diff --git a/maven-core/src/main/java/org/apache/maven/lifecycle/internal/MojoDescriptorCreator.java b/maven-core/src/main/java/org/apache/maven/lifecycle/internal/MojoDescriptorCreator.java
index e0647af17e..053d85163e 100644
--- a/maven-core/src/main/java/org/apache/maven/lifecycle/internal/MojoDescriptorCreator.java
+++ b/maven-core/src/main/java/org/apache/maven/lifecycle/internal/MojoDescriptorCreator.java
@@ -229,7 +229,7 @@ else if ( numTokens == 3 )
             resolvePluginVersion( plugin, session, project );
         }
 
-        return pluginManager.getMojoDescriptor( plugin, goal, project.getRemotePluginRepositories(),
+        return pluginManager.getMojoDescriptor( plugin, goal.toString(), project.getRemotePluginRepositories(),
                                                 session.getRepositorySession() );
     }
 
diff --git a/maven-core/src/main/java/org/apache/maven/plugin/prefix/NoPluginFoundForPrefixException.java b/maven-core/src/main/java/org/apache/maven/plugin/prefix/NoPluginFoundForPrefixException.java
index 6612913522..de53d51e6b 100644
--- a/maven-core/src/main/java/org/apache/maven/plugin/prefix/NoPluginFoundForPrefixException.java
+++ b/maven-core/src/main/java/org/apache/maven/plugin/prefix/NoPluginFoundForPrefixException.java
@@ -40,29 +40,29 @@ public NoPluginFoundForPrefixException( String prefix, List<String> pluginGroups
 
     private static String format( LocalRepository localRepository, List<RemoteRepository> remoteRepositories )
     {
-        String repos = "[";
+        StringBuilder repos = new StringBuilder( "[" );
 
         if ( localRepository != null )
         {
-            repos += localRepository.getId() + " (" + localRepository.getBasedir() + ")";
+            repos.append( localRepository.getId() ).append( " (" ).append( localRepository.getBasedir() ).append( ")" );
         }
 
         if ( remoteRepositories != null && !remoteRepositories.isEmpty() )
         {
             for ( RemoteRepository repository : remoteRepositories )
             {
-                repos += ", ";
+                repos.append( ", " );
 
                 if ( repository != null )
                 {
-                    repos += repository.getId() + " (" + repository.getUrl() + ")";
+                    repos.append( repository.getId() ).append( " (" ).append( repository.getUrl() ).append( ")" );
                 }
             }
         }
 
-        repos += "]";
+        repos.append( "]" );
 
-        return repos;
+        return repos.toString();
     }
 
 }
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 a45fa2c26b..565c934c6c 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
@@ -1556,13 +1556,15 @@ private DependencyManagement loadDependencyManagement( Model model, ModelBuildin
 
         if ( importIds.contains( imported ) )
         {
-            String message = "The dependencies of type=pom and with scope=import form a cycle: ";
+            StringBuilder message =
+                    new StringBuilder( "The dependencies of type=pom and with scope=import form a cycle: " );
             for ( String modelId : importIds )
             {
-                message += modelId + " -> ";
+                message.append( modelId ).append( " -> " );
             }
-            message += imported;
-            problems.add( new ModelProblemCollectorRequest( Severity.ERROR, Version.BASE ).setMessage( message ) );
+            message.append( imported );
+            problems.add( new ModelProblemCollectorRequest( Severity.ERROR, Version.BASE ).setMessage(
+                    message.toString() ) );
 
             return null;
         }