j'ai cré un session bean qui s'appelle VolFacade voici son code:


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package ejb;
 
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Resource;
import javax.ejb.Stateless;
import javax.naming.InitialContext;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
import javax.persistence.PersistenceUnit;
import javax.transaction.TransactionManager;
import javax.transaction.UserTransaction;
 
/**
 *
 * @author Administrateur
 */
@Stateless
public class VolFacade implements VolFacadeLocal, VolFacadeRemote{
 
@PersistenceUnit(unitName = "OACA-ejbPU")
private EntityManagerFactory emf ;
@PersistenceContext(type=PersistenceContextType.EXTENDED)
 
private static final String JPA_UNIT_NAME = "OACA-ejbPU";
private EntityManager entityManager=null;
long n=0;
private Vol voll;
 
public EntityManager getEntityManager() {
if (entityManager == null) {
entityManager = Persistence.createEntityManagerFactory(JPA_UNIT_NAME).createEntityManager();
}
return entityManager;
}
 
 
 
 
public void create(long n) throws Exception {
 
try {
voll = new Vol(n);
voll.setDepart("dddddd");
voll.setDestination("fgfdd");
 
entityManager = getEntityManager();
entityManager.persist(voll);
} finally {
if (entityManager != null) {
entityManager.close();
}
}
}
 
 
}
ainsi que se 2 interface local et remote
pour le tester j'ai crée une classe client voici son code :

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package ejb;
 
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
 
 
public class client {
  public  client(){
}
 
 public static void main(final String[] args) throws Exception {
 
Context initialContext = new InitialContext();
        VolFacadeRemote vf = (VolFacadeRemote) initialContext.lookup("ejb.VolFacadeRemote");
        vf.create(5);
 
 
}
 
 
}
mais lors de son execution une erreur apparait ( l'EJB ne peut pas etre crée)
voici le code de l'erreur:

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Exception in thread "main" javax.ejb.EJBException: nested exception is: java.rmi.RemoteException: nested exception is: javax.ejb.EJBException: nested exception is: javax.ejb.CreateException: Could not create stateless EJB; nested exception is: 
        javax.ejb.EJBException: nested exception is: javax.ejb.CreateException: Could not create stateless EJB
java.rmi.RemoteException: nested exception is: javax.ejb.EJBException: nested exception is: javax.ejb.CreateException: Could not create stateless EJB; nested exception is: 
        javax.ejb.EJBException: nested exception is: javax.ejb.CreateException: Could not create stateless EJB
        at com.sun.enterprise.iiop.POAProtocolMgr.mapException(POAProtocolMgr.java:251)
        at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1411)
        at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1316)
        at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:210)
        at com.sun.ejb.containers.EJBObjectInvocationHandlerDelegate.invoke(EJBObjectInvocationHandlerDelegate.java:117)
        at $Proxy31.create(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie._invoke(ReflectiveTie.java:154)
        at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatchToServant(CorbaServerRequestDispatcherImpl.java:687)
        at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(CorbaServerRequestDispatcherImpl.java:227)
        at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequestRequest(CorbaMessageMediatorImpl.java:1846)
        at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:1706)
        at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleInput(CorbaMessageMediatorImpl.java:1088)
        at com.sun.corba.ee.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(RequestMessage_1_2.java:223)
        at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:806)
        at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.dispatch(CorbaMessageMediatorImpl.java:563)
        at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.doWork(CorbaMessageMediatorImpl.java:2567)
        at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:555)
Caused by: javax.ejb.EJBException: nested exception is: javax.ejb.CreateException: Could not create stateless EJB
        at com.sun.ejb.containers.StatelessSessionContainer$SessionContextFactory.create(StatelessSessionContainer.java:774)
        at com.sun.ejb.containers.util.pool.NonBlockingPool.getObject(NonBlockingPool.java:199)
        at com.sun.ejb.containers.StatelessSessionContainer._getContext(StatelessSessionContainer.java:486)
        at com.sun.ejb.containers.BaseContainer.getContext(BaseContainer.java:1700)
        at com.sun.ejb.containers.BaseContainer.preInvoke(BaseContainer.java:1229)
        at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:202)
        ... 17 more
javax.ejb.EJBException: nested exception is: java.rmi.RemoteException: nested exception is: javax.ejb.EJBException: nested exception is: javax.ejb.CreateException: Could not create stateless EJB; nested exception is: 
        javax.ejb.EJBException: nested exception is: javax.ejb.CreateException: Could not create stateless EJB
        at ejb._VolFacadeRemote_Wrapper.create(ejb/_VolFacadeRemote_Wrapper.java)
        at ejb.client.main(client.java:28)
Java Result: 1
quelqu'un peut m'aider c urgent
merci d'avance