[infinispan-issues] [JBoss JIRA] Resolved: (ISPN-890) NullPointerException when merging views

NullPointerException when merging views --------------------------------------- Key: ISPN-890 URL: https://issues.jboss.org/browse/ISPN-890 Project: Infinispan Issue Type: Bug Components: RPC Affects Versions: 4.2.0.Final Reporter: Mircea Markus Assignee: Manik Surtani Priority: Critical Labels: jgroups, network_partition, split_brain Fix For: 4.2.1.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.