I try to use Spring+JPA+Hibernate and try to inject EntityManagerFactory,and later create EntityManger in my code.But when I use entityManager.persist(user),the user not saving to the database.But when I try to inject the EntityManager instead of EntityManagerFactory,it worked !,I do not know where is the problem.
you can also see this question for more code.
When using a plain EntityManagerFactory instead of an EntityManager you need to call createEntityManager. This will always create a new EntityManager, this is basically a plain EntityManager not managed nor detected by Spring. So you will also have to start/commit transactions yourself.
When using the EntityManager you will obtain a transactional synchronized instance, which is managed by Spring and bound to the current transaction. So no need to start / commit a transaction yourself.
See also the JPA section of the reference guide.
