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https://issues.apache.org/jira/browse/MCOMPILER-361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16605328#comment-16605328
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Charles Oliver Nutter commented on MCOMPILER-361:
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Ok, so the missing bit may simply be that when producing a multi-release jar,
you must also set a property in the MANIFEST.MF file.
See discussion here: [https://twitter.com/rfscholte/status/1037578869681926144]
This does appear to get past the compile phase in the dependent project, but
then the javadoc plugin fails to recognize the "mrjar" module.
So the remaining issue here is whether the compiler or jar plugins should be
"smartened up" so that using "multiReleaseOutput" actually does *all* the steps
necessary to produce an actually-useful multi-release jar.
> module-info in multi-release jar is not picked up by compile
> ------------------------------------------------------------
>
> Key: MCOMPILER-361
> URL: https://issues.apache.org/jira/browse/MCOMPILER-361
> Project: Maven Compiler Plugin
> Issue Type: Bug
> Affects Versions: 3.8.0
> Reporter: Charles Oliver Nutter
> Priority: Major
>
> I have struggled with this all day and come to the determination that the
> compiler plugin is *not* picking up module-info from dependency jars that put
> it in the multi-release jar location.
> If you reconfigure the dependency to build with module-info at jar root, the
> dependencies get picked up just fine.
> I've prepared a gist based on two projects I help maintain.
> org.jruby.jcodings:jcodings and org.jruby:bytelist.
> [https://gist.github.com/headius/30359f2bbd26852ef545fd54f6fef248]
> As you can see, with the jcodings module-info in the "release 9"
> multi-release jar location, the bytelist module-info is unable to see the
> exported module.
> This makes the multi-release jar feature largely useless for hiding the
> module-info, but putting it in the root of the jar affects any projects or
> libraries that can't understand it.
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