Failed to transform class with name com.some.class. Reason: null ---------------------------------------------------------------- Key: JASSIST-141 URL: https://issues.jboss.org/browse/JASSIST-141 Project: Javassist Issue Type: Bug Affects Versions: 3.14.0.GA Environment: eclipse, powermock 1.4.8, easymock 3, junit 4.8, javassist 3.14.0.GA Reporter: Andreas Don'tAskDon'tTell Assignee: Shigeru Chiba Labels: mapmaker, powermock Hi, i get this error while using the @PrepareForTest() annotation from the powermock framework. This framework uses javassist for bytecode manipulation and i think it's more a javassist bug then a powermock bug. the code i try to parse is 2500 lines long (i know bad bad bad code but it's not mine, i only need to test it). i do not want to post all. If you could help me to debug the hole file with javassist to find the methodes or statments that produces this error, i am happy to do so. Is there some debuging level or something to check where javassist crashes? Thankyou for now :D Yours, Andreas and here the stacktrace: java.lang.IllegalStateException: Failed to transform class with name com.some.class. Reason: null at org.powermock.core.classloader.MockClassLoader.loadMockClass(MockClassLoader.java:207) at org.powermock.core.classloader.MockClassLoader.loadModifiedClass(MockClassLoader.java:145) at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:65) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:247) at sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:95) at sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:107) at sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:31) at sun.reflect.annotation.AnnotationParser.parseSig(AnnotationParser.java:370) at sun.reflect.annotation.AnnotationParser.parseClassValue(AnnotationParser.java:351) at sun.reflect.annotation.AnnotationParser.parseClassArray(AnnotationParser.java:653) at sun.reflect.annotation.AnnotationParser.parseArray(AnnotationParser.java:460) at sun.reflect.annotation.AnnotationParser.parseMemberValue(AnnotationParser.java:286) at sun.reflect.annotation.AnnotationParser.parseAnnotation(AnnotationParser.java:222) at sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:69) at sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:52) at java.lang.Class.initAnnotationsIfNecessary(Class.java:3070) at java.lang.Class.getAnnotations(Class.java:3050) at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.classAnnotations(PowerMockJUnit44RunnerDelegateImpl.java:163) at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.getDescription(PowerMockJUnit44RunnerDelegateImpl.java:155) at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.getDescription(JUnit4TestSuiteChunkerImpl.java:172) at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.getDescription(AbstractCommonPowerMockRunner.java:47) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.sendTree(JUnit4TestClassReference.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.sendTrees(RemoteTestRunner.java:476) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:464) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: java.lang.NullPointerException at javassist.bytecode.stackmap.Tracer.checkParamTypes(Tracer.java:888) at javassist.bytecode.stackmap.Tracer.doInvokeMethod(Tracer.java:822) at javassist.bytecode.stackmap.Tracer.doOpcode148_201(Tracer.java:620) at javassist.bytecode.stackmap.Tracer.doOpcode(Tracer.java:102) at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:182) at javassist.bytecode.stackmap.MapMaker.traceException(MapMaker.java:213) at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:175) at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192) at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192) ===================================================================================================================== 243 times this line : at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192) ===================================================================================================================== at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:141) at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:96) at javassist.bytecode.MethodInfo.rebuildStackMap(MethodInfo.java:416) at javassist.bytecode.MethodInfo.rebuildStackMapIf6(MethodInfo.java:398) at javassist.expr.ExprEditor.doit(ExprEditor.java:112) at javassist.CtClassType.instrument(CtClassType.java:1384) at org.powermock.core.transformers.impl.MainMockTransformer.transform(MainMockTransformer.java:77) at org.powermock.core.classloader.MockClassLoader.loadMockClass(MockClassLoader.java:203) ... 28 more