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From "Andreas Veithen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MNG-6506) Mojos are unable to load package annotations on Java >= 9
Date Sun, 04 Nov 2018 15:01:00 GMT
Andreas Veithen created MNG-6506:
------------------------------------

             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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