[jboss-dev-forums] [EJB3 Development] - How to inject EJB3 session bean into another session bean with JBoss 6

Thu Jun 23 06:18:39 EDT 2011

Giorgos Stamateris [http://community.jboss.org/people/g_stam] created the discussion

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

To view the discussion, visit: http://community.jboss.org/message/611580#611580

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I'm trying to migrate a project from JBoss 4.0.4 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 moreCaused 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
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