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https://issues.apache.org/jira/browse/MCOMPILER-323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16364819#comment-16364819
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Robert Scholte commented on MCOMPILER-323:
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If you care less about ensuring all unittests work with the specified Java
version, you should have a look at
[https://github.com/RedHatJava9Testing/multi-release.] This is a single Maven
project setup which generates a multirelease jar.
> Support multi-release jars
> --------------------------
>
> Key: MCOMPILER-323
> URL: https://issues.apache.org/jira/browse/MCOMPILER-323
> Project: Maven Compiler Plugin
> Issue Type: Improvement
> Reporter: Mike Drob
> Priority: Major
>
> Java 9 allows for JRE version specific code in the form of "multi-release
> jars"
> Older JREs will treat them as normal jars, while newer JREs will load the
> appropriate specific classes. AFAICT, maven does not currently support this.
> Compiler plugin should automatically detect when there are multiple source
> levels and set MRJAR=True in the manifest.
> Source directories could potentially be src/main/java, src/main/java9,
> src/main/java10, etc. These probably need to be configurable as well, or some
> deeper discussion about what makes sense and is intuitive for users.
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