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https://issues.apache.org/jira/browse/MNG-5868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17070146#comment-17070146
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Hudson commented on MNG-5868:
-----------------------------
Build succeeded in Jenkins: Maven TLP » maven » MNG-5868 #51
See https://builds.apache.org/job/maven-box/job/maven/job/MNG-5868/51/
> Adding serval times the same artifact via MavenProjectHelper (attachArtifact)
> does not produce a failure
> ---------------------------------------------------------------------------------------------------------
>
> Key: MNG-5868
> URL: https://issues.apache.org/jira/browse/MNG-5868
> Project: Maven
> Issue Type: Bug
> Components: core
> Affects Versions: 3.2.3
> Reporter: Karl Heinz Marbaise
> Assignee: Karl Heinz Marbaise
> Priority: Major
> Fix For: 3.7.0-candidate
>
>
> During the check of an issue MSHADE-195 i stumbled over several things...
> If you take a look here and the log output excerpt:
> {noformat}
> INFO] Minimized 2341 -> 1293
> [INFO] Minimized 3282 -> 2234
> [INFO] Replacing original artifact with shaded artifact.
> [INFO] Replacing
> /Users/kama/ws-git/apache/mshade/mshade-195/target/MSHADE-195-example-1-SNAPSHOT.jar
> with
> /Users/kama/ws-git/apache/mshade/mshade-195/target/MSHADE-195-example-1-SNAPSHOT-shaded.jar
> [INFO] Replacing original source artifact with shaded source artifact.
> [INFO] Replacing
> /Users/kama/ws-git/apache/mshade/mshade-195/target/MSHADE-195-example-1-SNAPSHOT-sources.jar
> with
> /Users/kama/ws-git/apache/mshade/mshade-195/target/MSHADE-195-example-1-SNAPSHOT-shaded-sources.jar
> [INFO] Dependency-reduced POM written at:
> /Users/kama/ws-git/apache/mshade/mshade-195/dependency-reduced-pom.xml
> [INFO]
> [INFO] --- maven-install-plugin:2.5.2:install (default-install) @
> MSHADE-195-example ---
> [INFO] Installing
> /Users/kama/ws-git/apache/mshade/mshade-195/target/MSHADE-195-example-1-SNAPSHOT.jar
> to
> /Users/kama/.m2/repository/com/example/MSHADE-195-example/1-SNAPSHOT/MSHADE-195-example-1-SNAPSHOT.jar
> [INFO] Installing
> /Users/kama/ws-git/apache/mshade/mshade-195/dependency-reduced-pom.xml to
> /Users/kama/.m2/repository/com/example/MSHADE-195-example/1-SNAPSHOT/MSHADE-195-example-1-SNAPSHOT.pom
> [INFO] Installing
> /Users/kama/ws-git/apache/mshade/mshade-195/target/MSHADE-195-example-1-SNAPSHOT-sources.jar
> to
> /Users/kama/.m2/repository/com/example/MSHADE-195-example/1-SNAPSHOT/MSHADE-195-example-1-SNAPSHOT-sources.jar
> [INFO] Installing
> /Users/kama/ws-git/apache/mshade/mshade-195/target/MSHADE-195-example-1-SNAPSHOT-sources.jar
> to
> /Users/kama/.m2/repository/com/example/MSHADE-195-example/1-SNAPSHOT/MSHADE-195-example-1-SNAPSHOT-sources.jar
> [INFO]
> {noformat}
> Install plugin tries to install two identical artifacts which will work for
> maven-install-plugin but would fail a deploy to repository manager (for
> releases) etc.
> So after diving into the problem i found the following code in maven-core
> (MavenProject.java):
> {code:java}
> /**
> * 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.
> *
> * @param artifact the artifact to add or replace.
> * @throws DuplicateArtifactAttachmentException
> */
> public void addAttachedArtifact( Artifact artifact )
> throws DuplicateArtifactAttachmentException
> {
> getAttachedArtifacts().add( artifact );
> }
> public List<Artifact> getAttachedArtifacts()
> {
> if ( attachedArtifacts == null )
> {
> attachedArtifacts = new ArrayList<>();
> }
> return attachedArtifacts;
> }
> {code}
> So taking a look into MavenProjectHelper.java and the implementation
> (DefaultMavenProjectHelper.java).
> {code:java}
> /**
> * 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 )
> {
> project.addAttachedArtifact( artifact );
> }
> {code}
> which means that there is not check if an artifacts is already attached.
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