[
https://issues.apache.org/jira/browse/MCOMPILER-323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479551#comment-16479551
]
Robert Scholte commented on MCOMPILER-323:
------------------------------------------
I've been inspired by Russels
http://www.russgold.net/sw/2018/03/looking-for-mr-good-jar/ while improving
https://github.com/codehaus-plexus/plexus-languages/issues/5 and it works quite
well. There's only one huge BUT: the fix for plexus-languages works because we
have a Travis CI-server which verifies multiple Java versions. And this also
means that the unittests are verified for a specific Java version as well.
Downside: IDE doesn't understand it and sees it as a duplicate class.
Please take a look at the blog and see what matches your situation best.
Creating mrjars will be complex and should be avoided. However, if you need it
we should be able to configure several execution blocks properly to reach the
goal. I'm still interested in the solutions others have. And this should be
possible without buildhelper-maven-plugin, just maven-compiler-plugin and
execution-blocks (and ignore the testing part, that's an issue for another
plugin)
> 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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
