4 Replies Latest reply on Jan 5, 2012 6:36 AM by Periklis Douvitsas

    How to inject EJB3 session bean into another session bean with JBoss 6

    Giorgos Stamateris Newbie

      I'm trying to migrate a project from JBoss 4 to JBoss 6. The project consists of an EJB 3 backend and a MyFaces 1.1.4 frontend. I have included the MyFaces 1.1.4 libraries in the JBoss 6 jsf deployer.

       

      I have a call from the frontend to a backend function through a helper class.

       

      PatientControllerEJB patientModule = BusinessHelper.getPatientServices(); 

      patientModule.canCreatePatVisit( getUserContainer().getClientId(), patId, vType);

       

       

      After that call I get a NullPointerException at the backend canCreatePatVisit function, in the session bean patientModule.

       

       

      @Stateless

      public class PatientControllerEJBBean extends ASBusinessLogicClass implements PatientControllerEJBLocal, PatientControllerEJBRemote {

          @Resource private SessionContext sessionCtx = null;

       

       

          @PersistenceContext(unitName="amedPU") EntityManager em;

          @EJB private AdminControllerEJBLocal admContr;

          @EJB private ConfigControllerEJBLocal confContr;

       

          ...

       

          public void canCreatePatVisit(int clientId, int patId, int visitTypeId) throws ValidationException {

              IVisitType vt = admContr.getVisitType(visitTypeId);

       

              ...

       

          }      

       

          ...

       

      }

       

       

      I debugged the project and I found out that em, admContr and confContr are all null. So I suppose there is a problem injecting a session bean in another session bean but I don't know what.

       

      I have changed the web.xml version to 2.5 in the frontend and I am using the JBoss 6 libraries. Any help would be appreciated.

       

      I'm including a portion of the stacktrace below in case it might be helpful.

       

      Caused by: javax.ejb.EJBException: java.lang.NullPointerException

        at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.handleExceptionInOurTx(CMTTxInterceptor.java:183)

        at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:251)

        at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.required(CMTTxInterceptor.java:349)

        at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.invoke(CMTTxInterceptor.java:209)

        at org.jboss.ejb3.tx2.aop.CMTTxInterceptorWrapper.invoke(CMTTxInterceptorWrapper.java:52)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:182)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:67)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.core.context.CurrentInvocationContextInterceptor.invoke(CurrentInvocationContextInterceptor.java:47)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.interceptor.EJB3TCCLInterceptor.invoke(EJB3TCCLInterceptor.java:86)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:392)

        at org.jboss.ejb3.remoting.IsLocalInterceptor.invokeLocal(IsLocalInterceptor.java:88)

        at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:75)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.async.impl.interceptor.AsynchronousClientInterceptor.invoke(AsynchronousClientInterceptor.java:143)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)

        at $Proxy404.invoke(Unknown Source)

        at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:185)

        at $Proxy407.canCreatePatVisit(Unknown Source)

        at com.atkosoft.cm.faces.patient.NewVisitForm.initFormWithMenuId(NewVisitForm.java:225)

        at com.atkosoft.cm.faces.patient.PatientSearchForm.goToDestination(PatientSearchForm.java:1302)

        ... 52 more

      Caused by: java.lang.NullPointerException

        at com.atkosoft.cm.patient.bizlogic.PatientControllerEJBBean.canCreatePatVisit(PatientControllerEJBBean.java:1856)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

        at java.lang.reflect.Method.invoke(Unknown Source)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeTarget(MethodInvocation.java:122)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:111)

        at org.jboss.ejb3.interceptors.container.ContainerMethodInvocationWrapper.invokeNext(ContainerMethodInvocationWrapper.java:72)

        at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.invoke(InterceptorSequencer.java:76)

        at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.aroundInvoke(InterceptorSequencer.java:62)

        at sun.reflect.GeneratedMethodAccessor568.invoke(Unknown Source)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

        at java.lang.reflect.Method.invoke(Unknown Source)

        at org.jboss.aop.advice.PerJoinpointAdvice.invoke(PerJoinpointAdvice.java:174)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.fillMethod(InvocationContextInterceptor.java:74)

        at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_fillMethod_476205266.invoke(InvocationContextInterceptor_z_fillMethod_476205266.java)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.setup(InvocationContextInterceptor.java:90)

        at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_setup_476205266.invoke(InvocationContextInterceptor_z_setup_476205266.java)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.async.impl.interceptor.AsynchronousServerInterceptor.invoke(AsynchronousServerInterceptor.java:128)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:62)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:56)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:68)

        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)

        at org.jboss.ejb3.core.context.SessionInvocationContextAdapter.proceed(SessionInvocationContextAdapter.java:95)

        at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:247)

        ... 84 more