[jboss-jira] [JBoss JIRA] Created: (JBAS-5068) Possible NullPointerException in DistributedReplicantManager#_add()

[Takayoshi Kimura (JIRA)]

Possible NullPointerException in DistributedReplicantManager#_add()
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                 Key: JBAS-5068
                 URL: http://jira.jboss.com/jira/browse/JBAS-5068
             Project: JBoss Application Server
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: Clustering
    Affects Versions: JBossAS-4.2.2.GA, JBossAS-4.2.1.GA, JBossAS-4.2.0.GA
            Reporter: Takayoshi Kimura
         Assigned To: Brian Stansberry
            Priority: Minor


DistributedReplicantManager#_add() can be called before
asynchHandler initialization when multiple nodes starts
simultaneously. It results NullPointerException below:

2007-11-09 20:40:17,315 ERROR [org.jboss.ha.framework.server.DistributedReplicantManagerImpl.DefaultPartition] _add failed
java.lang.NullPointerException
	at org.jboss.ha.framework.server.DistributedReplicantManagerImpl._add(DistributedReplicantManagerImpl.java:622)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.jgroups.blocks.MethodCall.invoke(MethodCall.java:330)
	at org.jboss.ha.framework.server.HAPartitionImpl.handle(HAPartitionImpl.java:1126)
	at org.jgroups.blocks.RequestCorrelator.handleRequest(RequestCorrelator.java:654)
	at org.jgroups.blocks.RequestCorrelator.receiveMessage(RequestCorrelator.java:544)
	at org.jgroups.blocks.RequestCorrelator.receive(RequestCorrelator.java:367)
	at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.up(MessageDispatcher.java:777)
	at org.jgroups.JChannel.up(JChannel.java:1091)

Impact:

Nothing so far, just appearing the ERROR log above.

To reproduce this:

It's very hard to reproduce.

Insert Thread.sleep() call before asynchHandler initialization in
DistributedReplicantManager#start() and boot multiple nodes
simultaneously.

DistributedReplicantManager#start():
      // Create the asynch listener handler thread
      Thread.sleep(10000);
      asynchHandler = new AsynchEventHandler(this, "AsynchKeyChangeHandler");
      asynchHandler.start();

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