java.lang.ClassFormatError: This exception has no message.

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java.lang.ClassFormatError:
at sun.instrument.InstrumentationImpl.redefineClasses0(Native Method)
at sun.instrument.InstrumentationImpl.redefineClasses(InstrumentationImpl.java:170)
at mockit.internal.startup.InstrumentationHolder.redefineClasses(InstrumentationHolder.java:193)
at mockit.internal.startup.Startup.redefineMethods(Startup.java:192)
at mockit.internal.startup.Startup.redefineMethods(Startup.java:186)
at mockit.internal.mockups.MockClassSetup.applyClassModifications(MockClassSetup.java:137)
at mockit.internal.mockups.MockClassSetup.redefineMethodsInClassHierarchy(MockClassSetup.java:94)
at mockit.internal.mockups.MockClassSetup.redefineMethods(MockClassSetup.java:79)
at mockit.MockUp.redefineMethods(MockUp.java:315)
at mockit.MockUp.redefineClassOrImplementInterface(MockUp.java:297)
at mockit.MockUp.(MockUp.java:139)
at mockit.integration.junit4.internal.BlockJUnit4ClassRunnerDecorator.(BlockJUnit4ClassRunnerDecorator.java:23)
at mockit.internal.startup.JMockitInitialization.applyInternalStartupMocksAsNeeded(JMockitInitialization.java:45)
at mockit.internal.startup.JMockitInitialization.initialize(JMockitInitialization.java:27)
at mockit.internal.startup.Startup.applyStartupMocks(Startup.java:71)
at mockit.internal.startup.Startup.initialize(Startup.java:62)
at mockit.internal.startup.Startup.initializeIfPossible(Startup.java:160)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:104)
at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:86)
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)

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