open-java-format Eclipse Plugin

Installation

1. Run ./gradlew :open-java-format-eclipse-plugin:build in the main folder,
2. Eclipse has to run on Java 21 or later, as current Eclipse packages do. The formatter reaches into javac, so add these options to eclipse.ini after -vmargs:

   --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED
   --add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED
   --add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED
   --add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED
   --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED
   

   Keep each option and its value on one line, joined by =: the Eclipse launcher starts the JVM inside its own process, and an option split over two lines does not take effect — formatting then fails with an IllegalAccessError in the workspace log.
3. Copy open-java-format-eclipse-plugin/build/libs/open-java-format-eclipse-plugin-<version>.jar to the dropins folder of your Eclipse installation,
4. Run eclipse -clean,
5. Pick open-java-format in Window → Preferences (Eclipse → Settings on macOS) → Java → Code Style → Formatter → Formatter implementation.