I'm using seam 3 persistence, hibernate 4xx, JTA, JBOSS as 7, weld, richfaces 4.0.Final

My problem is: detached entity passed to persist;
It happens because each method executes in transaction, so, causes persistence context has been detached.
I wanna call "public void setCurrentId(String id){", set instance by entitymanager find, edit on my jsf2.0 form, and then, persit to the database.

My relevant code:

@Named("myHome")
@ViewScoped
public class MyHome extends AbstractHome<fooEntity>{
..

@Inject
private DAO<fooEntity> dao;

public void setCurrentId(String id){
  getDao().newInstance();
  getDao().setCurrentId(id);
  getDao().setInstance((fooEntity) getEntityManager().find(fooEntity.class, getDao().getId()));
}
..
}//end myHome

public abstract class AbstractHome<T> implements Serializable {
private static final long serialVersionUID = 1L;

  @PersistenceContext(type=PersistenceContextType.EXTENDED)
  private EntityManager entityManager;
...
  public EntityManager getEntityManager() {
    return this.entityManager;
  }
...
}//end AbstractHome

public class DAOFactory<T> implements Serializable {
private static final long serialVersionUID = 1L;

  @ExtensionManaged
  @PersistenceContext(type=PersistenceContextType.TRANSACTION)
  private EntityManager em;

  @Produces
  public DAO<T> create(InjectionPoint injectionPoint) {
    ParameterizedType type = (ParameterizedType) injectionPoint.getType();
    Class classe = (Class) type.getActualTypeArguments()[0];
    DAO<T> dao = new DAO<T>(classe, this.em);
    return dao;
  }

}//end DAOFactory

public class DAO<T>
...
public void save() {
  getEntityManager().joinTransaction();
  getEntityManager().persist(getInstance());
}
..
}//end DAO<T>