[infinispan-issues] [JBoss JIRA] Created: (ISPN-696) NPE during state transfer after restarting cache

[Paul Ferraro (JIRA)]

NPE during state transfer after restarting cache
------------------------------------------------

                 Key: ISPN-696
                 URL: https://jira.jboss.org/browse/ISPN-696
             Project: Infinispan
          Issue Type: Bug
          Components: State transfer
    Affects Versions: 4.2.0.ALPHA2
            Reporter: Paul Ferraro
            Assignee: Manik Surtani


When a named cache is restarted, and fetchInMemoryState = true, the state transfer initiated in StateTransferManager.start() causes a NPE, because the cache's ComponentRegistry does not get reregistered with the GlobalComponentRegistry.

The NPE comes from InboundInvocationHandlerImpl:

   public void applyState(String cacheName, InputStream i) throws StateTransferException {
      getStateTransferManager(cacheName).applyState(i);
   }

   private StateTransferManager getStateTransferManager(String cacheName) throws StateTransferException {
      ComponentRegistry cr = gcr.getNamedComponentRegistry(cacheName);
      if (cr == null) {
         return null;
      }
      return cr.getComponent(StateTransferManager.class);
   }

A quick glance at ComponentRegistry indicates that the registry is registered with the GlobalComponentRegistry during in the constructor and unregistered on stop().  Because of this unbalanced registration, when the stopped component registry is restarted, it never get re-registered with the GlobalComponentRegistry, hence the NPE during state transfer the second time around.

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