I'm getting started with EJB3. I have a little demo that starts up fine when run as an Standalone J2SE App. When I try to start up the same when running as an eclipse plugin I get the Exception shown below. I assume that the META-INF/persistence.xml file isn't found at all. I tried jaring the META-INF and putting it an the classpath, I also tried to put the META.INF right alog with the plugin binaries. Any Ideas ? Where can I find the javax.persistence sources so I con inspect it better ? I guess its a eclipse classloader problem. Any help/hint would be very appreciated. Plain Hibernate works fine inside an eclipse plugin for me. I did that before.

Thomas
Hibernate version:
3.1beta3
Entity Manager beta 2

Mapping documents:
persistence xml
<?xml version="1.0" encoding="UTF-8"?>
<entity-manager>
<name>paris</name>
<class>eiswind.paris.domain.Category</class>
<properties>
<property name ="hibernate.connection.url" value="jdbc:postgresql:paris"/>
<property name ="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/>
<property name ="hibernate.connection.driver_class" value="org.postgresql.Driver"/>
<property name ="hibernate.connection.username" value="thomas"/>
<property name ="hibernate.connection.password" value=""/>
</properties>
</entity-manager>

Full stack trace of any exception that occurs:
javax.persistence.PersistenceException: No Persistence provider for EntityManager named paris
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:41)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:27)
at eiswind.paris.application.Application.run(Application.java:25)
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:334)
at org.eclipse.core.launcher.Main.basicRun(Main.java:278)
at org.eclipse.core.launcher.Main.run(Main.java:973)
at org.eclipse.core.launcher.Main.main(Main.java:948)
Name and version of the database you are using:
PostgreSQL 7.3

Persistence class is available in CVS HibernateExt/ejb-api