From: <glassfish_at_javadesktop.org>
Date: Sat, 17 Jan 2009 05:48:55 PST

Guys,

Environment Details

Netbeans 6.5
Glassfish V2 ur2
Toplink
Oracle thin JDBC driver
JAVA EE application

I am getting the following error:

root cause

javax.persistence.PersistenceException: No Persistence provider for EntityManager named myapp-ejbPU: The following providers:
oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider
oracle.toplink.essentials.PersistenceProvider
Returned null to createEntityManagerFactory.


persistence.xml file...


<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
  <persistence-unit name="myapp-ejbPU" transaction-type="JTA">
    <jta-data-source>mydatasource</jta-data-source>
    <properties/>
  </persistence-unit>
</persistence>


also mydatasource pings fine...and I also executed some queries just fine...

this is how I am creating the entity manager...

  public EntityManager getEntityManager() {
    if (emf == null) {
    emf = Persistence.createEntityManagerFactory("myapp-ejbPU");
    }
    return emf.createEntityManager();
    }

What am I missing...please suggest...

-Amor
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