[infinispan-issues] [JBoss JIRA] Created: (ISPN-779) DefaultCacheManager.removeListener throwing NPE when server stopped

[Galder Zamarreño (JIRA)]

DefaultCacheManager.removeListener throwing NPE when server stopped
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                 Key: ISPN-779
                 URL: https://jira.jboss.org/browse/ISPN-779
             Project: Infinispan
          Issue Type: Bug
          Components: Cache Server
            Reporter: Galder Zamarreño
            Assignee: Galder Zamarreño
             Fix For: 4.2.0.CR1


I'm seeing a NPE when Memcached server shutdowns:

Exception in thread "Thread-2" java.lang.RuntimeException: Exception encountered in shutting down the server
	at org.infinispan.server.core.ShutdownHook.run(Main.scala:239)
Caused by: java.util.concurrent.ExecutionException: org.infinispan.CacheException: Unable to invoke method private void org.infinispan.transaction.xa.TransactionTable.stop() on object 
	at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
	at java.util.concurrent.FutureTask.get(FutureTask.java:83)
	at org.infinispan.server.core.ShutdownHook.run(Main.scala:235)
Caused by: org.infinispan.CacheException: Unable to invoke method private void org.infinispan.transaction.xa.TransactionTable.stop() on object 
	at org.infinispan.util.ReflectionUtil.invokeAccessibly(ReflectionUtil.java:173)
	at org.infinispan.factories.AbstractComponentRegistry$PrioritizedMethod.invoke(AbstractComponentRegistry.java:861)
	at org.infinispan.factories.AbstractComponentRegistry.internalStop(AbstractComponentRegistry.java:709)
	at org.infinispan.factories.AbstractComponentRegistry.stop(AbstractComponentRegistry.java:603)
	at org.infinispan.factories.ComponentRegistry.stop(ComponentRegistry.java:166)
	at org.infinispan.CacheDelegate.stop(CacheDelegate.java:325)
	at org.infinispan.manager.DefaultCacheManager.stop(DefaultCacheManager.java:521)
	at org.infinispan.server.core.ShutdownHook$$anon$5.call(Main.scala:230)
	at org.infinispan.server.core.ShutdownHook$$anon$5.call(Main.scala:226)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	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)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.infinispan.util.ReflectionUtil.invokeAccessibly(ReflectionUtil.java:170)
	... 13 more
Caused by: java.lang.NullPointerException
	at org.infinispan.manager.DefaultCacheManager.removeListener(DefaultCacheManager.java:541)
	at org.infinispan.transaction.xa.TransactionTable.stop(TransactionTable.java:87)
	... 18 more

The origin seems to be in ISPN-771

Maybe since transaction table now removes the listener, it needs to stop *before* the cache manager notifier does? 

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