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http://jira.codehaus.org/browse/MNG-4013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=162849#action_162849
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Brian Fox commented on MNG-4013:
--------------------------------
Seems to be ignoring the classifier during the comparison (illegal attachment
is the tests jar)
> DuplicateArtifactAttachmentException On Building Test Jar
> ---------------------------------------------------------
>
> Key: MNG-4013
> URL: http://jira.codehaus.org/browse/MNG-4013
> Project: Maven 2
> Issue Type: Bug
> Affects Versions: 3.0-alpha-2
> Reporter: Shane Isbell
>
> I see this problem when building nexus-proxy. This is due to maven-jar-plugin
> Caused by: org.apache.maven.project.DuplicateArtifactAttachmentException:
> Duplicate artifact attachment detected. (project:
> org.sonatype.nexus:nexus-proxy:jar:1.3.0-SNAPSHOT; illegal attachment:
> org.sonatype.nexus:nexus-proxy:jar:tests:1.3.0-SNAPSHOT)
> at
> org.apache.maven.project.MavenProject.addAttachedArtifact(MavenProject.java:1440)
> at
> org.apache.maven.project.DefaultMavenProjectHelper.attachArtifact(DefaultMavenProjectHelper.java:102)
> at
> org.apache.maven.project.DefaultMavenProjectHelper.attachArtifact(DefaultMavenProjectHelper.java:70)
> at
> org.apache.maven.plugin.jar.AbstractJarMojo.execute(AbstractJarMojo.java:179)
> at
> org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:629)
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