🚀 New features and improvements

• Enable GitHub Issues (#305) @slawekjaranowski
• [MCOMPILER-579] - allow module-version configuration (#273) @mguillem
• Bump org.codehaus.plexus:plexus-java from 1.2.0 to 1.4.0 - JDK 24 support (#293) @dependabot[bot]
• Update release-drafter configuration, PR automation (#281) @slawekjaranowski
• [MCOMPILER-588] - JUnit4 test framework to JUnit5 migration (#236) @MidNight-er

🐛 Bug Fixes

• Fix release-drafter config (#292) @slawekjaranowski
• [MCOMPILER-591] - testCompile - fix detections of target less than 1.9 (#240) @slawekjaranowski

📦 Dependency updates

• Bump org.codehaus.plexus:plexus-java from 1.2.0 to 1.4.0 - JDK 24 support (#293) @dependabot[bot]
• Bump mavenVersion from 3.6.3 to 3.9.9 (#283) @dependabot[bot]
• Bump org.mockito:mockito-core from 4.8.0 to 4.11.0 (#288) @dependabot[bot]
• Bump org.apache.maven.plugins:maven-plugins from 42 to 43 (#285) @dependabot[bot]
• [MCOMPILER-590] - Bump org.apache.maven.plugins:maven-plugins from 41 to 42 (#235) @dependabot[bot]

👻 Maintenance

• Update scm tag according to branch (#303) @slawekjaranowski
• [MNGSITE-529] - Rename "Goals" to "Plugin Documentation" (#300) @Bukama
• Use JUnit version from parent (#299) @slawekjaranowski
• [MCOMPILER-529] - Update docs about version schema (Maven 3) (#295) @Bukama
• Use default Maven versions for build on GitHub (#289) @slawekjaranowski
• Remove Maven 3 note (#241) @elharo
• Remove info about old versions (#237) @elharo

🔧 Build

• Exclude JDK 8 - temurin, adopt-openj9 on macos, use defaults values (#238) @slawekjaranowski

🚀 New features and improvements

• Enable GitHub Issues (#287) @slawekjaranowski
• Upgrade to Maven 4.0.0-rc-2. (#276) @desruisseaux
• Bump org.ow2.asm:asm from 9.7 to 9.7.1 - JDK 24 support (#270) @dependabot[bot]
• Add dependabot for 3.x branch (#279) @slawekjaranowski
• Update release-drafter configuration (#277) @slawekjaranowski
• Add PR automation (#278) @slawekjaranowski
• Rewrite the plugin using standard javax.tools API instead of Plexus. (#271) @desruisseaux
• Cleanup usages of System.getProperty calls. (#261) @turbanoff

🐛 Bug Fixes

• [MCOMPILER-592] - IndexOutOfBoundsException when project.build.output… (#244) @thijsrijpert
• Fix CompilerMojo#getSourceInclusionScanner(String) illogical addAll (#243) @JackPGreen
• Fix message when building because of a clean state (#242) @gnodet
• Fix wrong Toolchain message (#253) @gnodet

📦 Dependency updates

• Bump org.ow2.asm:asm from 9.7 to 9.7.1 - JDK 24 support (#270) @dependabot[bot]
• Bump commons-io:commons-io from 2.7 to 2.14.0 in /src/it/MCOMPILER-203-processorpath/annotation-user (#264) @dependabot[bot]

📝 Documentation updates

• [MNGSITE-529] - Rename "Goals" to "Plugin Documentation" (#296) @Bukama

👻 Maintenance

• Add Stale action (#304) @slawekjaranowski
• Publish documentation to LATEST-4.x (#301) @slawekjaranowski
• Update docs for Maven 4 and release option (#294) @Bukama
• Rename property moduleVersion to maven.compiler.moduleVersion (#302) @slawekjaranowski
• Add badge for 3.x version (#297) @slawekjaranowski
• Simplify GH action (#298) @slawekjaranowski
• Disable Jenkins build (#280) @slawekjaranowski
• Refactoring: AbstractCompilerMojo: Replace StringBuilder with String.join() (#265) @stokito
• Remove old JUnit 3.x reference (#254) @gnodet
• Fix build with Maven 4 (#252) @gnodet

What's Changed

• Exclude JDK 8 - temurin, adopt-openj9 on macos, use defaults values by @slawekjaranowski in #238
• Remove info about old versions by @elharo in #237
• [MCOMPILER-588] JUnit4 test framework to JUnit5 migration by @MidNight-er in #236
• [MCOMPILER-591] testCompile - fix detections of target less than 1.9 by @slawekjaranowski in #240
• [MCOMPILER-590] Bump org.apache.maven.plugins:maven-plugins from 41 to 42 by @dependabot in #235
• Remove Maven 3 note by @elharo in #241
• [MCOMPILER-593] Switch to the Maven 4 API by @gnodet in #147
• Cleanup by @gnodet in #249
• Fix license/notice by @gnodet in #250
• Build with JDK 17 and 21 in Jenkins by @gnodet in #251

New Contributors

• @MidNight-er made their first contribution in #236

Full Changelog: maven-compiler-plugin-3.13.0...maven-compiler-plugin-4.0.0-beta-1

🚀 New features and improvements

• [MCOMPILER-574] - Propagate cause of exception in AbstractCompilerMojo (#232) @slawekjaranowski
• [MCOMPILER-582] - Automatic detection of release option for JDK < 9 (#228) @slawekjaranowski
• [MCOMPILER-583] - Require Maven 3.6.3 (#229) @slawekjaranowski
• [MCOMPILER-577] - Rename parameter "forceJavacCompilerUse" (#225) @kwin
• [MCOMPILER-570] - Add links to javac documentation of JDK17 (#224) @kwin
• [MCOMPILER-576] - Deprecate parameter "compilerVersion" (#223) @kwin

📦 Dependency updates

• [MCOMPILER-575] - Bump plexusCompilerVersion from 2.14.2 to 2.15.0 (#227) @dependabot
• Bump apache/maven-gh-actions-shared from 3 to 4 (#226) @dependabot

📝 Documentation updates

• [MCOMPILER-548] - JDK 21 throws annotations processing warning that can not be turned off (#200) @hgschmie

👻 Maintenance

• [MCOMPILER-584] - Refresh page - Using Non-Javac Compilers (#231) @slawekjaranowski
• [MCOMPILER-585] - Refresh plugins versions in ITs (#230) @slawekjaranowski
• subject verb agreement (#221) @elharo

🐛 Bug Fixes

• [MCOMPILER-567] - Fail to compile if the generated-sources/annotation… (#218) @jorsol

📦 Dependency updates

• [MCOMPILER-568] - Bump plexusCompilerVersion from 2.14.1 to 2.14.2 (#220) @dependabot

🚀 New features and improvements

• [MCOMPILER-562] - Add property maven.compiler.outputDirectory to CompilerMojo (#213) @jGauravGupta
• [MCOMPILER-381] - Refactor incremental detection (#181) @jorsol
• [MCOMPILER-542] - Clean JDK patch version in module-info.class (#208) @jorsol
• [MCOMPILER-558] - compileSourceRoots in testCompile should be writable (#209) @lorenzsimon
• [MCOMPILER-559] - Warn if overwriting the project's artifact's file to a different value (#211) @gnodet
• [MCOMPILER-550] - make outputDirectory writable (#202) @bmarwell
• [MCOMPILER-549] - Improve log message in case of recompilation - fix jenkins build (#203) @slawekjaranowski
• [MCOMPILER-549] - Improve log message in case of recompilation (#201) @BrowneMonke
• [MCOMPILER-391] - Use dep mgmt when resolving annotation processors and their deps (#180) @psiroky
• [MCOMPILER-531] - Prepare for Java 20(-ea) (#184) @slachiewicz

🐛 Bug Fixes

• [MCOMPILER-333] - Cleanup generated source files (#214) @jorsol
• [MCOMPILER-544] - don't add items to classpath that are not used for that (#198) @laeubi
• [MCOMPILER-547] - : Initialize pathElements to empty (#199) @rovarga

📦 Dependency updates

• [MCOMPILER-564] - Bump plexusCompilerVersion from 2.13.0 to 2.14.1 (#216) @dependabot
• [MCOMPILER-557] - Upgrade maven-plugin parent to 41 - fix build (#210) @slawekjaranowski
• [MCOMPILER-554] - Update plexus-java to 1.2.0 (#207) @jorsol
• [MCOMPILER-551] - Upgrade Parent to 40 (#205) @slawekjaranowski
• [MCOMPILER-541] - update maven-shared-utils to 3.4.2 (#195) @elharo
• Bump apache/maven-gh-actions-shared from 2 to 3 (#182) @dependabot
• Bump maven-invoker-plugin from 3.4.0 to 3.5.0 (#179) @dependabot

👻 Maintenance

• [MCOMPILER-565] - Allow project build by Maven 4 (#217) @slawekjaranowski
• [MCOMPILER-552] - Refresh download page (#204) @slawekjaranowski
• Remove references to old Maven versions. (#194) @elharo
• (doc) Drop unused and vulnerable dependency to log4j (#190) @slachiewicz
• [MNG-6829] - Replace StringUtils#isEmpty(String) & #isNotEmpty(String) (#189) @timtebeek
• Update plexus-utils to 3.0.24 - in its (#183) @slachiewicz

🚀 New features and improvements

• [MCOMPILER-494] - Add a useModulePath switch to the testCompile mojo (#119) @dmlloyd
• [MCOMPILER-395] - Allow dependency exclusions for 'annotationProcessorPaths' (#173) @psiroky
• [MCOMPILER-522] - Use maven-resolver to resolve 'annotationProcessorPaths' dependencies (#169) @psiroky
• [MCOMPILER-516] - upgrade plexus-compiler to improve compiling message (#164) @hboutemy
• [MCOMPILER-501] - compileSourceRoots parameter should be writable (#159) @gnodet
• [MCOMPILER-457] - Change showWarnings to true by default (#157) @pzygielo
• [MCOMPILER-457] - Warn about warn-config conflicting values (#153) @pzygielo
• [MCOMPILER-505] - Update default source/target from 1.7 to 1.8 (#149) @jorsol
• [MCOMPILER-499] - display recompilation causes (#143) @olamy
• [MCOMPILER-500] - add some parameter to pattern from stale source calculation (#141) @olamy
• [MCOMPILER-488] - dedicated option for implicit javac flag (#102) @pzygielo

🐛 Bug Fixes

• [MCOMPILER-525] - Incorrect detection of dependency change (#172) @jorsol
• [MCOMPILER-523] - Test with Maven 3.9.0 and fix the failing IT (#176) @gnodet
• [MCOMPILER-503] - Resolve all annotation processor dependencies together (#170) @psiroky
• [MCOMPILER-512] - Defining maven.compiler.release as empty string end… (#158) @project25o1
• [MCOMPILER-495] - Fixes missing dirs in createMissingPackageInfoClasses (#121) @jmax01
• [MCOMPILER-347] - Set Xcludes in config passed to actual compiler (#101) @pzygielo

📦 Dependency updates

• Bump apache/maven-gh-actions-shared from 2 to 3 (#182) @dependabot
• Bump maven-invoker-plugin from 3.4.0 to 3.5.0 (#179) @dependabot
• [MCOMPILER-527] - Upgrade plexus-java to 1.1.2 (#177) @gnodet
• [MCOMPILER-526] - Upgrade to parent 39 (#175) @gnodet
• Bump junit from 4.12 to 4.13.1 in /src/it/multirelease-patterns/packaging-plugin (#115) @dependabot
• [MCOMPILER-519] - Upgrade maven-invoker-plugin from 3.3.0 to 3.4.0 (#166) @psiroky
• Bump qdox from 2.0.2 to 2.0.3 (#152) @dependabot
• Bump maven-jxr-plugin from 3.2.0 to 3.3.0 (#146) @dependabot
• Bump maven-jxr-plugin from 3.1.1 to 3.2.0 (#105) @dependabot
• Bump junit from 4.10 to 4.13.1 in /src/it/MCOMPILER-203-processorpath/annotation-user (#114) @dependabot
• Bump plexusCompilerVersion from 2.12.0 to 2.12.1 (#139) @dependabot
• Bump maven-shared-utils from 0.1 to 3.3.3 in /src/it/MCOMPILER-157/annotation-verify (#127) @dependabot
• Bump maven-shared-utils from 0.1 to 3.3.3 in /src/it/MCOMPILER-203-processorpath/annotation-verify (#128) @dependabot
• Bump mockito-core from 4.6.0 to 4.6.1 (#132) @dependabot
• Bump maven-release-plugin from 3.0.0-M5 to 3.0.0-M6 (#133) @dependabot
• Bump mockito-core from 4.5.1 to 4.6.0 (#130) @dependabot
• Bump maven-invoker-plugin from 3.2.2 to 3.3.0 (#131) @dependabot
• Bump junit from 4.8.2 to 4.13.1 in /src/it/groovy-project-with-new-plexus-compiler (#124) @dependabot
• Bump junit from 4.12 to 4.13.1 in /src/it/MCOMPILER-298 (#125) @dependabot
• Bump plexusCompilerVersion from 2.11.2-SNAPSHOT to 2.12.0 (#122) @dependabot
• Bump junit from 4.12 to 4.13.1 in /src/it/multirelease-patterns/singleproject-runtime (#110) @dependabot
• Bump junit from 4.12 to 4.13.1 in /src/it/multirelease-patterns/multiproject/multirelease-nine (#112) @dependabot
• Bump junit from 4.12 to 4.13.1 in /src/it/multirelease-patterns/multimodule/multirelease-base (#111) @dependabot
• Bump junit from 4.10 to 4.13.1 in /src/it/MCOMPILER-157/annotation-user (#108) @dependabot
• Bump junit from 4.12 to 4.13.1 in /src/it/multirelease-patterns/multiproject/multirelease-base (#109) @dependabot
• Bump junit from 4.12 to 4.13.1 in /src/it/multirelease-patterns/multimodule/multirelease-nine (#113) @dependabot
• Bump junit from 4.12 to 4.13.1 in /src/it/multirelease-patterns/singleproject-toolchains (#116) @dependabot
• Bump commons-io from 2.4 to 2.7 in /src/it/MCOMPILER-203-processorpath/annotation-user (#117) @dependabot
• Bump maven-javadoc-plugin from 3.3.2 to 3.4.0 (#118) @dependabot
• Bump mockito-core from 4.4.0 to 4.5.1 (#107) @dependabot
• Bump mockito-core from 4.3.1 to 4.4.0 (#100) @dependabot

👻 Maintenance

• [MCOMPILER-526] - Fix IT (#178) @gnodet
• usage of reflection is not needed anymore (#140) @olamy

🔧 Build

• asf.yaml: autolink MCOMPILER JIRAs (#171) @psiroky
• test build with 18 (#126) @olamy

🚀 New features and improvements

• [MCOMPILER-426] - add flag to enable-preview java compiler feature (#98) @olamy

🐛 Bug Fixes

• [MCOMPILER-346] - workaround to jdk bug: assertion error from javaxcompiler javax.tools API (#97) @olamy
• [MCOMPILER-485] - Fixes internal string format in generated package-info.class (#95) @dbwiddis

📦 Dependency updates

• Bump maven-javadoc-plugin from 3.3.1 to 3.3.2 (#94) @dependabot

Other contributions

• thanks to @basil for providing an IT test for the fix of [MCOMPILER-346]

🚨 Removed

• [MCOMPILER-484] - Remove deprecated mojos (#87) @gnodet

🚀 New features and improvements

• [MCOMPILER-205] - Add a boolean to generate missing package-info classes by default (#88) @gnodet
• [MCOMPILER-474] - Also check jar files when determining if dependencies changed (#73) @Powerrr

🐛 Bug Fixes

• [MCOMPILER-225] - javac.sh/javac.bat added to archive (#91) @olamy
• [MCOMPILER-481] - compiler plugin should include static module for compilation (#82) @olamy
• [MCOMPILER-470] -parameters doesn't work with --release
• [MCOMPILER-460] - Compiler doesn't show detailed information with the Maven Toolchains

📦 Dependency updates

• use plexus-compiler 2.10.0 (#92) @olamy
• Bump mockito-core from 4.2.0 to 4.3.1 (#83) @dependabot

📝 Documentation updates

• [MCOMPILER-479] - Clarify compiler arguments Javadoc (#90) @hisener
• (doc) Fix typo and follow xml block style used for other parameters (#89) @pzygielo

🔧 Build

• add more jdk for testing (#93) @olamy

Content might be not complete

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