我正在使用Powermock 1.6.3和Javassist 3.18.2-GA，Mockito 1.10.19，JUnit 4.11和JDK1.8。我没有编写测试或测试类，因此，我对这些库不是很熟悉。在JDK1.7上构建没有任何问题。我被分配了将应用程序提升到JDK1.8的任务，那时我首先遇到了这个错误。此外，错误仅发生在那些模拟具有静态方法的类或具有调用静态方法的方法的测试类中（使用PowerMockito.mockStatic（）方法的测试类）。我花了很多时间研究这个问题，我觉得自己已经走到了尽头。任何帮助都感激不尽。以下是错误的堆栈跟踪：
java.lang.NoSuchMethodError: javassist.CtMethod.hasAnnotation(Ljava/lang/Class;)Z
at org.powermock.core.transformers.impl.TestClassTransformer.removeTestAnnotationsForTestMethodsThatRunOnOtherClassLoader(TestClassTransformer.java:185)
at org.powermock.core.transformers.impl.TestClassTransformer.transform(TestClassTransformer.java:198)
at org.powermock.core.classloader.MockClassLoader.loadMockClass(MockClassLoader.java:250)
at org.powermock.core.classloader.MockClassLoader.loadModifiedClass(MockClassLoader.java:179)
at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:70)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:145)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:40)
at org.powermock.tests.utils.impl.AbstractTestSuiteChunkerImpl.createTestDelegators(AbstractTestSuiteChunkerImpl.java:244)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.<init>(JUnit4TestSuiteChunkerImpl.java:61)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.<init>(AbstractCommonPowerMockRunner.java:32)
at org.powermock.modules.junit4.PowerMockRunner.<init>(PowerMockRunner.java:34)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
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.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:51)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:123)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:104)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:164)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:110)
at org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:175)
at org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcessWhenForked(SurefireStarter.java:107)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:68)
P.S。我尝试过Javassist和Powermock的许多不同组合，但都导致了错误。
答案 0 :(得分：3)
Power Mock 1.6.3是compiled against Javassist 3.20.0-GA。如果这导致NoSuchMethodError，请确保类路径上没有其他库需要更新版本的Javassist。
答案 1 :(得分：1)
遇到同样的问题。正如 Rafael 所提到的，这个问题是由于 Javassist 版本冲突造成的。由于我的项目是maven build项目，所以我用下面的来查看dependency tree
mvn org.apache.maven.plugins:maven-dependency-plugin:2.10:tree -Dverbose=true
从输出中，我可以找到哪个组件将 Javassist 作为传递依赖项。然后使用 maven dependency exclusion，从类路径中删除该冲突版本。
希望对你有帮助