Andreas Veithen created MNG-6506:
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Summary: 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
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/sonatype/plexus-classworlds/blob/plexus-classworlds-2.5.2/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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