o Polished error reporting

git-svn-id: https://svn.apache.org/repos/asf/maven/components/trunk@800482 13f79535-47bb-0310-9956-ffa450edef68

maven-core/src/main/java/org/apache/maven/DefaultMaven.java

@@ -38,6 +38,7 @@ import org.apache.maven.execution.MavenSession;
 import org.apache.maven.execution.ProjectDependencyGraph;
 import org.apache.maven.execution.ProjectSorter;
 import org.apache.maven.lifecycle.LifecycleExecutor;
+import org.apache.maven.model.building.ModelProblem;
 import org.apache.maven.project.MavenProject;
 import org.apache.maven.project.ProjectBuilder;
 import org.apache.maven.project.ProjectBuildingException;
@@ -293,6 +294,27 @@ public class DefaultMaven
         for ( ProjectBuildingResult result : results )
         {
             projects.add( result.getProject() );
+
+            if ( !result.getProblems().isEmpty() && logger.isWarnEnabled() )
+            {
+                logger.warn( "" );
+                logger.warn( "Some problems were encountered while building the effective model for "
+                    + result.getProject().getId() );
+                logger.warn( "" );
+
+                for ( ModelProblem problem : result.getProblems() )
+                {
+                    logger.warn( problem.getMessage() + " @ " + problem.getSource() );
+                }
+
+                logger.warn( "" );
+                logger.warn( "It is highly recommended to fix these problems"
+                    + " because they threaten the stability of your build." );
+                logger.warn( "" );
+                logger.warn( "For this reason, future Maven versions will no"
+                    + " longer support building such malformed projects." );
+                logger.warn( "" );
+            }
         }
     }
 

maven-core/src/main/java/org/apache/maven/lifecycle/DefaultLifecycleExecutor.java

@@ -1115,7 +1115,7 @@ public class DefaultLifecycleExecutor
             }
             catch ( PluginNotFoundException e )
             {
-                throw new LifecycleExecutionException( "Error resolving version for plugin " + plugin, e );
+                throw new LifecycleExecutionException( "Error resolving version for plugin " + plugin.getKey(), e );
             }
         }
 

maven-core/src/main/java/org/apache/maven/project/ProjectBuildingException.java

@@ -315,8 +315,12 @@ public class ProjectBuildingException
         {
             for ( ModelProblem problem : result.getProblems() )
             {
-                writer.print( "o " );
+                writer.print( "[" );
-                writer.println( problem.getMessage() );
+                writer.print( problem.getSeverity() );
+                writer.print( "] " );
+                writer.print( problem.getMessage() );
+                writer.print( " @ " );
+                writer.println( problem.getSource() );
             }
         }
         writer.close();

maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java

@@ -185,7 +185,10 @@ public class MavenCli
             {
                 System.out.println( es.getMessage() );
 
-                es.getException().printStackTrace();
+                if ( showErrors )
+                {
+                    es.getException().printStackTrace();
+                }
             }
 
             if ( MavenExecutionRequest.REACTOR_FAIL_NEVER.equals( request.getReactorFailureBehavior() ) )

maven-model-builder/src/main/java/org/apache/maven/model/building/DefaultModelBuilder.java

@@ -510,9 +510,9 @@ public class DefaultModelBuilder
         catch ( UnresolvableModelException e )
         {
             problems.add( new ModelProblem( "Non-resolvable parent POM "
-                + ModelProblemUtils.toId( groupId, artifactId, version ) + " for POM "
+                + ModelProblemUtils.toId( groupId, artifactId, version ) + ": " + e.getMessage(),
-                + ModelProblemUtils.toSourceHint( childModel ) + ": " + e.getMessage(), ModelProblem.Severity.FATAL,
+                                            ModelProblem.Severity.FATAL, ModelProblemUtils.toSourceHint( childModel ),
-                                            ModelProblemUtils.toSourceHint( childModel ), e ) );
+                                            e ) );
             throw new ModelBuildingException( problems.getProblems() );
         }
 

maven-model-builder/src/main/java/org/apache/maven/model/building/ModelBuildingException.java

@@ -75,8 +75,12 @@ public class ModelBuildingException
 
         for ( ModelProblem problem : problems )
         {
-            writer.print( "o " );
+            writer.print( "[" );
-            writer.println( problem.getMessage() );
+            writer.print( problem.getSeverity() );
+            writer.print( "] " );
+            writer.print( problem.getMessage() );
+            writer.print( " @ " );
+            writer.println( problem.getSource() );
         }
 
         return buffer.toString();