EJB 3.0 entity found within JDeveloper but not on OAS 10.1.3

I'm tearing my hair out with this!
Basically I have an entity bean with a primary key annotated with @Id, a stateful session bean facade which has an EntityManager injected through @Resource, and a java client in JDeveloper which calls this bean through a lookup.
In JDeveloper 10.1.3 it works fine, no problems. I deploy the app, along with a JSP version of this client, to Oracle AS 10.1.3.0 - the deploy goes through without a problem. Whenever I try to use the JSP to test that it's working, I get a NPE in the server logs - but it only points to the compiled JSP class, and therefore not corresponding to a line in the actual JSP!
Here is the error stack trace:
06/10/12 12:01:51 java.lang.NullPointerException
06/10/12 12:01:51 at usernametest.jspService(_usernametest.java:121)
06/10/12 12:01:51 at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java:59)
06/10/12 12:01:51 at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:416)
06/10/12 12:01:51 at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:478)
06/10/12 12:01:51 at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:401)
06/10/12 12:01:51 at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
06/10/12 12:01:51 at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:719)
06/10/12 12:01:51 at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:376)
06/10/12 12:01:51 at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:870)
06/10/12 12:01:51 at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:451)
06/10/12 12:01:51 at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:299)
06/10/12 12:01:51 at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:187)
06/10/12 12:01:51 at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
06/10/12 12:01:51 at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303
06/10/12 12:01:51 at java.lang.Thread.run(Thread.java:595)
Does this look obvious to anyone? All I am asking is a general idea to what the problem might be. I have been looking at this for 2 weeks and keep going round in circles. If anyone here has any idea that would be much appreciated.
I will supply other code (JSP, bean) if necessary, as this isn't a Java forum ;)
Thanks in advance
Paul

Hi Lonneke,
Here is the bean class:
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;
public List<Ereq> getEreqs(String username) {
Query query = manager.createNativeQuery("SELECT p.BAAN_ACTIVITY_CODE, p.CLIENT_REF_NO, p.DELIVERY_SITE, p.EREQ_MESSAGE, p.EREQ_REF_NO, p.EREQ_STATUS, " +
"p.LAB_REF_NO, p.ORDER_DATE, p.PROJECT_CODE, p.PURCHASED_ORDER_NUMBER, p.REQUIRED_DATE, p.USER_FULLNAME " +
"FROM Processed_Ereq p, Ereq_User_Link e, Users u " +
"WHERE p.ereq_ref_no = e.ereq_ref_no " +
"AND e.user_id = u.user_id " +
"AND u.username= '" + username + "'", Ereq.class);
return query.getResultList();
Here is 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="sun.misc.BASE64Encoder,java.util.regex.*" %>
<%@ 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) session.getAttribute("Cart");
//if (cart==null) {
CartLocal cart = (CartLocal) ctx.lookup("java:comp/env/cart");
//session.setAttribute("Cart", cart);
//ereqs = cart.getEreqs(m_username);
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 (NullPointerException e){
e.printStackTrace();
%>
Any help is welcome
Thanks
Paul

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EJB/JPA Session/Entity Bean: Back Reference Id not set

Hello All,
I m using JPA as a persist tool. I have an entity Account and in Account there is a collection of entity AccountDetail. In Account entity relation for AccountDetail is One-To-Many and in AccountDetail the relation for Account is Many-To-One. When i save the Account, object of Account and AccountDetail are saved correctly. But the problem is that in AccountDetail the Id of Account is not saved in Database table. I have AccountId in AccountDetail table. plz help me??
Second thing is that how to generate automatically primary keys when entity saved in database ???

define the column you want to auto increment as an Integer with Identity attribute set to True (using the sql server management tool for example) and then put
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
in front of the ID declaration in the mapping file, it should generate the IDs automatically.

I need a script that can delete duplicate songs within iTunesMedia but not shown on iTunes GUI

I copied entire music in itunes library A and paste it in itunes library B. I subsequently experimented with import playlist and import .XML files of itunes library A to itunes library B. I notice songs in music folder have been duplicated i.e. the gigabyte of music folder greated than gigabyte shown on itunes GUI.
Wow, I never knew importing .XML file (through import playlist) will import the songs, the metadata, the artwork and the entire playlist which i never created in the first place (I dont know what else had been imported).
Anyway, the songs are not duplicated on the iTunes GUI. They are duplicated within iTunesMedia\Music... folders. Can someone provide me a Script to delete these approx. 100GB duplicates. The DeDuper Script I have can only delete duplicate songs displayed on iTunes GUI.
Thanks for your help as usual.

The script is only intended to work on things that iTunes would treat as "Exact Duplicates" and it only works on files that are connected to the iTunes library. Before starting all files in your media folders should be added to the iTunes library.
In the context of the earlier thread, type 1 or logical duplicates are multiple entries to the same file and type 2 or physical duplicates are multiple copies of the same file. Type 2 dupes will have identical tag information (at least they will unless you edit one of them) and the same file size so will thus display as "Exact Duplicates" if present.
The script avoids the more complex problem of trying to detect and selectively remove what I called type 3 duplicates, that is alternate recordings or rips of the same tune, principally because that is a much harder problem to automate, but also because "best track to keep" from a set of potential candiates will be a subjective matter.
The current version of the DeDuper script is 1.0.1.2 dated 2nd December 2011. I've just downloaded and run it on a test library. I had 35 tracks that I first duplicated by copying the Music folder into Automatically Add to iTunes. I then renamed Music as Music1, selected each file in turn so that iTunes would "know" the files were missing, renamed the folder back to Music and then dragged & dropped the folder into the library. This created a library of 140 tracks, 35 originals, 35 physical dupes and 70 logical dupes . The script ran as designed and reduced the library back down to 35 tracks with the 35 physical dupes being sent to the recycle bin.
tt2

EJB 3.0 entity found within JDeveloper but not on OAS 10.1.3

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