Hi there! I'm giving Java 9 and Jigsaw a spin on a moderately complex project. (Interestingly, the project is itself a module system, so we do stuff like annotation processing and dynamic reloading of class loader graphs and services)
I'm experienced enough with advanced Java to have shot myself in the foot with a java.lang.ClassNotFoundException: java.lang.ClassNotFoundException :-) However, I've only recently been looking into Jigsaw in concrete terms. So please be kind when I expose my ignorance :-) Initially, I just want to see if I can get the project to compile on Java 9. So I'm using --add-modules to javac here and there to add modules not available to the unnamed module by default. (Not making any proper modules yet, that will be the next step). This seems to be working fine, except for one of our annotation processors, which happens to use JAXBContext from java.xml.bind. I added --add-modules to javac (via Maven configuration), but my annotation processor still can't load JAXBContext and fails with this message: $ java -version java version "9-ea" Java(TM) SE Runtime Environment (build 9-ea+144) Java HotSpot(TM) 64-Bit Server VM (build 9-ea+144, mixed mode) $ mvn clean install -e This fails with: Caused by: java.lang.NoClassDefFoundError: javax/xml/bind/JAXBContext at com.example.processor.ProcessorUsingJavaXmlBind.process(ProcessorUsingJavaXmlBind.java:24) at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:959) at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:875) at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.access$2100(JavacProcessingEnvironment.java:106) at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1182) at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1290) at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1260) at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:939) at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl$1.call(JavacTaskImpl.java:106) at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl$1.call(JavacTaskImpl.java:100) at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.handleExceptions(JavacTaskImpl.java:137) ... 28 more I've confirmed that this reproduces using only javac: $ cd example-module $ javac -d target/classes -classpath target/classes:$HOME/.m2/repository/com/example/annotation-processor/1.0-SNAPSHOT/annotation-processor-1.0-SNAPSHOT.jar: -sourcepath src/main/java/ -target 1.9 -source 1.9 --add-modules java.xml.bind src/main/java/com/example/module/SomeClass.java java.xml? true java.xml.bind? false An annotation processor threw an uncaught exception. Consult the following stack trace for details. java.lang.NoClassDefFoundError: javax/xml/bind/JAXBContext at com.example.processor.ProcessorUsingJavaXmlBind.process(ProcessorUsingJavaXmlBind.java:24) at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:959) I've reduced this to a minimal-ish test case, available on Github: https://github.com/eirbjo/java-xml-bind-processor Here's the annotation processor: https://github.com/eirbjo/java-xml-bind-processor/blob/master/annotation-processor/src/main/java/com/example/processor/ProcessorUsingJavaXmlBind.java The class under compilation and the annotation: https://github.com/eirbjo/java-xml-bind-processor/blob/master/example-module/src/main/java/com/example/module/SomeClass.java https://github.com/eirbjo/java-xml-bind-processor/blob/master/example-module/src/main/java/com/example/module/SomeAnnotation.java Any clues? Cheers, Eirik.
