java/org/apache/knox/gateway/service/definition/CustomDispatch.java
@@ -33,7 +33,7 @@ public class CustomDispatch {
 
   private String httpClientFactory;
 
-  private boolean useTwoWaySsl = false;
+  private boolean useTwoWaySsl;
 
   @XmlAttribute(name = "contributor-name")
   public String getContributorName() {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-service-hive/src/main/java/org/apache/knox/gateway/hive/HiveDispatch.java
----------------------------------------------------------------------
diff --git a/gateway-service-hive/src/main/java/org/apache/knox/gateway/hive/HiveDispatch.java b/gateway-service-hive/src/main/java/org/apache/knox/gateway/hive/HiveDispatch.java
index 4ddbe46..97dc8c1 100644
--- a/gateway-service-hive/src/main/java/org/apache/knox/gateway/hive/HiveDispatch.java
+++ b/gateway-service-hive/src/main/java/org/apache/knox/gateway/hive/HiveDispatch.java
@@ -27,7 +27,7 @@ import org.apache.http.client.methods.HttpUriRequest;
  * default HttpClientDispatch.
  */
 public class HiveDispatch extends DefaultDispatch {
-  private boolean basicAuthPreemptive = false;
+  private boolean basicAuthPreemptive;
 
   @Override
   public void init() {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-service-hive/src/main/java/org/apache/knox/gateway/hive/HiveHaDispatch.java
----------------------------------------------------------------------
diff --git a/gateway-service-hive/src/main/java/org/apache/knox/gateway/hive/HiveHaDispatch.java b/gateway-service-hive/src/main/java/org/apache/knox/gateway/hive/HiveHaDispatch.java
index 9403a2c..f60b324 100644
--- a/gateway-service-hive/src/main/java/org/apache/knox/gateway/hive/HiveHaDispatch.java
+++ b/gateway-service-hive/src/main/java/org/apache/knox/gateway/hive/HiveHaDispatch.java
@@ -25,7 +25,7 @@ import org.apache.http.client.methods.HttpUriRequest;
 
 public class HiveHaDispatch extends DefaultHaDispatch {
 
-  private boolean basicAuthPreemptive = false;
+  private boolean basicAuthPreemptive;
 
   public HiveHaDispatch() {
     setServiceRole("HIVE");

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-service-knoxsso/src/main/java/org/apache/knox/gateway/service/knoxsso/WebSSOResource.java
----------------------------------------------------------------------
diff --git a/gateway-service-knoxsso/src/main/java/org/apache/knox/gateway/service/knoxsso/WebSSOResource.java b/gateway-service-knoxsso/src/main/java/org/apache/knox/gateway/service/knoxsso/WebSSOResource.java
index ab3702b..04bc9bd 100644
--- a/gateway-service-knoxsso/src/main/java/org/apache/knox/gateway/service/knoxsso/WebSSOResource.java
+++ b/gateway-service-knoxsso/src/main/java/org/apache/knox/gateway/service/knoxsso/WebSSOResource.java
@@ -85,17 +85,17 @@ public class WebSSOResource {
   private static final long TOKEN_TTL_DEFAULT = 30000L;
   static final String RESOURCE_PATH = "/api/v1/websso";
   private static KnoxSSOMessages log = MessagesFactory.get( KnoxSSOMessages.class );
-  private String cookieName = null;
+  private String cookieName;
   private boolean secureOnly = true;
   private int maxAge = -1;
   private long tokenTTL = TOKEN_TTL_DEFAULT;
-  private String whitelist = null;
-  private String domainSuffix = null;
+  private String whitelist;
+  private String domainSuffix;
   private List<String> targetAudiences = new ArrayList<>();
-  private boolean enableSession = false;
+  private boolean enableSession;
   private String signatureAlgorithm = "RS256";
   private List<String> ssoExpectedparams = new ArrayList<>();
-  private String clusterName = null;
+  private String clusterName;
 
   @Context
   HttpServletRequest request;
@@ -300,20 +300,20 @@ public class WebSSOResource {
           && !ssoExpectedparams.contains(entry.getKey())) {
 
         if(first) {
-          buf.append("?");
+          buf.append('?');
           first = false;
         }
 
-        buf.append("&").append(entry.getKey());
+        buf.append('&').append(entry.getKey());
         String[] values = entry.getValue();
         if (values.length > 0 && values[0] != null) {
-          buf.append("=");
+          buf.append('=');
         }
         for (int i = 0; i < values.length; i++) {
           if (values[0] != null) {
             buf.append(values[i]);
             if (i < values.length-1) {
-              buf.append("&").append(entry.getKey()).append("=");
+              buf.append('&').append(entry.getKey()).append('=');
             }
           }
         }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-service-knoxssout/src/main/java/org/apache/knox/gateway/service/knoxsso/WebSSOutResource.java
----------------------------------------------------------------------
diff --git a/gateway-service-knoxssout/src/main/java/org/apache/knox/gateway/service/knoxsso/WebSSOutResource.java b/gateway-service-knoxssout/src/main/java/org/apache/knox/gateway/service/knoxsso/WebSSOutResource.java
index 4b20f9b..1520968 100644
--- a/gateway-service-knoxssout/src/main/java/org/apache/knox/gateway/service/knoxsso/WebSSOutResource.java
+++ b/gateway-service-knoxssout/src/main/java/org/apache/knox/gateway/service/knoxsso/WebSSOutResource.java
@@ -46,7 +46,7 @@ public class WebSSOutResource {
 
   static final String RESOURCE_PATH = "/api/v1/webssout";
 
-  private String cookieName = null;
+  private String cookieName;
 
   @Context
   HttpServletRequest request;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-service-knoxtoken/src/main/java/org/apache/knox/gateway/service/knoxtoken/TokenResource.java
----------------------------------------------------------------------
diff --git a/gateway-service-knoxtoken/src/main/java/org/apache/knox/gateway/service/knoxtoken/TokenResource.java b/gateway-service-knoxtoken/src/main/java/org/apache/knox/gateway/service/knoxtoken/TokenResource.java
index 9371c4a..1c35668 100644
--- a/gateway-service-knoxtoken/src/main/java/org/apache/knox/gateway/service/knoxtoken/TokenResource.java
+++ b/gateway-service-knoxtoken/src/main/java/org/apache/knox/gateway/service/knoxtoken/TokenResource.java
@@ -62,10 +62,10 @@ public class TokenResource {
   private static TokenServiceMessages log = MessagesFactory.get( TokenServiceMessages.class );
   private long tokenTTL = TOKEN_TTL_DEFAULT;
   private List<String> targetAudiences = new ArrayList<>();
-  private String tokenTargetUrl = null;
-  private Map<String,Object> tokenClientDataMap = null;
+  private String tokenTargetUrl;
+  private Map<String,Object> tokenClientDataMap;
   private ArrayList<String> allowedDNs = new ArrayList<>();
-  private boolean clientCertRequired = false;
+  private boolean clientCertRequired;
   private String signatureAlgorithm = "RS256";
 
   @Context

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-service-remoteconfig/src/main/java/org/apache/knox/gateway/service/config/remote/zk/CuratorClientService.java
----------------------------------------------------------------------
diff --git a/gateway-service-remoteconfig/src/main/java/org/apache/knox/gateway/service/config/remote/zk/CuratorClientService.java b/gateway-service-remoteconfig/src/main/java/org/apache/knox/gateway/service/config/remote/zk/CuratorClientService.java
index b419c9c..b779e67 100644
--- a/gateway-service-remoteconfig/src/main/java/org/apache/knox/gateway/service/config/remote/zk/CuratorClientService.java
+++ b/gateway-service-remoteconfig/src/main/java/org/apache/knox/gateway/service/config/remote/zk/CuratorClientService.java
@@ -64,7 +64,7 @@ class CuratorClientService implements ZooKeeperClientService {
 
     private Map<String, RemoteConfigurationRegistryClient> clients = new HashMap<>();
 
-    private AliasService aliasService = null;
+    private AliasService aliasService;
 
 
     @Override

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-service-rm/src/main/java/org/apache/knox/gateway/rm/dispatch/RMHaBaseDispatcher.java
----------------------------------------------------------------------
diff --git a/gateway-service-rm/src/main/java/org/apache/knox/gateway/rm/dispatch/RMHaBaseDispatcher.java b/gateway-service-rm/src/main/java/org/apache/knox/gateway/rm/dispatch/RMHaBaseDispatcher.java
index e3770ed..caec73a 100644
--- a/gateway-service-rm/src/main/java/org/apache/knox/gateway/rm/dispatch/RMHaBaseDispatcher.java
+++ b/gateway-service-rm/src/main/java/org/apache/knox/gateway/rm/dispatch/RMHaBaseDispatcher.java
@@ -41,8 +41,8 @@ class  RMHaBaseDispatcher extends DefaultDispatch {
     private static final RMMessages LOG = MessagesFactory.get(RMMessages.class);
     private int maxFailoverAttempts = HaServiceConfigConstants.DEFAULT_MAX_FAILOVER_ATTEMPTS;
     private int failoverSleep = HaServiceConfigConstants.DEFAULT_FAILOVER_SLEEP;
-    private String resourceRole = null;
-    private HttpResponse inboundResponse = null;
+    private String resourceRole;
+    private HttpResponse inboundResponse;
 
     /**
      *

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-service-test/src/main/java/org/apache/knox/gateway/service/test/ServiceTestResource.java
----------------------------------------------------------------------
diff --git a/gateway-service-test/src/main/java/org/apache/knox/gateway/service/test/ServiceTestResource.java b/gateway-service-test/src/main/java/org/apache/knox/gateway/service/test/ServiceTestResource.java
index b169e95..5e6e0f2 100644
--- a/gateway-service-test/src/main/java/org/apache/knox/gateway/service/test/ServiceTestResource.java
+++ b/gateway-service-test/src/main/java/org/apache/knox/gateway/service/test/ServiceTestResource.java
@@ -20,10 +20,10 @@ package org.apache.knox.gateway.service.test;
 import org.apache.http.client.methods.CloseableHttpResponse;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.utils.URIBuilder;
-import org.apache.http.conn.ssl.SSLContexts;
 import org.apache.http.conn.ssl.TrustSelfSignedStrategy;
 import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.HttpClients;
+import org.apache.http.ssl.SSLContexts;
 import org.apache.knox.gateway.config.GatewayConfig;
 import org.apache.knox.gateway.services.GatewayServices;
 import org.apache.knox.gateway.services.topology.TopologyService;
@@ -218,43 +218,43 @@ public class ServiceTestResource {
     final String X_Forwarded_Port = X_Forwarded + "Port";
     final String X_Forwarded_Server = X_Forwarded + "Server";
 
-    String baseURL = "";
+    StringBuilder baseURL = new StringBuilder();
 
 //    Get Protocol
     if(req.getHeader(X_Forwarded_Proto) != null){
-      baseURL += req.getHeader(X_Forwarded_Proto) + "://";
+      baseURL.append(req.getHeader(X_Forwarded_Proto)).append("://");
     } else {
-      baseURL += req.getProtocol() + "://";
+      baseURL.append(req.getProtocol()).append("://");
     }
 
 //    Handle Server/Host and Port Here
     if (req.getHeader(X_Forwarded_Host) != null && req.getHeader(X_Forwarded_Port) != null){
 //        Double check to see if host has port
       if(req.getHeader(X_Forwarded_Host).contains(req.getHeader(X_Forwarded_Port))){
-        baseURL += req.getHeader(X_Forwarded_Host);
+        baseURL.append(req.getHeader(X_Forwarded_Host));
       } else {
 //        If there's no port, add the host and port together;
-        baseURL += req.getHeader(X_Forwarded_Host) + ":" + req.getHeader(X_Forwarded_Port);
+        baseURL.append(req.getHeader(X_Forwarded_Host)).append(':').append(req.getHeader(X_Forwarded_Port));
       }
     } else if(req.getHeader(X_Forwarded_Server) != null && req.getHeader(X_Forwarded_Port) != null){
 //      Tack on the server and port if they're available. Try host if server not available
-      baseURL += req.getHeader(X_Forwarded_Server) + ":" + req.getHeader(X_Forwarded_Port);
+      baseURL.append(req.getHeader(X_Forwarded_Server)).append(':').append(req.getHeader(X_Forwarded_Port));
     } else if(req.getHeader(X_Forwarded_Port) != null) {
 //      if we at least have a port, we can use it.
-      baseURL += req.getServerName() + ":" + req.getHeader(X_Forwarded_Port);
+      baseURL.append(req.getServerName()).append(':').append(req.getHeader(X_Forwarded_Port));
     } else {
 //      Resort to request members
-      baseURL += req.getServerName() + ":" + req.getLocalPort();
+      baseURL.append(req.getServerName()).append(':').append(req.getLocalPort());
     }
 
 //    Handle Server context
     if( req.getHeader(X_Forwarded_Context) != null ) {
-      baseURL += req.getHeader( X_Forwarded_Context );
+      baseURL.append(req.getHeader( X_Forwarded_Context ));
     } else {
-      baseURL += req.getContextPath();
+      baseURL.append(req.getContextPath());
     }
 
-    return baseURL;
+    return baseURL.toString();
   }
 
   String buildURI(Topology topology, GatewayConfig config, HttpServletRequest req){
@@ -270,10 +270,7 @@ public class ServiceTestResource {
     }else{
       gatewayPath = "gateway";
     }
-    uri += "/" + gatewayPath;
-
-    uri += "/" + topology.getName();
-    return uri;
+    return uri + "/" + gatewayPath + "/" + topology.getName();
   }
 
   @XmlAccessorType(XmlAccessType.NONE)
@@ -340,7 +337,6 @@ public class ServiceTestResource {
     }
 
     public void setMessage(String msg) {
-
       if(httpCode != -1) {
         message = buildMessage(httpCode);
       } else {
@@ -353,38 +349,25 @@ public class ServiceTestResource {
     }
 
     static String buildMessage(int code) {
-
-      String message = "";
-
       switch (code) {
-
         case 200:
-          message += "Request sucessful.";
-          break;
+          return "Request successful.";
         case 400:
-          message += "Could not properly intepret HTTP request.";
-          break;
+          return "Could not properly interpret HTTP request.";
         case 401:
-          message += "User was not authorized. Try using credentials with access to all services. " +
-              "Ensure LDAP server is running.";
-          break;
+          return "User was not authorized. Try using credentials with access to all services. " +
+                     "Ensure LDAP server is running.";
         case 403:
-          message += "Access to this resource is forbidden. It seems we might have made a bad request.";
-          break;
+          return "Access to this resource is forbidden. It seems we might have made a bad request.";
         case 404:
-          message += "The page could not be found. Are the URLs for the topology services correct?";
-          break;
+          return "The page could not be found. Are the URLs for the topology services correct?";
         case 500:
-          message += "The server encountered an error. Are all of the cluster's services running? \n" +
+          return "The server encountered an error. Are all of the cluster's services running? \n" +
               "Can a connection be established without Knox?";
-          break;
-
+        default:
+          return "";
       }
-      return message;
-
     }
-
-
   }
 
   @XmlAccessorType(XmlAccessType.FIELD)
@@ -414,8 +397,5 @@ public class ServiceTestResource {
     public void setMessages(List<String> messages){
       this.messages = messages;
     }
-
   }
-
-
 }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/BasicResponse.java
----------------------------------------------------------------------
diff --git a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/BasicResponse.java b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/BasicResponse.java
index d7e3b50..49b16ee 100644
--- a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/BasicResponse.java
+++ b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/BasicResponse.java
@@ -28,7 +28,7 @@ import java.io.InputStream;
 public class BasicResponse implements Closeable {
 
   private HttpResponse response;
-  private boolean consumed = false;
+  private boolean consumed;
   private String string;
   private InputStream stream;
   private byte[] bytes;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/ErrorResponse.java
----------------------------------------------------------------------
diff --git a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/ErrorResponse.java b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/ErrorResponse.java
index 28a2e50..92661e9 100644
--- a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/ErrorResponse.java
+++ b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/ErrorResponse.java
@@ -24,7 +24,7 @@ class ErrorResponse extends RuntimeException {
   HttpResponse response;
 
   ErrorResponse( HttpResponse response ) {
-    super( "" + response.getStatusLine() );
+    super(String.valueOf(response.getStatusLine()));
     this.response = response;
   }
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxSession.java
----------------------------------------------------------------------
diff --git a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxSession.java b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxSession.java
index f475a42..e761450 100644
--- a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxSession.java
+++ b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxSession.java
@@ -56,13 +56,13 @@ import javax.security.auth.login.LoginContext;
 import javax.security.auth.login.LoginException;
 import java.io.Closeable;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
+import java.nio.file.Files;
 import java.security.GeneralSecurityException;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
@@ -91,7 +91,7 @@ public class KnoxSession implements Closeable {
   private static final String DEFAULT_JAAS_FILE = "/jaas.conf";
   public static final String JGSS_LOGIN_MOUDLE = "com.sun.security.jgss.initiate";
 
-  private boolean isKerberos = false;
+  private boolean isKerberos;
 
   String base;
   HttpHost host;
@@ -324,7 +324,7 @@ public class KnoxSession implements Closeable {
       }
 
       if (file.exists()) {
-        try (InputStream is = new FileInputStream(file)) {
+        try (InputStream is = Files.newInputStream(file.toPath())) {
           ks.load(is, truststorePass.toCharArray());
         }
       }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxSh.java
----------------------------------------------------------------------
diff --git a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxSh.java b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxSh.java
index fa8b727..07f213e 100644
--- a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxSh.java
+++ b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxSh.java
@@ -23,10 +23,10 @@ import org.apache.knox.gateway.util.JsonUtils;
 
 import java.io.BufferedReader;
 import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.io.OutputStream;
 import java.io.PrintStream;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
@@ -57,7 +57,7 @@ public class KnoxSh {
   public PrintStream err = System.err;
 
   private Command command;
-  private String gateway = null;
+  private String gateway;
 
   public int run(String[] args) throws Exception {
     int exitCode;
@@ -184,7 +184,7 @@ public class KnoxSh {
         displayTokenDetails(json);
 
         File tokenfile = new File(System.getProperty("user.home"), ".knoxtokencache");
-        try( FileOutputStream fos = new FileOutputStream(tokenfile) ) {
+        try( OutputStream fos = Files.newOutputStream(tokenfile.toPath()) ) {
           fos.write(text.getBytes(StandardCharsets.UTF_8));
           Set<PosixFilePermission> perms = new HashSet<>();
           //add owners permission only
@@ -273,7 +273,9 @@ public class KnoxSh {
   }
 
   private String readFile(String file) throws IOException {
-    try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8))) {
+    try (InputStream inputStream = Files.newInputStream(Paths.get(file));
+         InputStreamReader inputStreamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);
+         BufferedReader reader = new BufferedReader(inputStreamReader)) {
       String line;
       StringBuilder stringBuilder = new StringBuilder();
       String ls = System.getProperty("line.separator");
@@ -283,7 +285,7 @@ public class KnoxSh {
       }
       return stringBuilder.toString();
     }
-}
+  }
 
   /**
    * @param args command line arguments

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxTokenCredentialCollector.java
----------------------------------------------------------------------
diff --git a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxTokenCredentialCollector.java b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxTokenCredentialCollector.java
index 71fe605..a9607dc 100644
--- a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxTokenCredentialCollector.java
+++ b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/KnoxTokenCredentialCollector.java
@@ -35,9 +35,9 @@ public class KnoxTokenCredentialCollector extends AbstractCredentialCollector {
 
   private static final String KNOXTOKENCACHE = ".knoxtokencache";
 
-  private String targetUrl = null;
+  private String targetUrl;
 
-  private String tokenType = null;
+  private String tokenType;
 
   @Override
   public void collect() throws CredentialCollectionException {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hbase/table/row/DeleteRows.java
----------------------------------------------------------------------
diff --git a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hbase/table/row/DeleteRows.java b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hbase/table/row/DeleteRows.java
index ee8d7d1..58591a5 100644
--- a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hbase/table/row/DeleteRows.java
+++ b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hbase/table/row/DeleteRows.java
@@ -70,7 +70,7 @@ public class DeleteRows {
           if( column != null ) {
             columnsURIPart.append( column.toURIPart() );
           }
-          columnsURIPart.append( "/" );
+          columnsURIPart.append('/');
 
           String timeURIPart = "";
           if( time != null ) {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hbase/table/row/QueryRows.java
----------------------------------------------------------------------
diff --git a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hbase/table/row/QueryRows.java b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hbase/table/row/QueryRows.java
index 7686520..a272921 100644
--- a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hbase/table/row/QueryRows.java
+++ b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hbase/table/row/QueryRows.java
@@ -90,17 +90,17 @@ public class QueryRows {
           int index = 0;
           for( Column column : columns ) {
             if( index++ > 0 ) {
-              columnsURIPart.append( "," );
+              columnsURIPart.append(',');
             }
             columnsURIPart.append( column.toURIPart() );
           }
-          columnsURIPart.append( "/" );
+          columnsURIPart.append('/');
 
           StringBuilder timesURIPart = new StringBuilder();
           if( startTime != null && endTime != null ) {
-            timesURIPart.append( startTime ).append( "," ).append( endTime );
+            timesURIPart.append( startTime ).append(',').append( endTime );
           } else if( startTime != null ) {
-            timesURIPart.append( startTime ).append( "," ).append( Long.MAX_VALUE );
+            timesURIPart.append( startTime ).append(',').append( Long.MAX_VALUE );
           } else if( endTime != null ) {
             timesURIPart.append( endTime );
           }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hdfs/Mkdir.java
----------------------------------------------------------------------
diff --git a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hdfs/Mkdir.java b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hdfs/Mkdir.java
index d4aaab7..f927953 100644
--- a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hdfs/Mkdir.java
+++ b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hdfs/Mkdir.java
@@ -30,8 +30,8 @@ class Mkdir {
 
   public static class Request extends AbstractRequest<Response> {
 
-    String dir = null;
-    String perm = null;
+    String dir;
+    String perm;
 
     Request( KnoxSession session ) {
       super( session );

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hdfs/Put.java
----------------------------------------------------------------------
diff --git a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hdfs/Put.java b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hdfs/Put.java
index f48b40b..9d6e74e 100644
--- a/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hdfs/Put.java
+++ b/gateway-shell/src/main/java/org/apache/knox/gateway/shell/hdfs/Put.java
@@ -41,7 +41,7 @@ class Put {
     private String text;
     private String file;
     private String to;
-    private boolean overwrite = false;
+    private boolean overwrite;
     private int permission = 755;
     private Integer blocksize;
     private Integer buffersize;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-spi/src/main/java/org/apache/knox/gateway/dispatch/GatewayDispatchFilter.java
----------------------------------------------------------------------
diff --git a/gateway-spi/src/main/java/org/apache/knox/gateway/dispatch/GatewayDispatchFilter.java b/gateway-spi/src/main/java/org/apache/knox/gateway/dispatch/GatewayDispatchFilter.java
index 5f6611f..79442db 100644
--- a/gateway-spi/src/main/java/org/apache/knox/gateway/dispatch/GatewayDispatchFilter.java
+++ b/gateway-spi/src/main/java/org/apache/knox/gateway/dispatch/GatewayDispatchFilter.java
@@ -49,7 +49,7 @@ public class GatewayDispatchFilter extends AbstractGatewayFilter {
 
   private final Object lock = new Object();
 
-  private String whitelist = null;
+  private String whitelist;
 
   private Dispatch dispatch;
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-spi/src/main/java/org/apache/knox/gateway/dispatch/HadoopAuthCookieStore.java
----------------------------------------------------------------------
diff --git a/gateway-spi/src/main/java/org/apache/knox/gateway/dispatch/HadoopAuthCookieStore.java b/gateway-spi/src/main/java/org/apache/knox/gateway/dispatch/HadoopAuthCookieStore.java
index 64ca2f8..06c9967 100644
--- a/gateway-spi/src/main/java/org/apache/knox/gateway/dispatch/HadoopAuthCookieStore.java
+++ b/gateway-spi/src/main/java/org/apache/knox/gateway/dispatch/HadoopAuthCookieStore.java
@@ -17,10 +17,11 @@
  */
 package org.apache.knox.gateway.dispatch;
 
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.lang.reflect.Field;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.Date;
 import java.util.Properties;
 
@@ -38,7 +39,6 @@ public class HadoopAuthCookieStore extends BasicCookieStore {
 
   private GatewayConfig gatewayConfig;
 
-
   HadoopAuthCookieStore(GatewayConfig config) {
     this.gatewayConfig = config;
   }
@@ -55,7 +55,6 @@ public class HadoopAuthCookieStore extends BasicCookieStore {
     }
   }
 
-
   private static boolean isKnoxCookie(GatewayConfig config, Cookie cookie) {
     boolean result = false;
 
@@ -75,7 +74,7 @@ public class HadoopAuthCookieStore extends BasicCookieStore {
             String krb5Config = config.getKerberosLoginConfig();
             if (krb5Config != null && !krb5Config.isEmpty()) {
               Properties p = new Properties();
-              try (InputStream in = new FileInputStream(krb5Config)){
+              try (InputStream in = Files.newInputStream(Paths.get(krb5Config))){
                 p.load(in);
                 String configuredPrincipal = p.getProperty("principal");
                 // Strip off enclosing quotes, if present

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-spi/src/main/java/org/apache/knox/gateway/security/principal/SimplePrincipalMapper.java
----------------------------------------------------------------------
diff --git a/gateway-spi/src/main/java/org/apache/knox/gateway/security/principal/SimplePrincipalMapper.java b/gateway-spi/src/main/java/org/apache/knox/gateway/security/principal/SimplePrincipalMapper.java
index 94dcc8d..a5255a9 100644
--- a/gateway-spi/src/main/java/org/apache/knox/gateway/security/principal/SimplePrincipalMapper.java
+++ b/gateway-spi/src/main/java/org/apache/knox/gateway/security/principal/SimplePrincipalMapper.java
@@ -22,8 +22,8 @@ import java.util.HashMap;
 import java.util.StringTokenizer;
 
 public class SimplePrincipalMapper implements PrincipalMapper {
-  public HashMap<String, String[]> principalMappings = null;
-  public HashMap<String, String[]> groupMappings = null;
+  public HashMap<String, String[]> principalMappings;
+  public HashMap<String, String[]> groupMappings;
 
   public SimplePrincipalMapper() {
   }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/BaseKeystoreService.java
----------------------------------------------------------------------
diff --git a/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/BaseKeystoreService.java b/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/BaseKeystoreService.java
index ff4b851..d69b678 100644
--- a/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/BaseKeystoreService.java
+++ b/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/BaseKeystoreService.java
@@ -25,11 +25,11 @@ import org.apache.knox.gateway.services.security.MasterService;
 
 import javax.crypto.spec.SecretKeySpec;
 import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.OutputStream;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.security.Key;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
@@ -49,7 +49,7 @@ public class BaseKeystoreService {
       throws CertificateException, IOException, KeyStoreException, NoSuchAlgorithmException {
        final KeyStore  keyStore = KeyStore.getInstance(storeType);
        if ( keyStoreFile.exists() ) {
-           try (FileInputStream input = new FileInputStream( keyStoreFile )) {
+           try (InputStream input = Files.newInputStream(keyStoreFile.toPath())) {
                keyStore.load( input, masterPassword );
            }
        } else {
@@ -59,7 +59,7 @@ public class BaseKeystoreService {
        return keyStore;
       }
 
-  private static FileOutputStream createKeyStoreFile( String fileName ) throws IOException {
+  private static OutputStream createKeyStoreFile(String fileName ) throws IOException {
     File file = new File( fileName );
     if( file.exists() ) {
       if( file.isDirectory() ) {
@@ -75,11 +75,11 @@ public class BaseKeystoreService {
         }
       }
     }
-    return new FileOutputStream( file );
+    return Files.newOutputStream( file.toPath() );
   }
 
   protected void createKeystore(String filename, String keystoreType) throws KeystoreServiceException {
-    try (FileOutputStream out = createKeyStoreFile( filename )) {
+    try (OutputStream out = createKeyStoreFile( filename )) {
       KeyStore ks = KeyStore.getInstance(keystoreType);
       ks.load( null, null );
       ks.store( out, masterService.getMasterSecret() );
@@ -91,7 +91,7 @@ public class BaseKeystoreService {
 
   protected boolean isKeystoreAvailable(final File keyStoreFile, String storeType) throws KeyStoreException, IOException {
     if ( keyStoreFile.exists() ) {
-      try (InputStream input = new FileInputStream(keyStoreFile)){
+      try (InputStream input = Files.newInputStream(keyStoreFile.toPath())){
         final KeyStore keyStore = KeyStore.getInstance(storeType);
         keyStore.load( input, masterService.getMasterSecret() );
         return true;
@@ -157,7 +157,7 @@ public class BaseKeystoreService {
   protected void writeCertificateToFile( Certificate cert, final File file ) throws CertificateEncodingException, IOException {
     byte[] bytes = cert.getEncoded();
     Base64 encoder = new Base64( 76, "\n".getBytes( StandardCharsets.US_ASCII ) );
-    try( FileOutputStream out = new FileOutputStream( file ) ) {
+    try( OutputStream out = Files.newOutputStream( file.toPath() ) ) {
       out.write( "-----BEGIN CERTIFICATE-----\n".getBytes( StandardCharsets.US_ASCII ) );
       out.write( encoder.encodeToString( bytes ).getBytes( StandardCharsets.US_ASCII ) );
       out.write( "-----END CERTIFICATE-----\n".getBytes( StandardCharsets.US_ASCII ) );
@@ -167,7 +167,7 @@ public class BaseKeystoreService {
   protected void writeKeystoreToFile(final KeyStore keyStore, final File file)
       throws KeyStoreException, IOException, NoSuchAlgorithmException, CertificateException {
      // TODO: backup the keystore on disk before attempting a write and restore on failure
-     try( FileOutputStream out = new FileOutputStream(file) ) {
+     try( OutputStream out = Files.newOutputStream(file.toPath()) ) {
          keyStore.store( out, masterService.getMasterSecret() );
      }
   }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/CMFMasterService.java
----------------------------------------------------------------------
diff --git a/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/CMFMasterService.java b/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/CMFMasterService.java
index 961e7da..023583f 100644
--- a/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/CMFMasterService.java
+++ b/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/CMFMasterService.java
@@ -39,7 +39,7 @@ public class CMFMasterService {
 
   private static final String MASTER_PASSPHRASE = "masterpassphrase";
   private static final String MASTER_PERSISTENCE_TAG = "#1.0# " + TimeStamp.getCurrentTime().toDateString();
-  protected char[] master = null;
+  protected char[] master;
   protected String serviceName;
   private ConfigurableEncryptor encryptor = new ConfigurableEncryptor(MASTER_PASSPHRASE);
 

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/X509CertificateUtil.java
----------------------------------------------------------------------
diff --git a/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/X509CertificateUtil.java b/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/X509CertificateUtil.java
index 551fb5c..8e0a370 100644
--- a/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/X509CertificateUtil.java
+++ b/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/impl/X509CertificateUtil.java
@@ -18,14 +18,15 @@
 package org.apache.knox.gateway.services.security.impl;
 
 import java.io.File;
-import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.OutputStream;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.math.BigInteger;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.security.KeyPair;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
@@ -276,7 +277,7 @@ public class X509CertificateUtil {
        throws CertificateEncodingException, IOException {
     byte[] bytes = cert.getEncoded();
     Base64 encoder = new Base64( 76, "\n".getBytes( StandardCharsets.US_ASCII ) );
-    try( FileOutputStream out = new FileOutputStream( file ) ) {
+    try(OutputStream out = Files.newOutputStream(file.toPath()) ) {
       out.write( "-----BEGIN CERTIFICATE-----\n".getBytes( StandardCharsets.US_ASCII ) );
       out.write( encoder.encodeToString( bytes ).getBytes( StandardCharsets.US_ASCII ) );
       out.write( "-----END CERTIFICATE-----\n".getBytes( StandardCharsets.US_ASCII ) );
@@ -291,7 +292,7 @@ public class X509CertificateUtil {
     ks.load(null, password);
     ks.setCertificateEntry("gateway-identity", cert);
     /* Coverity Scan CID 1361992 */
-    try (FileOutputStream fos = new FileOutputStream(file)) {
+    try (OutputStream fos = Files.newOutputStream(file.toPath())) {
       ks.store(fos, password);
     }
   }

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-spi/src/main/java/org/apache/knox/gateway/topology/Service.java
----------------------------------------------------------------------
diff --git a/gateway-spi/src/main/java/org/apache/knox/gateway/topology/Service.java b/gateway-spi/src/main/java/org/apache/knox/gateway/topology/Service.java
index 6b0c5de..d65704c 100644
--- a/gateway-spi/src/main/java/org/apache/knox/gateway/topology/Service.java
+++ b/gateway-spi/src/main/java/org/apache/knox/gateway/topology/Service.java
@@ -34,7 +34,7 @@ public class Service {
   private Version version;
   private Map<String, String> params = new LinkedHashMap<>();
   private List<String> urls;
-  private CustomDispatch dispatch = null;
+  private CustomDispatch dispatch;
 
   public String getRole() {
     return role;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-spi/src/main/java/org/apache/knox/gateway/topology/Topology.java
----------------------------------------------------------------------
diff --git a/gateway-spi/src/main/java/org/apache/knox/gateway/topology/Topology.java b/gateway-spi/src/main/java/org/apache/knox/gateway/topology/Topology.java
index c84673f..10f891e 100644
--- a/gateway-spi/src/main/java/org/apache/knox/gateway/topology/Topology.java
+++ b/gateway-spi/src/main/java/org/apache/knox/gateway/topology/Topology.java
@@ -32,7 +32,7 @@ public class Topology {
 
   private URI uri;
   private String name;
-  private String defaultServicePath = null;
+  private String defaultServicePath;
   private long timestamp;
   private boolean isGenerated;
   public List<Provider> providerList = new ArrayList<>();
@@ -41,7 +41,7 @@ public class Topology {
   private MultiKeyMap serviceMap;
   private List<Application> applications = new ArrayList<>();
   private Map<String,Application> applicationMap = new HashMap<>();
-  private CustomDispatch dispatch = null;
+  private CustomDispatch dispatch;
 
   public Topology() {
     serviceMap = MultiKeyMap.decorate(new HashedMap());

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-spi/src/test/java/org/apache/knox/gateway/dispatch/GatewayDispatchFilterTest.java
----------------------------------------------------------------------
diff --git a/gateway-spi/src/test/java/org/apache/knox/gateway/dispatch/GatewayDispatchFilterTest.java b/gateway-spi/src/test/java/org/apache/knox/gateway/dispatch/GatewayDispatchFilterTest.java
index 6340182..8fc5183 100644
--- a/gateway-spi/src/test/java/org/apache/knox/gateway/dispatch/GatewayDispatchFilterTest.java
+++ b/gateway-spi/src/test/java/org/apache/knox/gateway/dispatch/GatewayDispatchFilterTest.java
@@ -270,7 +270,7 @@ public class GatewayDispatchFilterTest {
   }
 
   private static class TestHttpServletResponse extends MockHttpServletResponse {
-    int status = 0;
+    int status;
 
     @Override
     public void sendError(int i) throws IOException {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-spi/src/test/java/org/apache/knox/gateway/services/security/impl/CMFMasterServiceTest.java
----------------------------------------------------------------------
diff --git a/gateway-spi/src/test/java/org/apache/knox/gateway/services/security/impl/CMFMasterServiceTest.java b/gateway-spi/src/test/java/org/apache/knox/gateway/services/security/impl/CMFMasterServiceTest.java
index 82170ed..8c329f2 100644
--- a/gateway-spi/src/test/java/org/apache/knox/gateway/services/security/impl/CMFMasterServiceTest.java
+++ b/gateway-spi/src/test/java/org/apache/knox/gateway/services/security/impl/CMFMasterServiceTest.java
@@ -35,7 +35,7 @@ import static org.junit.Assert.fail;
 */
 @Category( { UnitTests.class, FastTests.class } )
 public class CMFMasterServiceTest {
-  TestCMFMasterService ms = null;
+  TestCMFMasterService ms;
 
   @Before
   public void setup() {

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-test-release-utils/src/main/java/org/apache/knox/gateway/GatewayTestConfig.java
----------------------------------------------------------------------
diff --git a/gateway-test-release-utils/src/main/java/org/apache/knox/gateway/GatewayTestConfig.java b/gateway-test-release-utils/src/main/java/org/apache/knox/gateway/GatewayTestConfig.java
index 1fb183a..ed89a2f 100644
--- a/gateway-test-release-utils/src/main/java/org/apache/knox/gateway/GatewayTestConfig.java
+++ b/gateway-test-release-utils/src/main/java/org/apache/knox/gateway/GatewayTestConfig.java
@@ -47,20 +47,20 @@ public class GatewayTestConfig extends Configuration implements GatewayConfig {
   private String gatewayHomeDir = "gateway-home";
   private String hadoopConfDir = "hadoop";
   private String gatewayHost = "localhost";
-  private int gatewayPort = 0;
+  private int gatewayPort;
   private String gatewayPath = "gateway";
-  private boolean hadoopKerberosSecured = false;
+  private boolean hadoopKerberosSecured;
   private String kerberosConfig = "/etc/knox/conf/krb5.conf";
-  private boolean kerberosDebugEnabled = false;
+  private boolean kerberosDebugEnabled;
   private String kerberosLoginConfig = "/etc/knox/conf/krb5JAASLogin.conf";
-  private String frontendUrl = null;
+  private String frontendUrl;
   private boolean xForwardedEnabled = true;
-  private String gatewayApplicationsDir = null;
+  private String gatewayApplicationsDir;
   private String gatewayServicesDir;
   private String defaultTopologyName = "default";
-  private List<String> includedSSLCiphers = null;
-  private List<String> excludedSSLCiphers = null;
-  private boolean sslEnabled = false;
+  private List<String> includedSSLCiphers;
+  private List<String> excludedSSLCiphers;
+  private boolean sslEnabled;
   private String truststoreType = "jks";
   private String keystoreType = "jks";
   private boolean isTopologyPortMappingEnabled = true;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-test-release-utils/src/main/java/org/apache/knox/gateway/GatewayTestDriver.java
----------------------------------------------------------------------
diff --git a/gateway-test-release-utils/src/main/java/org/apache/knox/gateway/GatewayTestDriver.java b/gateway-test-release-utils/src/main/java/org/apache/knox/gateway/GatewayTestDriver.java
index 03bbdad..ce5f846 100644
--- a/gateway-test-release-utils/src/main/java/org/apache/knox/gateway/GatewayTestDriver.java
+++ b/gateway-test-release-utils/src/main/java/org/apache/knox/gateway/GatewayTestDriver.java
@@ -21,9 +21,9 @@ import static org.junit.Assert.assertThat;
 import static org.junit.Assert.fail;
 
 import java.io.File;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.OutputStream;
 import java.net.InetAddress;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -31,6 +31,7 @@ import java.net.URL;
 import java.net.UnknownHostException;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.FileSystems;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.HashMap;
 import java.util.Map;
@@ -145,9 +146,9 @@ public class GatewayTestDriver {
     deployDir.mkdirs();
 
     File descriptor = new File( topoDir, cluster + ".xml" );
-    FileOutputStream stream = new FileOutputStream( descriptor );
-    topology.toStream( stream );
-    stream.close();
+    try(OutputStream stream = Files.newOutputStream(descriptor.toPath())) {
+        topology.toStream( stream );
+    }
 
     this.srvcs = new DefaultGatewayServices();
     Map<String,String> options = new HashMap<>();

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-test-utils/src/main/java/org/apache/knox/test/mock/MockRequestMatcher.java
----------------------------------------------------------------------
diff --git a/gateway-test-utils/src/main/java/org/apache/knox/test/mock/MockRequestMatcher.java b/gateway-test-utils/src/main/java/org/apache/knox/test/mock/MockRequestMatcher.java
index fc1246a..152e057 100644
--- a/gateway-test-utils/src/main/java/org/apache/knox/test/mock/MockRequestMatcher.java
+++ b/gateway-test-utils/src/main/java/org/apache/knox/test/mock/MockRequestMatcher.java
@@ -54,18 +54,18 @@ public class MockRequestMatcher {
 
   private String from;
   private MockResponseProvider response;
-  private Set<String> methods = null;
-  private String pathInfo = null;
-  private String requestURL = null;
-  Map<String,Matcher> headers = null;
-  Set<Cookie> cookies = null;
-  private Map<String,Object> attributes = null;
-  private Map<String,String> queryParams = null;
-  private String contentType = null;
-  private String characterEncoding = null;
-  private Integer contentLength = null;
-  private byte[] entity = null;
-  private Map<String,String[]> formParams = null;
+  private Set<String> methods;
+  private String pathInfo;
+  private String requestURL;
+  Map<String,Matcher> headers;
+  Set<Cookie> cookies;
+  private Map<String,Object> attributes;
+  private Map<String,String> queryParams;
+  private String contentType;
+  private String characterEncoding;
+  private Integer contentLength;
+  private byte[] entity;
+  private Map<String,String[]> formParams;
 
   public MockRequestMatcher( MockResponseProvider response ) {
     this.response = response;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-test-utils/src/main/java/org/apache/knox/test/mock/MockResponseProvider.java
----------------------------------------------------------------------
diff --git a/gateway-test-utils/src/main/java/org/apache/knox/test/mock/MockResponseProvider.java b/gateway-test-utils/src/main/java/org/apache/knox/test/mock/MockResponseProvider.java
index 9dabded..1d5831a 100644
--- a/gateway-test-utils/src/main/java/org/apache/knox/test/mock/MockResponseProvider.java
+++ b/gateway-test-utils/src/main/java/org/apache/knox/test/mock/MockResponseProvider.java
@@ -33,16 +33,16 @@ import java.util.Set;
 
 public class MockResponseProvider {
 
-  Integer errorCode = null;
-  String errorMsg = null;
-  Integer statusCode = null;
-  String redirectUrl = null;
-  Map<String,String> headers = null;
-  Set<Cookie> cookies = null;
-  byte[] entity = null;
-  String contentType = null;
-  String characterEncoding = null;
-  Integer contentLength = null;
+  Integer errorCode;
+  String errorMsg;
+  Integer statusCode;
+  String redirectUrl;
+  Map<String,String> headers;
+  Set<Cookie> cookies;
+  byte[] entity;
+  String contentType;
+  String characterEncoding;
+  Integer contentLength;
 
   public MockResponseProvider status( int statusCode ) {
     this.statusCode = statusCode;

http://git-wip-us.apache.org/repos/asf/knox/blob/6a35473a/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/api/AuditServiceFactory.java
----------------------------------------------------------------------
diff --git a/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/api/AuditServiceFactory.java b/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/api/AuditServiceFactory.java
index 8f4d0a1..77e8f7b 100644
--- a/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/api/AuditServiceFactory.java
+++ b/gateway-util-common/src/main/java/org/apache/knox/gateway/audit/api/AuditServiceFactory.java
@@ -22,7 +22,7 @@ import org.apache.knox.gateway.audit.log4j.audit.Log4jAuditService;
 public abstract class AuditServiceFactory {
 
   // The global audit service instance.
-  private static AuditService auditService = null;
+  private static AuditService auditService;
 
   // To prevent instantiation.
   private AuditServiceFactory() {