3 Replies Latest reply on Jul 26, 2006 2:06 AM by jaikiran

    Simple injection of SessionContext not working

    jaikiran
    jaikiran Jul 25, 2006 3:36 AM

      I have just started with EJB3. Certainly, i am doing something wrong, because a simple injection is not working for me. I have StatelessSessionBean in which i am trying to inject the SessionContext. When i am trying to deploy the bean, server throws exceptions indicating a NullPointerException and subsequently the application is not deployed.

      Here's the code:

      package org.myapp.ejb;

import java.util.Random;

import javax.annotation.Resource;
import javax.annotation.security.PermitAll;
import javax.annotation.security.RolesAllowed;
import javax.ejb.SessionContext;
import javax.ejb.Stateless;
import javax.jms.Queue;

import org.jboss.annotation.security.SecurityDomain;

@Stateless
@SecurityDomain("other")
public class TestEJB3 implements TestEJB3Interface {

 @Resource
 SessionContext sessionContext;

 @PermitAll
 public void print() {
 System.out.println("Print Default: Hi");
 }

 @RolesAllowed({"Admin"})
 public String getDisplayValue() {
 return "Hi, user: " + new Random().nextInt();
 }

 @RolesAllowed({"AnyUser"})
 public void print(String text) {
 System.out.println("Print: " + text);
 }



}


      Here's the exception stacktrace when the application is being deployed:

      12:52:11,816 INFO [EARDeployer] Init J2EE application: file:/D:/JBoss4.0.4GCA/jboss-4.0.4.GA/server/default/deploy/MyEJB3.ear/
      12:52:12,160 INFO [Ejb3Deployment] EJB3 deployment time took: 188
      12:52:12,270 INFO [JmxKernelAbstraction] installing MBean: jboss.j2ee:ear=MyEJB3.ear,jar=myapp_ejb.jar,name=TestEJB3,service=EJB3 with dependencies:
      12:52:12,691 WARN [ServiceController] Problem starting service jboss.j2ee:ear=MyEJB3.ear,jar=myapp_ejb.jar,name=TestEJB3,service=EJB3
      java.lang.NullPointerException
      at org.jboss.ejb3.injection.ResourceHandler.loadFieldInjectors(ResourceHandler.java:283)       at org.jboss.ejb3.injection.ResourceHandler.loadInjectors(ResourceHandler.java:401)
      at org.jboss.ejb3.injection.ResourceHandler.loadInjectors(ResourceHandler.java:381)
      at org.jboss.ejb3.EJBContainer.resolveInjectors(EJBContainer.java:640)
      at org.jboss.ejb3.EJBContainer.initializePool(EJBContainer.java:576)
      at org.jboss.ejb3.EJBContainer.start(EJBContainer.java:507)
      at org.jboss.ejb3.SessionContainer.start(SessionContainer.java:82)
      at org.jboss.ejb3.stateless.StatelessContainer.start(StatelessContainer.java:80)
      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:585)
      at org.jboss.ejb3.ServiceDelegateWrapper.startService(ServiceDelegateWrapper.java:99)
      at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)
      at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)
      at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:585)
      at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
      at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
      at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
      at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)
      at $Proxy0.start(Unknown Source)
      at org.jboss.system.ServiceController.start(ServiceController.java:417)
      at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:585)
      at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
      at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
      at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
      at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
      at $Proxy56.start(Unknown Source)
      at org.jboss.ejb3.JmxKernelAbstraction.install(JmxKernelAbstraction.java:82)
      at org.jboss.ejb3.Ejb3Deployment.registerEJBContainer(Ejb3Deployment.java:439)
      at org.jboss.ejb3.Ejb3Deployment.start(Ejb3Deployment.java:486)
      at org.jboss.ejb3.Ejb3Module.startService(Ejb3Module.java:139)
      at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)
      at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)
      at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:585)
      at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
      at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
      at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
      at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)
      at $Proxy0.start(Unknown Source)
      at org.jboss.system.ServiceController.start(ServiceController.java:417)
      at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:585)
      at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
      at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
      at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
      at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
      at $Proxy29.start(Unknown Source)
      at org.jboss.ejb3.EJB3Deployer.start(EJB3Deployer.java:449)
      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:585)
      at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
      at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
      at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
      at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
      at org.jboss.mx.interceptor.DynamicInterceptor.invoke(DynamicInterceptor.java:97)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
      at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
      at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
      at $Proxy30.start(Unknown Source)
      at org.jboss.deployment.MainDeployer.start(MainDeployer.java:1007)
      at org.jboss.deployment.MainDeployer.start(MainDeployer.java:997)
      at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:808)
      at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:771)
      at sun.reflect.GeneratedMethodAccessor49.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:585)
      at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
      at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
      at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
      at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
      at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
      at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
      at $Proxy8.deploy(Unknown Source)
      at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:421)
      at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:634)
      at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:263)
      at org.jboss.deployment.scanner.AbstractDeploymentScanner.startService(AbstractDeploymentScanner.java:336)
      at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)
      at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)
      at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:585)
      at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
      at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
      at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
      at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)
      at $Proxy0.start(Unknown Source)
      at org.jboss.system.ServiceController.start(ServiceController.java:417)
      at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:585)
      at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
      at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
      at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
      at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
      at $Proxy4.start(Unknown Source)
      at org.jboss.deployment.SARDeployer.start(SARDeployer.java:302)
      at org.jboss.deployment.MainDeployer.start(MainDeployer.java:1007)
      at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:808)
      at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:771)
      at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:755)
      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:585)
      at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
      at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
      at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
      at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
      at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
      at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
      at $Proxy5.deploy(Unknown Source)
      at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:482)
      at org.jboss.system.server.ServerImpl.start(ServerImpl.java:362)
      at org.jboss.Main.boot(Main.java:200)
      at org.jboss.Main$1.run(Main.java:464)
      at java.lang.Thread.run(Thread.java:595)
      12:52:13,457 INFO [EJB3Deployer] Deployed: file:/D:/JBoss4.0.4GCA/jboss-4.0.4.GA/server/default/deploy/MyEJB3.ear/myapp_ejb.jar/
      12:52:13,473 INFO [TomcatDeployer] deploy, ctxPath=/myapp, warUrl=.../deploy/MyEJB3.ear/myapp_web.war/
      12:52:13,770 INFO [EARDeployer] Started J2EE application: file:/D:/JBoss4.0.4GCA/jboss-4.0.4.GA/server/default/deploy/MyEJB3.ear/
      12:52:13,785 ERROR [URLDeploymentScanner] Incomplete Deployment listing:

      --- MBeans waiting for other MBeans ---
      ObjectName: jboss.j2ee:ear=MyEJB3.ear,jar=myapp_ejb.jar,name=TestEJB3,service=EJB3
      State: FAILED
      Reason: java.lang.NullPointerException

      --- MBEANS THAT ARE THE ROOT CAUSE OF THE PROBLEM ---
      ObjectName: jboss.j2ee:ear=MyEJB3.ear,jar=myapp_ejb.jar,name=TestEJB3,service=EJB3
      State: FAILED
      Reason: java.lang.NullPointerException


      I am using JBoss - 4.0.4 GCA. I followed the following steps after installing the server:

      1) I downloaded jboss-EJB-3.0_RC8-FD
      2) Copied ejb3-persistence.jar in server/default/lib
      3) Copied ejb3-interceptors-aop.xml in server/default/deploy
      4) ejb3.deployer in server/default/deploy

      Is there something else, i need to do to get injection working? Note that with the injection part commented out, everything works fine, the EJB gets deployed and i am able to invoke methods on the EJB.





      • 21501 Views
      • Tags:
        • 1. Re: Simple injection of SessionContext not working
          jaikiran
          jaikiran Jul 25, 2006 6:58 AM (in response to jaikiran)

          Downloaded the source code of JBoss-4.0.4 GCA and after debugging found that the culprit was the following statement in ResourceHandler.java of JBoss:

          Line number: 283

          if (!ref.type().equals(Object.class))


          ref.type() returns null and the subsequent call to equals method throws a NullpointerException.

          Surprisingly, this is a very simple injection and i have seen this type of injection being used in the EJB3 Trail.

          I even tried moving the annotation to method level: 

          @Resource
 public void setSessionContext(SessionContext sessionCtx) {
 System.out.println("Setting the session context: " + sessionCtx);
 this.sessionContext = sessionCtx;
 }


          Even in this case i get the NullPointerException. This time at:

          java.lang.NullPointerException
          at org.jboss.ejb3.injection.ResourceHandler.loadMethodInjectors(ResourceHandler.java:183)


          The reason is the same as mentioned above, this time in the loadMethodInjectors method.

          Am i doing something wrong? Cant believe that this simple injection fails.


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          • 2. Re: Simple injection of SessionContext not working
            epbernard
            epbernard Jul 25, 2006 5:27 PM (in response to jaikiran)

            open a JIRA issue please, NPE should not occurs

              • Actions
            • 3. Re: Simple injection of SessionContext not working
              jaikiran
              jaikiran Jul 26, 2006 2:06 AM (in response to jaikiran)

              JIRA http://jira.jboss.com/jira/browse/EJBTHREE-664 created.

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