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

[Galder Zamarreño (JIRA)]

     [ https://jira.jboss.org/browse/ISPN-696?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Galder Zamarreño reassigned ISPN-696:
-------------------------------------

    Assignee: Galder Zamarreño  (was: Manik Surtani)


> 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: Galder Zamarreño
>
> 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 in the constructor and unregistered in stop().  Because of the unbalanced logic, when the stopped component registry is restarted, it never gets re-registered with the GlobalComponentRegistry, hence the NPE during state transfer the second time around.
> This specific regression was introduced in revision 2384.  Rolling back ComponentRegistry.java to revision 2273 resolves the issue.

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