[infinispan-issues] [JBoss JIRA] Commented: (ISPN-890) NPE in JGroupsTransport

[Mircea Markus (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12577712#comment-12577712 ] 

Mircea Markus commented on ISPN-890:
------------------------------------

Also raised on the user forums: http://community.jboss.org/message/582908#582908

> NPE in JGroupsTransport
> -----------------------
>
>                 Key: ISPN-890
>                 URL: https://issues.jboss.org/browse/ISPN-890
>             Project: Infinispan
>          Issue Type: Bug
>          Components: State transfer
>    Affects Versions: 4.2.0.Final
>            Reporter: Mircea Markus
>            Assignee: Manik Surtani
>            Priority: Critical
>             Fix For: 4.2.1.Final, 5.0.0.Final
>
>
> NPR is thrown in the following method of JGroupsTransport:
>    private boolean needsToRejoin(View v) {
>       if (v instanceof MergeView) {
>          MergeView mv = (MergeView) v;
>          org.jgroups.Address coord = v.getMembers().get(0);
>          View winningPartition = null;
>          for (View p : mv.getSubgroups()) {
>             if (p.getMembers().get(0).equals(coord)) {
>                winningPartition = p;
>                break;
>             }
>          }
>          if (!winningPartition.containsMember(channel.getAddress())) return true; //!!! here is where NPE is thrown
>       }
>       return false;
>    }
> Here is the stack:
> 2011-01-24 15:14:01,842 ERROR [org.jgroups.protocols.pbcast.NAKACK] (Incoming-1,Infinispan-Cluster,NodeE-9505) couldn't deliver message [dst: <null>, src: NodeE-9505 (3 headers), size=0 bytes]
> java.lang.NullPointerException
>         at org.infinispan.remoting.transport.jgroups.JGroupsTransport.needsToRejoin(JGroupsTransport.java:521)
>         at org.infinispan.remoting.transport.jgroups.JGroupsTransport.access$000(JGroupsTransport.java:88)
>         at org.infinispan.remoting.transport.jgroups.JGroupsTransport$NotifyMerge.emitNotification(JGroupsTransport.java:465)
>         at org.infinispan.remoting.transport.jgroups.JGroupsTransport.viewAccepted(JGroupsTransport.java:502)
>         at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.handleUpEvent(MessageDispatcher.java:728)
>         at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.up(MessageDispatcher.java:771)
>         at org.jgroups.JChannel.up(JChannel.java:1466)
>         at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:953)
>         at org.jgroups.protocols.pbcast.FLUSH.up(FLUSH.java:440)
>         at org.jgroups.protocols.pbcast.STREAMING_STATE_TRANSFER.up(STREAMING_STATE_TRANSFER.java:262)
>         at org.jgroups.protocols.FRAG2.up(FRAG2.java:189)
>         at org.jgroups.protocols.FC.up(FC.java:502)
>         at org.jgroups.protocols.pbcast.GMS.installView(GMS.java:596)
>         at org.jgroups.protocols.pbcast.CoordGmsImpl.handleViewChange(CoordGmsImpl.java:243)
>         at org.jgroups.protocols.pbcast.GMS.up(GMS.java:796)
>         at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:233)
>         at org.jgroups.protocols.UNICAST.up(UNICAST.java:309)
>         at org.jgroups.protocols.pbcast.NAKACK.handleMessage(NAKACK.java:842)
>         at org.jgroups.protocols.pbcast.NAKACK.up(NAKACK.java:675)
>         at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:131)
>         at org.jgroups.protocols.FD.up(FD.java:265)
>         at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:268)
>         at org.jgroups.protocols.MERGE2.up(MERGE2.java:209)
>         at org.jgroups.protocols.Discovery.up(Discovery.java:291)
>         at org.jgroups.protocols.TP.passMessageUp(TP.java:1092)
>         at org.jgroups.protocols.TP$3.run(TP.java:1016)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:680)
> Seems like winningPartition might be null in the method. This fails in 1/50 runs of StateTransferFunctionalTest. 

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