Application Client Enity Manager cannot find Persistence Unit with JWS

I have an Enterprise Application Project in Netbeans 6.7.1.
The enterprise application client module has the business code and the
persistence unit (TopLink) defined in the app-client.jar. I can run this
application clinet from NB without a problem. I can also run it with JWS
if I remove the EnityManager.
I'm using JPA (EnityManager) in a Java SE environment.
When I try and run the app-client from Java Web Start I get an error
that the EnityManager cannot find the PU. The persistence unit is packaged in the app.ear->app-client.jar->META-INF->persistence.xml.
There's not a wealth of information, that I could find on the net, but this
seems to be correct.
The error I get is:
INFO: ACC009: Load Application Class: [jws.Main]
hello world! From JWS
Dec 3, 2009 11:44:21 AM com.sun.enterprise.appclient.MainWithModuleSupport <init>
WARNING: ACC003: Application threw an exception.
javax.persistence.PersistenceException: No Persistence provider for EntityManager named JWS-app-clientPU: The following providers:
oracle.toplink.essentials.PersistenceProvider
oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider
Returned null to createEntityManagerFactory.
Any ideas on what I need to do to properly package the PU for an Enterprise Application Client ??
Thanks,
David

I solved this problem.
When we call resources from EAR application, WebLogic adds "Cache-Control=private, no-cache, no-store, s-maxage=0, must-revalidate" to all responses header.
It was the reason of error occurence.
I used filter from http://flavio.tordini.org/http-headers-filter to remove Cache-Control from header when calling jar resources.
After that, applicatiom started to work again.

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