title: LinkageError when try to mock X500Principal in junit
body: <p>I am trying to write test case by mocking java.security.cert.X509Certificate, javax.security.auth.x500.X500Principal using PowerMockRunner. When I tried to import the class for the X500Principal IDE is showing 2 import options (javax.security.auth.x500.X500Principal, com.sun.security.auth.X500Principal). I had used the correct import still It is showing the following error. Also the other import is deprecated one.</p>
  
  <pre><code>Exception in thread "main" java.lang.LinkageError: loader constraint violation: when resolving overridden method "$java.security.cert.X509Certificate$$EnhancerByMockitoWithCGLIB$$887d20cf.getSubjectX500Principal()Ljavax/security/auth/x500/X500Principal;" the class loader (instance of org/powermock/core/classloader/MockClassLoader) of the current class, $java/security/cert/X509Certificate$$EnhancerByMockitoWithCGLIB$$887d20cf, and its superclass loader (instance of &lt;bootloader&gt;), have different Class objects for the type javax/security/auth/x500/X500Principal used in the signature
      at sun.reflect.GeneratedSerializationConstructorAccessor13.newInstance(Unknown Source)
      at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
      at org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator.newInstance(SunReflectionFactoryInstantiator.java:40)
      at org.objenesis.ObjenesisBase.newInstance(ObjenesisBase.java:59)
      at org.mockito.internal.creation.jmock.ClassImposterizer.createProxy(ClassImposterizer.java:128)
      at org.mockito.internal.creation.jmock.ClassImposterizer.imposterise(ClassImposterizer.java:63)
      at org.powermock.api.mockito.internal.mockcreation.MockCreator.createMethodInvocationControl(MockCreator.java:109)
      at org.powermock.api.mockito.internal.mockcreation.MockCreator.mock(MockCreator.java:57)
      at org.powermock.api.mockito.PowerMockito.mock(PowerMockito.java:203)
      at org.powermock.api.extension.listener.AnnotationEnabler.standardInject(AnnotationEnabler.java:106)
      at org.powermock.api.extension.listener.AnnotationEnabler.beforeTestMethod(AnnotationEnabler.java:54)
      at org.powermock.tests.utils.impl.PowerMockTestNotifierImpl.notifyBeforeTestMethod(PowerMockTestNotifierImpl.java:90)
      at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:292)
      at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:127)
      at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82)
      at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:282)
      at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:87)
      at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:50)
      at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:207)
      at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:146)
      at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
      at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34)
      at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44)
      at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:122)
      at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:106)
      at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
      at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59)
      at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
      at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:78)
      at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:212)
      at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:68)
      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:483)
      at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
  
  Process finished with exit code 1
  </code></pre>