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What's Changed

• [MCOMPILER-341] Compile module descriptors with TestCompilerMojo by @sormuras in #4
• [MCOMPILER-349] - changed dependency detection. by @atsyganenko in #6
• [MCOMPILER-360] nullpointer exception by @brychcy in #7
• [MCOMPILER-306] Fix compilerArgs example usage by @Stephan202 in #9
• (doc) Fixed broken links to scm, issue tracker, and mailing list page. by @hendriks73 in #15
• Fix typos by @geoand in #16
• Miscellaneous code cleanups by @rhowe in #17
• [MCOMPILER-349] cleanups by @rhowe in #18
• (doc) Use !isEmpty() instead of size() > 0 by @rhowe in #20
• Cleanup debug log handling by @rhowe in #21
• (doc) Simplify CompilationFailureException by @rhowe in #19
• MCOMPILER-359 - Fix for NPE by @hohwille in #28
• (doc) Add example on using --release javac option by @manouti in #29
• (doc) Fixes in multirelease page by @pzygielo in #26
• Remove extra-check for staleSources is non-null by @pzygielo in #32
• Bump plexusCompilerVersion to 2.8.8 by @pzygielo in #39
• ci: JDK 15 by @sullis in #41
• Grammar on 'Compiling Sources Using A Different JDK' page by @mthmulders in #42
• Bump junit from 4.13.1 to 4.13.2 by @dependabot in #49
• Bump actions/cache from v2.1.1 to v2.1.5 by @dependabot in #47
• Bump actions/checkout from 2 to 2.3.4 by @dependabot in #53
• Bump actions/cache from 2.1.5 to 2.1.6 by @dependabot in #55
• Fixed the comment in the POM by @LorenzoBettini in #66
• Fix project key in PR template by @slawekjaranowski in #75
• [MCOMPILER-475] Shared GitHub Actions by @slawekjaranowski in #74
• Bump qdox from 2.0.0 to 2.0.1 by @dependabot in #77
• Bump mockito-core from 2.28.2 to 4.0.0 by @dependabot in #71
• Bump plexusCompilerVersion from 2.8.8 to 2.9.0 by @dependabot in #70
• Bump mockito-core from 4.0.0 to 4.1.0 by @dependabot in #79
• Bump mockito-core from 4.1.0 to 4.2.0 by @dependabot in #80
• Bump plexus-component-metadata from 2.1.0 to 2.1.1 by @dependabot in #81

New Contributors

• @sormuras made their first contribution in #4
• @atsyganenko made their first contribution in #6
• @brychcy made their first contribution in #7
• @Stephan202 made their first contribution in #9
• @hendriks73 made their first contribution in #15
• @geoand made their first contribution in #16
• @rhowe made their first contribution in #17
• @hohwille made their first contribution in #28
• @manouti made their first contribution in #29
• @sullis made their first contribution in #41
• @mthmulders made their first contribution in #42
• @LorenzoBettini made their first contribution in #66
• @slawekjaranowski made their first contribution in #75

Full Changelog: https://github.com/apache/maven-compiler-plugin/commits/maven-compiler-plugin-3.9.0