I have added 2 tasts to make sure that call OpenMBean*InfoSupport.equals/hashCode do not throw NPE The unit tests and JCK tests are passed. Webrev: http://cr.openjdk.java.net/~sjiang/JDK-8023529/00/ Bug: https://bugs.openjdk.java.net/browse/JDK-8023529 Thanks, Shanliang