[MNG-5868] Adding serval times the same artifact via MavenProjectHelper 
(attachArtifact) does not produce a failure

o Updated to restore the behaviour consensus had been reached in MNG-5387.
o Kept 'MavenProject.getAttachedArtifacts' to return an unmodifiable list.
o Updated to log an information message when an existing artifact got replaced.


Project: http://git-wip-us.apache.org/repos/asf/maven/repo
Commit: http://git-wip-us.apache.org/repos/asf/maven/commit/3b12cd67
Tree: http://git-wip-us.apache.org/repos/asf/maven/tree/3b12cd67
Diff: http://git-wip-us.apache.org/repos/asf/maven/diff/3b12cd67

Branch: refs/heads/MNG-5868
Commit: 3b12cd67c7be869cc15c51e2977f7b8f9235eedf
Parents: cd34b08
Author: Christian Schulte <schu...@apache.org>
Authored: Thu Dec 17 22:43:47 2015 +0100
Committer: Karl Heinz Marbaise <khmarba...@apache.org>
Committed: Sat Feb 17 21:36:53 2018 +0100

----------------------------------------------------------------------
 .../project/DefaultMavenProjectHelper.java      | 13 +++----
 .../org/apache/maven/project/MavenProject.java  | 39 +++++++++++++++-----
 2 files changed, 35 insertions(+), 17 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/maven/blob/3b12cd67/maven-core/src/main/java/org/apache/maven/project/DefaultMavenProjectHelper.java
----------------------------------------------------------------------
diff --git 
a/maven-core/src/main/java/org/apache/maven/project/DefaultMavenProjectHelper.java
 
b/maven-core/src/main/java/org/apache/maven/project/DefaultMavenProjectHelper.java
index 1972242..d65aa73 100644
--- 
a/maven-core/src/main/java/org/apache/maven/project/DefaultMavenProjectHelper.java
+++ 
b/maven-core/src/main/java/org/apache/maven/project/DefaultMavenProjectHelper.java
@@ -94,16 +94,15 @@ public class DefaultMavenProjectHelper
         attachArtifact( project, artifact );
     }
 
-    /**
-     * Add an attached artifact or replace the file for an existing artifact.
-     *
-     * @see 
MavenProject#addAttachedArtifact(org.apache.maven.artifact.Artifact)
-     * @param project project reference.
-     * @param artifact artifact to add or replace.
-     */
     public void attachArtifact( MavenProject project, Artifact artifact )
     {
+        final int size = project.getAttachedArtifacts().size();
         project.addAttachedArtifact( artifact );
+
+        if ( project.getAttachedArtifacts().size() == size && 
this.getLogger().isInfoEnabled() )
+        {
+            this.getLogger().info( String.format( "Replaced artifact %s.", 
artifact ) );
+        }
     }
 
     public void addResource( MavenProject project, String resourceDirectory, 
List<String> includes,

http://git-wip-us.apache.org/repos/asf/maven/blob/3b12cd67/maven-core/src/main/java/org/apache/maven/project/MavenProject.java
----------------------------------------------------------------------
diff --git 
a/maven-core/src/main/java/org/apache/maven/project/MavenProject.java 
b/maven-core/src/main/java/org/apache/maven/project/MavenProject.java
index 80a5193..ba153a7 100644
--- a/maven-core/src/main/java/org/apache/maven/project/MavenProject.java
+++ b/maven-core/src/main/java/org/apache/maven/project/MavenProject.java
@@ -909,19 +909,38 @@ public class MavenProject
     }
 
     /**
-     * Add or replace an artifact. This method is now deprecated. Use the 
@{MavenProjectHelper} to attach artifacts to a
-     * project. In spite of the 'throws' declaration on this API, this method 
has never thrown an exception since Maven
-     * 3.0.x. Historically, it logged and ignored a second addition of the 
same g/a/v/c/t. Now it replaces the file for
-     * the artifact, so that plugins (e.g. shade) can change the pathname of 
the file for a particular set of
-     * coordinates.
+     * Adds or replaces an artifact.
      *
-     * @param artifact the artifact to add or replace.
-     * @throws DuplicateArtifactAttachmentException
+     * @param artifact The artifact to add or replace.
+     *
+     * @deprecated Please use {@link MavenProjectHelper}
+     * @see https://issues.apache.org/jira/browse/MNG-5868
+     * @see https://issues.apache.org/jira/browse/MNG-5387
+     * @see https://issues.apache.org/jira/browse/MNG-4013
+     * @see https://issues.apache.org/jira/browse/MNG-3119
      */
+    @Deprecated
     public void addAttachedArtifact( Artifact artifact )
-        throws DuplicateArtifactAttachmentException
     {
-        getAttachedArtifacts().add( artifact );
+        getAttachedArtifacts();
+        assert this.attachedArtifacts != null : "Unexpected missing attached 
artifacts.";
+
+        boolean replaced = false;
+        for ( int i = 0, s0 = this.attachedArtifacts.size(); i < s0; i++ )
+        {
+            final Artifact a = this.attachedArtifacts.get( i );
+
+            if ( a.equals( artifact ) )
+            {
+                this.attachedArtifacts.set( i, artifact );
+                replaced = true;
+            }
+        }
+
+        if ( !replaced )
+        {
+            this.attachedArtifacts.add( artifact );
+        }
     }
 
     public List<Artifact> getAttachedArtifacts()
@@ -930,7 +949,7 @@ public class MavenProject
         {
             attachedArtifacts = new ArrayList<>();
         }
-        return attachedArtifacts;
+        return Collections.unmodifiableList( attachedArtifacts );
     }
 
     public Xpp3Dom getGoalConfiguration( String pluginGroupId, String 
pluginArtifactId, String executionId,

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