Program: 43771
Project: 43771
Buggy source:
private void initLevelStuff() throws ClassNotFoundException, NoSuchFieldException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {
  logClass=Class.forName(LOG4J_CLASS_NAME,true,Thread.currentThread().getContextClassLoader());
  log4jMirror=Mirror.me(logClass);
  getLogger=log4jMirror.findMethod("String_Node_Str",String.class);
  Mirror<?> levelMirror=Mirror.me(Thread.currentThread().getContextClassLoader().loadClass("String_Node_Str"));
  levelFatal=levelMirror.getField("String_Node_Str").get(log4jImpl);
  levelError=levelMirror.getField("String_Node_Str").get(log4jImpl);
  levelWarn=levelMirror.getField("String_Node_Str").get(log4jImpl);
  levelInfo=levelMirror.getField("String_Node_Str").get(log4jImpl);
  levelDebug=levelMirror.getField("String_Node_Str").get(log4jImpl);
  levelTrace=levelMirror.getField("String_Node_Str").get(log4jImpl);
  isEnabledFor=log4jMirror.findMethod("String_Node_Str",levelMirror.getType());
  fatalObjectMethod=findMethod("String_Node_Str");
  fatalObjectThrowableMethod=findMethod_Throw("String_Node_Str");
  errorObjectMethod=findMethod("String_Node_Str");
  errorObjectThrowableMethod=findMethod_Throw("String_Node_Str");
  warnObjectMethod=findMethod("String_Node_Str");
  warnObjectThrowableMethod=findMethod_Throw("String_Node_Str");
  infoObjectMethod=findMethod("String_Node_Str");
  infoObjectThrowableMethod=findMethod_Throw("String_Node_Str");
  debugObjectMethod=findMethod("String_Node_Str");
  debugObjectThrowableMethod=findMethod_Throw("String_Node_Str");
  traceObjectMethod=findMethod("String_Node_Str");
  traceObjectThrowableMethod=findMethod_Throw("String_Node_Str");
}

Fixed version (ground truth):
private void initLevelStuff() throws ClassNotFoundException, NoSuchFieldException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {
  logClass=Class.forName(LOG4J_CLASS_NAME,true,Thread.currentThread().getContextClassLoader());
  log4jMirror=Mirror.me(logClass);
  getLogger=log4jMirror.findMethod("String_Node_Str",String.class);
  Mirror<?> levelMirror=Mirror.me(Thread.currentThread().getContextClassLoader().loadClass("String_Node_Str"));
  levelFatal=levelMirror.getField("String_Node_Str").get(log4jImpl);
  levelError=levelMirror.getField("String_Node_Str").get(log4jImpl);
  levelWarn=levelMirror.getField("String_Node_Str").get(log4jImpl);
  levelInfo=levelMirror.getField("String_Node_Str").get(log4jImpl);
  levelDebug=levelMirror.getField("String_Node_Str").get(log4jImpl);
  isEnabledFor=log4jMirror.findMethod("String_Node_Str",levelMirror.getType());
  fatalObjectMethod=findMethod("String_Node_Str");
  fatalObjectThrowableMethod=findMethod_Throw("String_Node_Str");
  errorObjectMethod=findMethod("String_Node_Str");
  errorObjectThrowableMethod=findMethod_Throw("String_Node_Str");
  warnObjectMethod=findMethod("String_Node_Str");
  warnObjectThrowableMethod=findMethod_Throw("String_Node_Str");
  infoObjectMethod=findMethod("String_Node_Str");
  infoObjectThrowableMethod=findMethod_Throw("String_Node_Str");
  debugObjectMethod=findMethod("String_Node_Str");
  debugObjectThrowableMethod=findMethod_Throw("String_Node_Str");
  try {
    levelTrace=levelMirror.getField("String_Node_Str").get(log4jImpl);
    traceObjectMethod=findMethod("String_Node_Str");
    traceObjectThrowableMethod=findMethod_Throw("String_Node_Str");
  }
 catch (  Throwable e) {
  }
}