avassist.ModuleClassPath throws NoSuchMethodError when running on Jigsaw EA build --------------------------------------------------------------------------------- Key: JASSIST-264 URL: https://issues.jboss.org/browse/JASSIST-264 Project: Javassist Issue Type: Bug Reporter: Mandy Chung Assignee: Shigeru Chiba Project Jigsaw EA build is available for download at http://openjdk.java.net/projects/jigsaw/ea The Jigsaw EA build is the latest prototype implementation of JSR 376, the Java Platform Module System, that implements the proposals to resolve the JSR 376 open issues: http://openjdk.java.net/projects/jigsaw/spec/issues/ java.lang.NoSuchMethodError: java.lang.reflect.Layer.parent()Ljava/util/Optional; at javassist.ModuleClassPath.<init>(ModuleClassPath.java:53) at javassist.ModuleClassPath.<init>(ModuleClassPath.java:39) at javassist.ClassPoolTail.appendSystemPath(ClassPoolTail.java:249) at javassist.ClassPool.appendSystemPath(ClassPool.java:944) at javassist.ClassPool.<init>(ClassPool.java:179) is calling java.lang.reflect.Layer::parent method. Layer::parent method is not present due to the solution #NonHierarchicalLayers issue. Looks like ModuleClassPath class is added to resolved JASSIST-261 and unclear why Layer::parent is needed. But looks like this is related to #ClassFilesAsResources issue in JDK 9 that encapsulate .class file from access. The Jigsaw EA build has resolved #ClassFilesAsResources to allow ClassLoader::getResource* methods to access .class files. Note that this is not in JDK 9 yet. Please subscribe to jigsaw-dev(a)openjdk.java.net for announcement.