Persistence Problem with Jboss 4.0.3, Hibernate

[darretta]

I'm a persistence/EJB 3 newbie having difficulties initializing my EntityManagerFactory. The error I'm getting is the infamous "No Persistence provider for Entity Manager "....

Here is my setup:

* JBoss 4.0.3SP1

* PostgreSQL 8.2.4

* Hibernate persistence

* Deployed EAR:

vram.ear
 |
 -- vram-ejbs.jar
 |
 -- hibernate.properties
 -- META-INF/persistence.xml

* persistence.xml

<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0">
 <persistence-unit name="vramPu">
 <provider>org.hibernate.ejb.HibernatePersistence</provider>
 <jta-data-source>java:/nicweb/DataSource</jta-data-source>
 </persistence-unit>
 <properties>
 <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/>
 <property name="hibernate.show_sql" value="true"/>
 </properties>
</persistence>

* hibernate.properties
hibernate.dialect org.hibernate.dialect.PostgreSQLDialect
hibernate.connection.driver_class org.postgresql.Driver
hibernate.connection.url jdbc:postgresql://localhost/nicweb
hibernate.connection.username nicweb-admin
hibernate.connection.password nicweb-admin

* EJB Stateless Session Bean

@Stateless
public class MyClass implements MyClassRemote {

 @PersistenceContext
 private EntityManager em;

 @PersistenceUnit
 private EntityManagerFactor emf;

 ...

 /* Error thrown at this call... */
 emf = Persistence.createEntityManagerFactory("vramPu");
 em = emf.createEntityManager();

I think the Persistence API is able to locate the persistence.xml file, and the hibernate.properties is loaded (but not sure if needed).

Any help is greatly appreciated.

Regards,
Mike

[darretta]

I have since removed hibernate.properties...still no joy.

[jaikiran]

Please post the appropriate part of the logs along with the exception stacktrace.

[darretta]

In gathering the requested logs, I noticed for the first time this message:

Persistence unit name: vram-dos-server-ejbs-CURRENT

This is the actual name of my EJB jar file, not my persistence unit name configured in persistence.xml. I changed my code to reference this name, and everything works! I do have a new persistence.xml file as well (though I don't think this changed anything). Below is the file. I you have any thoughts as to why the persistence unit name is my jar file name and not the name given in the XML file, that would be helpful. Thanks!

<?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="vramPu">
 <provider>org.hibernate.ejb.HibernatePersistence</provider>
 <jta-data-source>java:/nicweb/DataSource</jta-data-source>
 <jar-file>vram-dos-server-ejbs-CURRENT.jar</jar-file>
 <properties>
 <property name="hibernate.cache.provider_class" value="org.hibernate.cache.NoCacheProvider"/>
 </properties>
 </persistence-unit>
</persistence>

[darretta]

Upgraded to RC5 and problem resolved.