[infinispan-issues] [JBoss JIRA] (ISPN-3873) Race condition in AbstractInvocationContextFactory (results in NullPointerException in EquivalentHashMap when receiving an invalidate command during startup)

[Karl von Randow (JIRA)]

Karl von Randow created ISPN-3873:
-------------------------------------

             Summary: Race condition in AbstractInvocationContextFactory (results in NullPointerException in EquivalentHashMap when receiving an invalidate command during startup)
                 Key: ISPN-3873
                 URL: https://issues.jboss.org/browse/ISPN-3873
             Project: Infinispan
          Issue Type: Bug
          Components: Core API
    Affects Versions: 6.0.1.Final
         Environment: Ubuntu Linux 12.04_LTS, Oracle Java SE 1.7.0_45
            Reporter: Karl von Randow
            Assignee: Mircea Markus


Sometimes when I start one server in a cluster I see the NullPointerException reproduced below. This only occurs if there is another server running. I run multiple caches with clustering using invalidation. JGroups using JDBC_PING and TCP. The caches are non-transactional.

The NPE is because the keyEq (Equivalence instance for keys) is null. I believe this is because the command is processed before the start() method has been called on the AbstractInvocationContextFactory, as the start() method sets the keyEq ivar.

At this point I'm not sure how to fix it!

java.lang.NullPointerException
        at org.infinispan.commons.equivalence.EquivalentHashMap.put(EquivalentHashMap.java:176)
        at org.infinispan.commons.equivalence.EquivalentHashSet.add(EquivalentHashSet.java:109)
        at org.infinispan.context.impl.NonTxInvocationContext.addLockedKey(NonTxInvocationContext.java:84)
        at org.infinispan.util.concurrent.locks.LockManagerImpl.lock(LockManagerImpl.java:190)
        at org.infinispan.util.concurrent.locks.LockManagerImpl.acquireLockNoCheck(LockManagerImpl.java:181)
        at org.infinispan.interceptors.locking.AbstractLockingInterceptor.lockKey(AbstractLockingInterceptor.java:149)
        at org.infinispan.interceptors.locking.AbstractLockingInterceptor.visitInvalidateCommand(AbstractLockingInterceptor.java:85)
        at org.infinispan.commands.write.InvalidateCommand.acceptVisitor(InvalidateCommand.java:118)
        at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:98)
        at org.infinispan.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:112)
        at org.infinispan.commands.AbstractVisitor.visitInvalidateCommand(AbstractVisitor.java:111)
        at org.infinispan.commands.write.InvalidateCommand.acceptVisitor(InvalidateCommand.java:118)
        at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:98)
        at org.infinispan.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:112)
        at org.infinispan.commands.AbstractVisitor.visitInvalidateCommand(AbstractVisitor.java:111)
        at org.infinispan.commands.write.InvalidateCommand.acceptVisitor(InvalidateCommand.java:118)
        at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:98)
        at org.infinispan.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:110)
        at org.infinispan.interceptors.InvocationContextInterceptor.handleDefault(InvocationContextInterceptor.java:73)
        at org.infinispan.commands.AbstractVisitor.visitInvalidateCommand(AbstractVisitor.java:111)
        at org.infinispan.commands.write.InvalidateCommand.acceptVisitor(InvalidateCommand.java:118)
        at org.infinispan.interceptors.InterceptorChain.invoke(InterceptorChain.java:333)
        at org.infinispan.commands.remote.BaseRpcInvokingCommand.processVisitableCommand(BaseRpcInvokingCommand.java:39)
        at org.infinispan.commands.remote.SingleRpcCommand.perform(SingleRpcCommand.java:48)
        at org.infinispan.remoting.InboundInvocationHandlerImpl.handleInternal(InboundInvocationHandlerImpl.java:95)
        at org.infinispan.remoting.InboundInvocationHandlerImpl.handleWithWaitForBlocks(InboundInvocationHandlerImpl.java:186)
        at org.infinispan.remoting.InboundInvocationHandlerImpl.handle(InboundInvocationHandlerImpl.java:84)
        at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.executeCommandFromLocalCluster(CommandAwareRpcDispatcher.java:259)
        at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.handle(CommandAwareRpcDispatcher.java:211)
        at org.jgroups.blocks.RequestCorrelator.handleRequest(RequestCorrelator.java:460)
        at org.jgroups.blocks.RequestCorrelator.receiveMessage(RequestCorrelator.java:377)
        at org.jgroups.blocks.RequestCorrelator.receive(RequestCorrelator.java:247)
        at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.up(MessageDispatcher.java:665)
        at org.jgroups.JChannel.up(JChannel.java:730)
        at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:1019)
        at org.jgroups.protocols.FRAG2.up(FRAG2.java:182)
        at org.jgroups.protocols.FlowControl.up(FlowControl.java:434)
        at org.jgroups.protocols.FlowControl.up(FlowControl.java:434)
        at org.jgroups.stack.Protocol.up(Protocol.java:409)
        at org.jgroups.stack.Protocol.up(Protocol.java:409)
        at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:294)
        at org.jgroups.protocols.RSVP.up(RSVP.java:221)
        at org.jgroups.protocols.UNICAST2.removeAndPassUp(UNICAST2.java:919)
        at org.jgroups.protocols.UNICAST2.handleDataReceived(UNICAST2.java:800)
        at org.jgroups.protocols.UNICAST2.up(UNICAST2.java:415)
        at org.jgroups.protocols.pbcast.NAKACK2.up(NAKACK2.java:600)
        at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:147)
        at org.jgroups.protocols.FD.up(FD.java:255)
        at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:301)
        at org.jgroups.protocols.MERGE2.up(MERGE2.java:209)
        at org.jgroups.protocols.Discovery.up(Discovery.java:379)
        at org.jgroups.protocols.TP.passMessageUp(TP.java:1399)
        at org.jgroups.protocols.TP$MyHandler.run(TP.java:1585)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:744)


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