Please Help With toplink deployment

Question

Hello
I have a simple j2ee application that runs great in jdeveloper but bombs when I deploy it to my OAS server.
JDev Version 10.1.2
OAS 10.1.2
Technologies used
Struts, toplink
I have 1 table I mapped with toplink, I have a toplink-deployment-descriptor.xml, sessions.xml and a TopLink Mappings.
I have a struts action called kicker.
In kicker I do the following:
<code>
oracle.toplink.tools.sessionconfiguration.XMLLoader xmlLoader = new oracle.toplink.tools.sessionconfiguration.XMLLoader("META-INF/sessions.xml");
oracle.toplink.tools.sessionmanagement.SessionManager sessionManager = oracle.toplink.tools.sessionmanagement.SessionManager.getManager();
DatabaseSession session = (DatabaseSession)sessionManager.getSession(xmlLoader, "default", Thread.currentThread().getContextClassLoader());
Vector objects = session.readAllObjects(t3.model.NibuSalaryWorksheets.class);
System.out.println(objects.size());
request.getSession().setAttribute("results",objects);
return mapping.findForward("success");
</code>
Then in a jsp page I iterate over the results collection and print it out.
When I try to deploy this it blows up on the server with the following error :
Local Exception Stack:
Exception [TOPLINK-6007] (Oracle TopLink - 10g Release 3 (10.1.3.0.0) (Build 060118)): oracle.toplink.exceptions.QueryException
Exception Description: Missing descriptor for [class t3.model.NibuSalaryWorksheets].
Query: ReadAllQuery(t3.model.NibuSalaryWorksheets)
Can someone please help me, I am desparate to use toplink over ejb's but I can't get it to run on the server.
thanks
troy

Answer 1

Seems to be some kind of classloader issue.
You can check if the session has a descriptor for the class by calling,
session.getDescriptor(Class.forName("t3.model.NibuSalaryWorksheets"));
It is most likely that the class is on the classpath twice.
Instead of loading the sessions.xml with the thread class loader you could try using the classes class loader.
i.e.
DatabaseSession session = (DatabaseSession)sessionManager.getSession(xmlLoader, "default", t3.model.NibuSalaryWorksheets.class.getClassLoader());