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https://issues.apache.org/jira/browse/MNG-6506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16802104#comment-16802104
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Hudson commented on MNG-6506:
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Build succeeded in Jenkins: Maven TLP » maven » runITsWithJavaEA #25
See https://builds.apache.org/job/maven-box/job/maven/job/runITsWithJavaEA/25/
> Mojos are unable to load package annotations on Java >= 9
> ---------------------------------------------------------
>
> Key: MNG-6506
> URL: https://issues.apache.org/jira/browse/MNG-6506
> Project: Maven
> Issue Type: Bug
> Components: Class Loading
> Affects Versions: 3.6.0
> Reporter: Andreas Veithen
> Assignee: Sylwester Lachiewicz
> Priority: Major
> Labels: up-for-grabs
> Fix For: 3.6.1
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> On Java 9 and above, calls to {{java.lang.Package.getAnnotation(Class)}} from
> within a Mojo always return {{null}} (unless the {{package-info}} class has
> been loaded by some other means before).
> The reason appears to be an incompatibility between Java 9 and Plexus
> Classworlds:
> * Java 9 ultimately calls {{findClass}} (instead of {{loadClass}}) to get the
> {{package-info}} class.
> * The {{findClass}} implementation in {{ClassRealm}} always throws
> {{ClassNotFoundException}}:
> https://github.com/codehaus-plexus/plexus-classworlds/blob/master/src/main/java/org/codehaus/plexus/classworlds/realm/ClassRealm.java#L275.
> This in particular affects plugins that interact with the JAXB API because it
> relies on package annotations.
> A workaround is to preload the required {{package-info}} classes using
> {{loadClass}}; see e.g. http://svn.apache.org/viewvc?rev=1845026&view=rev.
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