PowerMockito @prepareForTest issue

[Mark Warner]

When a large class with 2000+ lines is added to @prepareForTest  the following error is encountered

java.lang.IllegalStateException: Failed to transform class with name com.gnx.company.UtilityClass Reason: javassist.bytecode.Utf8Info cannot be cast to javassist.bytecode.ClassInfo
at org.powermock.core.classloader.MockClassLoader.loadMockClass(MockClassLoader.java:247)
    at org.powermock.core.classloader.MockClassLoader.loadModifiedClass(MockClassLoader.java:177)
    at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:68)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:274)
    at sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:114)
    at sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:125)
    at sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49)
    at sun.reflect.annotation.AnnotationParser.parseSig(AnnotationParser.java:432)
    at sun.reflect.annotation.AnnotationParser.parseClassValue(AnnotationParser.java:413)
    at sun.reflect.annotation.AnnotationParser.parseClassArray(AnnotationParser.java:715)
    at sun.reflect.annotation.AnnotationParser.parseArray(AnnotationParser.java:522)
    at sun.reflect.annotation.AnnotationParser.parseMemberValue(AnnotationParser.java:348)
    at sun.reflect.annotation.AnnotationParser.parseAnnotation2(AnnotationParser.java:283)
    at sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:117)
    at sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:70)
    at java.lang.Class.initAnnotationsIfNecessary(Class.java:3271)
    at java.lang.Class.getAnnotation(Class.java:3219)
    at org.junit.internal.MethodSorter.getDeclaredMethods(MethodSorter.java:52)
    at org.junit.internal.runners.TestClass.getAnnotatedMethods(TestClass.java:45)
    at org.junit.internal.runners.MethodValidator.validateTestMethods(MethodValidator.java:71)
    at org.junit.internal.runners.MethodValidator.validateStaticMethods(MethodValidator.java:44)
    at org.junit.internal.runners.MethodValidator.validateMethodsForDefaultRunner(MethodValidator.java:50)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.validate(PowerMockJUnit44RunnerDelegateImpl.java:108)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.<init>(PowerMockJUnit44RunnerDelegateImpl.java:70)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl.<init>(PowerMockJUnit47RunnerDelegateImpl.java:42)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit49RunnerDelegateImpl.<init>(PowerMockJUnit49RunnerDelegateImpl.java:25)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:149)
    at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:39)
    at org.powermock.tests.utils.impl.AbstractTestSuiteChunkerImpl.createTestDelegators(AbstractTestSuiteChunkerImpl.java:218)
    at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.<init>(JUnit4TestSuiteChunkerImpl.java:59)
    at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.<init>(AbstractCommonPowerMockRunner.java:32)
    at org.powermock.modules.junit4.PowerMockRunner.<init>(PowerMockRunner.java:33)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:29)
    at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:21)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
    at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
    at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:26)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:33)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:48)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452)
    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.ClassCastException: javassist.bytecode.Utf8Info cannot be cast to javassist.bytecode.ClassInfo
    at javassist.bytecode.ConstPool.getClassInfo(ConstPool.java:232)
    at javassist.bytecode.stackmap.Tracer.doOpcode148_201(Tracer.java:631)
    at javassist.bytecode.stackmap.Tracer.doOpcode(Tracer.java:81)
    at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:187)
    at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:199)
  ..............

The UtilityClass consists of 2300 lines of code.There are static methods inside the class that needs to be accessed .So need to add the class to @prepareForTest.
 Anyone knows how to fix this issue?

Thanks.

[Johan Haleby]

Unfortunately I don't think there's an easy fix. This looks like it may be an issue with Javassist so you might want to report it to their issue tracker. 

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