PowerMock + TestNG 用 mvn 执行报错

[Yhzhtk]

以下UT问题也困扰了好久，不知道什么原因，用 Eclipse 插件跑 PowerMock + TestNG 都没问题，但是用 mvn 命令就出现以下问题：

Running TestSuite
org.apache.maven.surefire.util.SurefireReflectionException: java.lang.reflect.InvocationTargetException; nested exception is java.lang.reflect.InvocationTargetException: null
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:188)
    at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:166)
    at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:86)
    at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:101)
    at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:74)
Caused by: org.testng.TestNGException: 
An error occurred while instantiating class com.asp.rc.service.LockSysApiServiceTest: null
    at org.testng.internal.ClassHelper.createInstance1(ClassHelper.java:398)
    at org.testng.internal.ClassHelper.createInstance(ClassHelper.java:299)
    at org.testng.internal.ClassImpl.getDefaultInstance(ClassImpl.java:115)
    at org.testng.internal.ClassImpl.getInstances(ClassImpl.java:200)
    at org.testng.internal.TestNGClassFinder.<init>(TestNGClassFinder.java:120)
    at org.testng.TestRunner.initMethods(TestRunner.java:409)
    at org.testng.TestRunner.init(TestRunner.java:235)
    at org.testng.TestRunner.init(TestRunner.java:205)
    at org.testng.TestRunner.<init>(TestRunner.java:153)
    at org.testng.SuiteRunner$DefaultTestRunnerFactory.newTestRunner(SuiteRunner.java:536)
    at org.testng.SuiteRunner.init(SuiteRunner.java:159)
    at org.testng.SuiteRunner.<init>(SuiteRunner.java:113)
    at org.testng.TestNG.createSuiteRunner(TestNG.java:1299)
    at org.testng.TestNG.createSuiteRunners(TestNG.java:1286)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1140)
    at org.testng.TestNG.run(TestNG.java:1057)
    at org.apache.maven.surefire.testng.TestNGExecutor.run(TestNGExecutor.java:70)
    at org.apache.maven.surefire.testng.TestNGDirectoryTestSuite.executeMulti(TestNGDirectoryTestSuite.java:160)
    at org.apache.maven.surefire.testng.TestNGDirectoryTestSuite.execute(TestNGDirectoryTestSuite.java:100)
    at org.apache.maven.surefire.testng.TestNGProvider.invoke(TestNGProvider.java:115)
    ... 9 more
Caused by: java.lang.NullPointerException
    at org.powermock.core.classloader.MockClassLoader.addClassesToModify(MockClassLoader.java:130)
    at org.powermock.modules.testng.internal.PowerMockClassloaderObjectFactory.newInstance(PowerMockClassloaderObjectFactory.java:81)
    at org.powermock.modules.testng.PowerMockObjectFactory.newInstance(PowerMockObjectFactory.java:42)
    at org.testng.internal.ClassHelper.createInstance1(ClassHelper.java:387)
    ... 28 more

网上有相同的问题： http://stackoverflow.com/questions/24437556/my-tests-dont-work-after-switching-between-junit-to-testng

但是对于我的这个问题无解，记录下，未来解决了更新。