This issue is also in AS7.

Cloned from JBPAPP-6137:
Hi Clebert,
I hit NullPointerException when dedicated backup server was shutting down after clean shutdown command. Live server was stopped (clean shutdown too) several seconds before backup server. It seems that backup tried to take its role. NullPointerException is ugly and it should not occur.

I am putting it on minor priority.
Thank you.

10:42:42,071 INFO [ClusterManagerImpl] announcing backup
10:42:42,072 INFO [HornetQServerImpl] HornetQ Backup Server version 2.2.1.GA (Zmmmmmmmm, 121) [e9d8059a-5140-11e0-8830-005056c00008] started, waiting live to fail before it gets active
10:42:49,387 INFO [ClusterManagerImpl] backup announced
^C10:51:03,362 INFO [ServerImpl] Runtime shutdown hook called, forceHalt: true
10:51:03,423 WARN [RemotingConnectionImpl] Connection failure has been detected: The connection was disconnected because of server shutdown [code=4]
10:51:03,628 WARN [ClientSessionFactoryImpl] Failed to connect to server.
10:51:03,634 SEVERE [HornetQServerImpl] Failure in initialisation
java.lang.NullPointerException
at org.hornetq.core.server.impl.HornetQServerImpl.initialisePart2(HornetQServerImpl.java:1436)
at org.hornetq.core.server.impl.HornetQServerImpl.access$100(HornetQServerImpl.java:130)
at org.hornetq.core.server.impl.HornetQServerImpl$SharedStoreBackupActivation.run(HornetQServerImpl.java:398)
at java.lang.Thread.run(Thread.java:636)
10:51:04,634 INFO [HornetQServerImpl] HornetQ Server version 2.2.1.GA (Zmmmmmmmm, 121) [e9d8059a-5140-11e0-8830-005056c00008] stopped