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https://issues.apache.org/jira/browse/LOG4J2-2922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17195797#comment-17195797
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Remko Popma commented on LOG4J2-2922:
-------------------------------------
+1
> Simplify Java compiler build requirements
> -----------------------------------------
>
> Key: LOG4J2-2922
> URL: https://issues.apache.org/jira/browse/LOG4J2-2922
> Project: Log4j 2
> Issue Type: Improvement
> Components: Build
> Reporter: Matt Sicker
> Priority: Major
>
> The current toolchain setup requires either two or three versions of the JDK
> plus a toolchains.xml Maven configuration. While this setup was sufficient to
> introduce support for Java 9+ APIs, it has made development slower and more
> difficult. Some problems include:
> * Any module that depends on a java9 piece breaks incremental compilation;
> Maven recompiles the entire module every time! This makes it tedious to use
> {{mvn test}} on individual tests.
> * IDEs have difficulty importing and executing toolchain-based Maven projects
> * Contributors have a fairly esoteric hurdle to jump over now to contribute
> to Log4j
> * As Java continues its release cadence of two releases a year, this makes
> it harder to test or develop Log4j on newer JDKs. This has become a more
> obvious problem ever since IDEs like IntelliJ switched from Java 8 to Java 11
> as the default JDK.
> To improve this situation, I propose the following build changes to simplify
> the scenario:
> * Require Java 11 to compile everything.
> * Introduce the animal-sniffer and enforcer Maven plugins to ensure that
> modules aren't unintentionally using or linking to Java APIs added in
> versions 9+
> * Fix log4j-jmx-gui to use the jdk.jconsole module instead of linking to
> tools.jar from the JDK.
> * Find a better multirelease pattern as documented here:
> [https://maven.apache.org/plugins/maven-compiler-plugin/multirelease.html]
> This should result in a build that creates Java 8 compatible artifacts but
> requires Java 11 and only Java 11 to build, therefore significantly
> simplifying development environment setup for this project.
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