Another important piece of code is the following:
@Statefulpublic class UserBean { @PersistenceContext(unitName = "ch02-jta-pu", type = PersistenceContextType.EXTENDED) private EntityManager em; ...}
So, here we are defining our PersistenceContext as EXTENDED. It means that this persistence context is bound to the @Stateful bean until it is removed from the container.
The other option is TRANSACTION, which means the persistence context would live only by the time of transaction.
