Creating EJB 3.0 Entity Relationships - EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g - page 227

The Summary page lists the session bean and the remote interface that will be
created. Click on Finish . A session bean and a remote business interface get created.
The Session Bean class
The session bean is a Stateless session bean. The global JNDI name is specified
with the mappedName element:
@Stateless(name = "CatalogSessionEJB", mappedName = "EJB3-SessionEJB")
public class CatalogSessionEJBBean implements CatalogSessionEJBRemote
{
}
Inject an EntityManager into the session bean using the dependency injection.
@PersistenceContext(unitName = "em")
EntityManager em;