title: Powermock after log4j2.3 upgrade Could not reconfigure JMX java.lang.LinkageError
body: <p>Im upgrading log4j from 1.x to 2.3. after setting up maven dependencies my project is builing and application is running fine.</p>
  
  <p>But while builing, at test goal getting below mentioned error in variouse unit Test classes which are already there.</p>
  
  <p>I could find a workaround by using @PowerMockIgnore. But worried of changing all the 100s of files which are already written.</p>
  
  <pre><code>ERROR StatusLogger Could not reconfigure JMX java.lang.LinkageError: loading constraint violation: loader "org/powermock/core/classloader/MockClassLoader@5fa95fa9" previously initiated loading for a different type with name "javax/management/MBeanServer" defined by loader "com/ibm/oti/vm/BootstrapClassLoader@7a5c7a5c".
  </code></pre>