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I need a specific feature of hibernate that is StatelessSession and for that I need Hibernate's SessionFactory. The problem is I only have the entityManagerFactory. How can I get a StatelessSession in this scenario?
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If a developer uses JPA, there's a neat little trick to get the Hibernate SessionFactory from JPA's EntityManager. First, perform a quick unwrap method call to get the Hibernate Session from the JPA EntityManager. Then call the Hibernate Session's getSessionFactory() method.
Using EntityManagerFactory approach allows us to use callback method annotations like @PrePersist, @PostPersist,@PreUpdate with no extra configuration. Using similar callbacks while using SessionFactory will require extra efforts. Related Hibernate docs can be found here and here.
Here's how I would do it (roughly): public class BaseDao{ private static final String PERSISTENCE_UNIT_NAME = "Employee"; private static EntityManagerFactory factory = Persistence. createEntityManagerFactory(PERSISTENCE_UNIT_NAME); public void create(MyEntiy person){ EntityManager em = factory.
Option 1 through EntityManagerFactory
If you use Hibernate >= 4.3 and JPA 2.1 you can accces the SessionFactory from a EntityManagerFactory through <T> T EntityManagarFactory#unwrap(Class<T> cls).
SessionFactory sessionFactory = entityManagerFactory.unwrap(SessionFactory.class);
Option 2 through EntityManager
If you use Hibernate >= 4.3 and JPA >= 2.0 then you can accces the Session from the EntityManager through <T> T EntityManagar#unwrap(Class<T> cls). From the Session you can obtain the SessionFactory.
Session session = entityManager.unwrap(Session.class);
SessionFactory sessionFactory = session.getSessionFactory();
Try to cast EntityManagerFactory to HibernateEntityManagerFactory.
Since EntityManagerFactory doesn't support unwrap() (unlike EntityManager), it seems to be the only way to achieve your goal.
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Hibernate >= 4.3 supports JPA 2.1. So you can use EntityManagerFactory.unwrap like emf.unwrap(SessionFactory.class) there.
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