fixed errors reported by Checkstyle
diff --git a/maven-aether-provider/src/main/java/org/apache/maven/repository/internal/DefaultModelResolver.java b/maven-aether-provider/src/main/java/org/apache/maven/repository/internal/DefaultModelResolver.java
index e97ac29..8335e01 100644
--- a/maven-aether-provider/src/main/java/org/apache/maven/repository/internal/DefaultModelResolver.java
+++ b/maven-aether-provider/src/main/java/org/apache/maven/repository/internal/DefaultModelResolver.java
@@ -88,8 +88,8 @@
         this.remoteRepositoryManager = remoteRepositoryManager;
         this.repositories = repositories;
         List<RemoteRepository> externalRepositories = new ArrayList<RemoteRepository>();
-        externalRepositories.addAll(repositories);
-        this.externalRepositories = Collections.unmodifiableList(externalRepositories);
+        externalRepositories.addAll( repositories );
+        this.externalRepositories = Collections.unmodifiableList( externalRepositories );
 
         this.repositoryIds = new HashSet<String>();
     }
@@ -128,7 +128,7 @@
     {
         this.repositoryIds.clear();
         this.repositories.clear();
-        this.repositories.addAll(externalRepositories);
+        this.repositories.addAll( externalRepositories );
     }
 
     @Override
diff --git a/maven-core/src/main/java/org/apache/maven/DefaultMaven.java b/maven-core/src/main/java/org/apache/maven/DefaultMaven.java
index 06d61aa..af0defd 100644
--- a/maven-core/src/main/java/org/apache/maven/DefaultMaven.java
+++ b/maven-core/src/main/java/org/apache/maven/DefaultMaven.java
@@ -22,7 +22,6 @@
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
-import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -35,7 +34,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
-import java.util.TimeZone;
 
 import org.apache.maven.artifact.ArtifactUtils;
 import org.apache.maven.artifact.handler.manager.ArtifactHandlerManager;
@@ -55,7 +53,6 @@
 import org.apache.maven.model.building.ModelProblemUtils;
 import org.apache.maven.model.building.ModelSource;
 import org.apache.maven.model.building.UrlModelSource;
-import org.apache.maven.model.interpolation.MavenBuildTimestamp;
 import org.apache.maven.plugin.LegacySupport;
 import org.apache.maven.project.MavenProject;
 import org.apache.maven.project.ProjectBuilder;
diff --git a/maven-core/src/main/java/org/apache/maven/SessionModule.java b/maven-core/src/main/java/org/apache/maven/SessionModule.java
index 5f6d301..c3438c6 100644
--- a/maven-core/src/main/java/org/apache/maven/SessionModule.java
+++ b/maven-core/src/main/java/org/apache/maven/SessionModule.java
@@ -33,7 +33,7 @@
     {
         SessionScope scope = new SessionScope();
         bindScope( SessionScoped.class, scope );
-        bind( SessionScope.class).toInstance( scope );
+        bind( SessionScope.class ).toInstance( scope );
         bind( MavenSession.class ).toProvider( SessionScope.<MavenSession> seededKeyProvider() ).in( scope );
     }
 }
diff --git a/maven-embedder/src/main/java/org/apache/maven/cli/CLIReportingUtils.java b/maven-embedder/src/main/java/org/apache/maven/cli/CLIReportingUtils.java
index 8d06cd6..6176f24 100644
--- a/maven-embedder/src/main/java/org/apache/maven/cli/CLIReportingUtils.java
+++ b/maven-embedder/src/main/java/org/apache/maven/cli/CLIReportingUtils.java
@@ -155,8 +155,10 @@
         int offset = tz.getRawOffset();
 
         // Raw offset ignores DST, so check if we are in DST now and add the offset
-        if( tz.inDaylightTime( new Date( timestamp ) ) )
-        	offset += tz.getDSTSavings();
+        if ( tz.inDaylightTime( new Date( timestamp ) ) )
+        {
+            offset += tz.getDSTSavings();
+        }
 
         long m = Math.abs( ( offset / ONE_MINUTE ) % 60 );
         long h = Math.abs( ( offset / ONE_HOUR ) % 24 );
diff --git a/maven-model-builder/src/main/java/org/apache/maven/model/building/DefaultModelBuilder.java b/maven-model-builder/src/main/java/org/apache/maven/model/building/DefaultModelBuilder.java
index 632c932..52c9fc3 100644
--- a/maven-model-builder/src/main/java/org/apache/maven/model/building/DefaultModelBuilder.java
+++ b/maven-model-builder/src/main/java/org/apache/maven/model/building/DefaultModelBuilder.java
@@ -591,7 +591,7 @@
 
         List<Repository> repositories = model.getRepositories();
 
-        if (resetRepositories)
+        if ( resetRepositories )
         {
             modelResolver.resetRepositories();
         }
diff --git a/maven-model-builder/src/main/java/org/apache/maven/model/profile/activation/ProfileActivator.java b/maven-model-builder/src/main/java/org/apache/maven/model/profile/activation/ProfileActivator.java
index 7094a3f..57487d4 100644
--- a/maven-model-builder/src/main/java/org/apache/maven/model/profile/activation/ProfileActivator.java
+++ b/maven-model-builder/src/main/java/org/apache/maven/model/profile/activation/ProfileActivator.java
@@ -44,8 +44,8 @@
     boolean isActive( Profile profile, ProfileActivationContext context, ModelProblemCollector problems );
 
     /**
-     * Determines whether specified activation method is present in configuration or not. It should help to have AND between
-     * activation conditions
+     * Determines whether specified activation method is present in configuration or not. It should help to have AND
+     * between activation conditions
      * Need for solving http://jira.codehaus.org/browse/MNG-4565
      * @param profile The profile whose activation status should be determined, must not be {@code null}.
      * @param context The environmental context used to determine the activation status of the profile, must not be