EJB 3.0 Session bean transfers null Entity

Hello all
I am having trouble trying to transfer an Entity from a stateful session bean to a JSP. When I try an identical method with a java client within the OC4J container of JDeveloper, it works fine. However when I deploy the application to OracleAS 10.1.3, I get a null pointer on the entity.
Please help. I have been stuck on this for about 3 weeks, and I've followed documentation to the letter as far as I can see.
Here is the code for the JSP, the (simplified) bean and the Entity in question.
Bean:
import java.util.List;
import javax.annotation.Resource;
import javax.ejb.Stateful;
import javax.persistence.EntityManager;
import javax.persistence.Query;
@Stateful(name="cart")
public class CartBean implements CartRemote, CartLocal {
    @Resource
    protected EntityManager manager;
    public CartBean() {
         public User getUser(String username){
                User user = manager.find(User.class, username);
         return user;
    }The JSP:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ page contentType="text/html;charset=windows-1252"%>
<%@ page import="com.evotec.ereq.CartLocal" %>
<%@ page import="com.evotec.ereq.User" %>
<%@ page import="javax.naming.InitialContext" %>
<%@ page import="java.util.List" %>
<%@ page import="java.util.ArrayList" %>
<%!String m_username = "pbarrett";%>
<%!String emailAddress = "";%>
<%
try {
    InitialContext ctx = new InitialContext();
    CartLocal cart = (CartLocal) ctx.lookup("java:comp/env/cart");
        User user = cart.getUser(m_username);
        emailAddress = user.getEmailAddress();
%>
<html>
<body>
you are: <%= m_username %><BR>
your email address is: <%= emailAddress %><BR>
</body>
</html>
<%
catch (Exception e){
    e.printStackTrace();
%>and the User entity:
import java.io.Serializable;
import java.sql.Timestamp;
import static javax.persistence.AccessType.FIELD;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Table;
import javax.persistence.Id;
@Entity(access=FIELD)
@Table(name="USERS")
public class User implements Serializable {
    @Column(name="CREATION_DATE")
    protected Timestamp creationDate;
    @Column(name="DISPLAY_NAME")
    protected String displayName;
    @Column(name="EMAIL_ADDRESS")
    protected String emailAddress;
    @Id
    @Column(name="USERNAME")
    protected String username;
    @Column(name="USER_ID")
    protected Long userId;
    @Column(name="USER_STATUS")
    protected Long userStatus;
    public User() {
          //JDeveloper-generated getters and setters
}I should point out that I have established that the null pointer is not coming from the CartLocal lookup.
Any help welcome, thanks in advance.
Paul

Hi,
Thanks for the quick response.
I have tried this approach before but when I try and deploy to the server, I get this message:
@PersistenceContext annotation can only be used when a javax.spi.PersistenceProvider is installed.
Is this a missing jar file? If so, which one?
Thanks
Paul

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App Server Connection.
first combo is ok there is EJB applicaiton
Secound is empty .. but i Have App Server.
Another think is that when i create EJB 3.0 its BAD to see J2EE app it must be J EE 5 app or just Java EE app

Looking up a EJB 3.0 Session Bean in JSP Scriptlet

Hello There,
Somebody please enlighten me. I have a bean named
a.b.MyBeanextending local interface
a.b.MyLocalNow I want to use this bean in a JSP (Maybe just for fun, but the point is I am not using resource injection).
So the question is, What is the default JNDI name of the session bean with only a local interface, which I can use to look-it-up in jsp scriptlet code.
Cheers. Am trying for last hour, nothings turned up
Bye

It's the classname under the initial context or a.b.MyLocal in your case.
     <% MyLocal intf = null;
          try {
               InitialContext context = new InitialContext();
               intf = (MyLocal) context.lookup(MyLocal.class.getName());
          } catch (Exception ex) {
               System.err.println("Error looking up MyLocal: " + ex.getMessage());
          } %>

EJB 3.0 Session Bean Inheritence

Hi all,
Can one stateless session bean extend another? I get "no" for an answer during deployment of my EJB module. I'm using NetBeans 5.5 with Sun App Server 9.0.
For example:
@Stateless
MySessionBean1 implements ...some remote interface {
@Stateless
MySubBean extends MySessionBean1 implements some more interfaces {
}

There is no support for "component" inheritance in EJB. You are free to use implementation
inheritance to implement your bean class, but the fact that a super-class happens to be the
bean class of a different EJB has no bearing on the processing of the sub-class. So, for example,
the fact that MySessionBean1 has "some remote interface" will not automatically make
"some remote interface" one of MySubBean's remote interfaces.
--ken

EJB 3.0 Session bean transfers null Entity

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