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https://issues.apache.org/jira/browse/MCOMPILER-550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benjamin Marwell resolved MCOMPILER-550.
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Resolution: Fixed
Fixed in
https://github.com/apache/maven-compiler-plugin/commit/c459d1d2738a78e387e2f67ee86626bc5fc55a7c
> Make 'outputDirectory' writable
> -------------------------------
>
> Key: MCOMPILER-550
> URL: https://issues.apache.org/jira/browse/MCOMPILER-550
> Project: Maven Compiler Plugin
> Issue Type: Improvement
> Reporter: Benjamin Marwell
> Assignee: Benjamin Marwell
> Priority: Major
> Fix For: 3.12.0
>
>
> h2. Description of Improvement
> Currently, the property 'outputDirectory' is not writable, i.e. not meant to
> be modified.
> However, making it writable has at least two major advantages.
> h2. Use case one -- variable is already used
> Some Tutorials (e.g. https://www.baeldung.com/maven-multi-release-jars)
> already make use of rewriting the variable.
> h2. Use case two: MR-Jars with different bytecode level.
> Another use case is Multi-Release-Jars. Currently, they can officially only
> be controlled by setting the {{release}} property. That will not only require
> a suitable JDK or Toolchain-JDK, it will also require the bytecode for that
> version to be the bytecode of that version.
> E.g. using {{release}} and {{multiReleaseOutput}}, the bytecode in
> {{META-INF/version/java9}} MUST be exactly Java 9 bytecode.
> However, the JDK does not know of such restrictions.
> Using {{outputDirectory}}, you can now create Java 8 bytecode to run in e.g.
> Java 24. Here is an example use case:
> https://github.com/groovy/GMavenPlus/pull/287
> Granted, this could also be done differently, but this way it seems a little
> more elegant.
> The actual advantage is, that some developers can now plan ahead. For
> example, the SecurityManager is not just deprecated, it is deprecated for
> removal. The moment we know which Java version it is, we can create a MR-Jar
> for e.g. Java 30, even though Java 30 SDKs are not available then (currently
> we have Java 21 GA).
> h2. Proposed solution
> Make variable writable as suggested in Slack.
> PR available locally.
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