[jboss-user] [EJB 3.0] - NullpointerException when calling getDelegate() on injected

[mugwump]

I've got a stateless SessionBean with an injected PersistenceContext using:


  | @PersistenceContext
  | private EntityManager em;
  | 

I now try to get a handle to the underlying EntityManagerFactory using

em.getDelegate()

which throws a lengthy NullPointerException. I am calling this in @PostConstruct and I checked, that the EntityManager is really not null - so the NPE comes from somewhere deeper: 


  | java.lang.RuntimeException: java.lang.NullPointerException
  | 	at org.jboss.ejb3.interceptor.LifecycleInterceptorHandler.postConstruct(LifecycleInterceptorHandler.java:109)
  | 	at org.jboss.ejb3.EJBContainer.invokePostConstruct(EJBContainer.java:582)
  | 	at org.jboss.ejb3.AbstractPool.create(AbstractPool.java:108)
  | 	at org.jboss.ejb3.ThreadlocalPool.get(ThreadlocalPool.java:48)
  | 	at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:54)
  | 	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:78)
  | 	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
  | 	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
  | 	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:227)
  | 	at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106)
  | 	at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
  | 	at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:828)
  | 	at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:681)
  | 	at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:358)
  | 	at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:398)
  | 	at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:239)
  | Caused by: java.lang.NullPointerException
  | 	at org.jboss.ejb3.entity.ManagedEntityManagerFactory.getNonTxEntityManager(ManagedEntityManagerFactory.java:58)
  | 	at org.jboss.ejb3.entity.ManagedEntityManagerFactory.getTransactionScopedEntityManager(ManagedEntityManagerFactory.java:163)
  | 	at org.jboss.ejb3.entity.TransactionScopedEntityManager.getDelegate(TransactionScopedEntityManager.java:79)
  | 	at de.vierundsechzig.springer.kompendium.compass.CompassProvider.initializeCompass(CompassProvider.java:79)
  | 	at org.jboss.ejb3.interceptor.LifecycleInvocationContextImpl.proceed(LifecycleInvocationContextImpl.java:159)
  | 	at org.jboss.ejb3.interceptor.LifecycleInterceptorHandler.postConstruct(LifecycleInterceptorHandler.java:105)
  | 	at org.jboss.ejb3.EJBContainer.invokePostConstruct(EJBContainer.java:582)
  | 	at org.jboss.ejb3.AbstractPool.create(AbstractPool.java:108)
  | 	at org.jboss.ejb3.ThreadlocalPool.get(ThreadlocalPool.java:48)
  | 	at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:54)
  | 	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:78)
  | 	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
  | 	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
  | 	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:227)
  | 	at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106)
  | 	at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
  | 	at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:828)
  | 	at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:681)
  | 	at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:358)
  | 	at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:398)
  | 	at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:239)
  | 	at org.jboss.remoting.RemoteClientInvoker.invoke(RemoteClientInvoker.java:190)
  | 	at org.jboss.remoting.Client.invoke(Client.java:525)
  | 	at org.jboss.remoting.Client.invoke(Client.java:488)
  | 	at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:55)
  | 	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
  | 	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:55)
  | 	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:78)
  | 	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:102)
  | 	at $Proxy6.getResults(Unknown Source)
  | 	at de.vierundsechzig.springer.kompendium.test.PersistenceManagerTests.testSearch(PersistenceManagerTests.java:71)
  | ... Removed 21 stack frames
  | 

Does anyone have an idea, where this NPE comes from?! 
cheers&thx
stf

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