How do I use the same JPA entities in multiple applications?

[krenfro]

JBoss 4.2.2

I have some JPA entities packaged in User-entity.jar with a persistence context named 'UserPU'. I include this User-entity.jar in an ejb.jar and deploy it. This works great and I can CRUD entities. Now I want to include the User-entity.jar in a separate application (ear or ejb-jar) and when deployed I get the following WARNING:

13:29:37,778 WARN [ServiceController] Problem starting service jboss.j2ee:module=User-entity-0.1-test.jar,uid=1243449447,service=EJB3
java.lang.RuntimeException: javax.management.InstanceAlreadyExistsException: persistence.units:unitName=UserPU already registered.

Is it possible to reuse JPA entities in this way? Is it recommended?

thanks!

[krenfro]

So this documentation seems to indicate that I can reference the entity manager from separate applications if it is configured in the global jndi namespace.

http://docs.jboss.org/ejb3/app-server/reference/build/reference/en/html/entityconfig.html

This is done by adding these properties to persistence.xml

<property name="jboss.entity.manager.jndi.name" value="java:/Manager1"/>
<property name="jboss.entity.manager.factory.jndi.name" value="java:/Manager1Factory"/>

Am I on the right track here?