Bug#808691: jboss-xnio: FTBFS: duplicate class: org.xnio._private.Messages_$logger

[Markus Koschany]

I think jboss-xnio and undertow are only affected by this issue and
presumably maven-compiler-plugin is to blame here.

I have found this upstream bug report

https://issues.apache.org/jira/browse/MCOMPILER-235

which seems related. I can work around the FTBFS by disabling the
annotation processing and passing -proc:none as an argument to the
compiler plugin. However this isn't really a proper fix because those
generated classes are then not part of the final jar file and this may
cause several other issues.

The upstream bug report claims that maven-compiler-plugin 3.1 works or
explicitly setting useIncrementalCompilation to false. Not sure if this
might help us. At the moment I don't see a way to fix this in jboss-xnio
or undertow though.

Markus

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