jmx-dev Codereview request for JDK-8023669: MBean*Info.hashCode : NPE

[shanliang]

Hi,

Please review following fix, it addresses the issue only in the method 
"hashCode":
   bug: https://bugs.openjdk.java.net/browse/JDK-8023669
   webrev: http://cr.openjdk.java.net/~sjiang/jdk-8023669/00/
Thanks,
Shanliang