I\'m using Eclipse Facets for JPA 2.0 and Hibernate 4.2 implementation. I think I recall that in previous project I would not have to register an Entity Bean in the persistence.
It's possible when you created the project, you picked "JPA project" instead of "java Project". In case you don't see "Java Project", follow the "other" and under the wizard type "java" to see the "Java Project".