Exception in creating message-driven ejb : [java.lang.NullPointerException]

Question

[#|2008-09-17T07:32:06.973-0500|SEVERE|sun-appserver-ee8.2|javax.enterprise.system.container.ejb.mdb|_ThreadID=58;|MDB00050: Message-driven bean [OAHMSTcpIpServer1:eaTCPIP_cmTcpIpServer_Service1]: Exception in creating message-driven ejb : [java.lang.NullPointerException]|#]
[#|2008-09-17T07:32:06.974-0500|SEVERE|sun-appserver-ee8.2|javax.enterprise.system.container.ejb.mdb|_ThreadID=58;|java.lang.NullPointerException
java.lang.NullPointerException
     at com.sun.enterprise.util.InvocationManagerImpl.preInvoke(InvocationManagerImpl.java:117)
     at com.sun.ejb.containers.MessageBeanContainer.createMessageDrivenEJB(MessageBeanContainer.java:670)
     at com.sun.ejb.containers.MessageBeanContainer.access$100(MessageBeanContainer.java:71)
     at com.sun.ejb.containers.MessageBeanContainer$MessageBeanContextFactory.create(MessageBeanContainer.java:467)
     at com.sun.ejb.containers.util.pool.NonBlockingPool.preload(NonBlockingPool.java:249)
     at com.sun.ejb.containers.util.pool.NonBlockingPool.doResize(NonBlockingPool.java:473)
     at com.sun.ejb.containers.util.pool.NonBlockingPool$IdleBeanWork.run(NonBlockingPool.java:568)
     at com.sun.ejb.containers.util.pool.NonBlockingPool$IdleBeanWork.service(NonBlockingPool.java:560)
     at com.sun.ejb.containers.util.WorkAdapter.doWork(WorkAdapter.java:44)
     at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:409)
|#]

Answer 1

Hello,
If I make use of the @EJB annotation again a NullPointerException is risen
package videoclub;
import java.awt.Component;
import java.awt.Container;
import java.awt.FocusTraversalPolicy;
import java.util.Vector;
import javax.annotation.Resource;
import javax.ejb.EJB;
import javax.swing.JOptionPane;
import vc.bl.ClerkSessionRemote;
import vc.domain.Customer;
* @author IOANNIS_PAPAIOANNOU
@EJB(name="ejb/ClerkSessionBean", beanInterface=ClerkSessionRemote.class, beanName="ClerkSessionBean")
public class Clerk extends javax.swing.JFrame
    @Resource
    javax.ejb.SessionContext sessionContext;
    ClerkSessionRemote clerkSessionBean = (ClerkSessionRemote) sessionContext.lookup("ejb/ClerkSessionBean");
}  The line:
ClerkSessionRemote clerkSessionBean = (ClerkSessionRemote) sessionContext.lookup("ejb/ClerkSessionBean");rises the exception
the output of the client:
init:
init:
deps-jar:
compile:
library-inclusion-in-archive:
Building jar: C:\Documents and Settings\IOANNIS_PAPAIOANNOU\My Documents\NetBeansProjects\VideoClub\VideoClub-ejb\dist\VideoClub-ejb.jar
dist:
deps-jar:
compile-single:
run-single:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at videoclub.Clerk.<init>(Clerk.java:33)
at videoclub.Clerk$2.run(Clerk.java:232)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
BUILD SUCCESSFUL (total time: 2 seconds)
Yiannis P.