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https://issues.apache.org/jira/browse/MNG-6293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17386457#comment-17386457
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Robert Scholte commented on MNG-6293:
-------------------------------------

Currently we support close to "out-of-the-box". The problem is testing: there 
are several different ways to test, but it has impact on how to build a MRJAR. 
All can be read at 
https://maven.apache.org/plugins/maven-compiler-plugin/multirelease.html
Currently we define 5 (!) patterns and all are available at 
https://github.com/apache/maven-compiler-plugin/tree/master/src/it/multirelease-patterns.

I'm going to push this forward to Maven 5 just as a consideration, we still 
need to figure out how and if it is worth it.

> Support multi-release JARs (JDK 9 feature)
> ------------------------------------------
>
>                 Key: MNG-6293
>                 URL: https://issues.apache.org/jira/browse/MNG-6293
>             Project: Maven
>          Issue Type: Improvement
>            Reporter: Marcus Hirt
>            Priority: Major
>             Fix For: 4.x / Backlog
>
>
> In JDK 9 the concept of multi-release jars were introduced:
> http://openjdk.java.net/jeps/238
> It would be wonderful if maven supported building multi-release jars 
> out-of-the-box. With the future high release-cadence of Java, this may become 
> an increasingly important feature.
> Here is an interim solution:
> https://github.com/metlos/multi-release-jar-maven-plugin



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