Following up on my example, I updated both the annotation processor and the example-module to be proper Java 9 modules with module-info.java.
Maven then moved the annotation processor to the --module-path for example-module's compilation. That did not seem to work. The processor wasn't loaded at all. Then I saw that javac also has a --processor-module-path which seemed promising. However, my processor was not loaded at all. First, let us verify that out module is actually a module now: $ java -p ~/.m2/repository/com/example/annotation-processor/1.0-SNAPSHOT/annotation-processor-1.0-SNAPSHOT.jar --list-modules com.example.annotation.processor com.example.annotation.processor (file:///$HOME/.m2/repository/com/example/annotation-processor/1.0-SNAPSHOT/annotation-processor-1.0-SNAPSHOT.jar) requires mandated java.base requires java.compiler requires java.xml.bind conceals com.example.processor Then, compile the example module, now using --processor-module-path: $ javac --processor-module-path ~/.m2/repository/com/example/annotation-processor/1.0-SNAPSHOT/annotation-processor-1.0-SNAPSHOT.jar -sourcepath src/main/java src/main/java/module-info.java src/main/java/com/example/module/SomeClass.java -g -nowarn -target 1.9 -source 9 No output, the annotation-processor was not loaded. Is there some trick needed to load annotation processors as modules? Eirik.
