use javax.persistence.Query in hibernate 4.2.3

Question

I use hibernate-4.2.3 and i will run my first NamedQuery. i create it as below:
@NamedQuery(name="LoadUserWithEmail",query="select u from User u where email=:email")
after that i get it with session.createNamedQuery:

        SessionFactory sessionFactory=SessionFactoryBuilder.build();
        Session session=sessionFactory.openSession();
        javax.persistence.Query query=  (javax.persistence.Query) session.getNamedQuery("LoadUserWithEmail");
        query.setParameter("email", email);
        User user=  (User) query.getSingleResult();  

but when i run this code i get following error:

Exception in thread "main" java.lang.ClassCastException: org.hibernate.internal.QueryImpl cannot be cast to javax.persistence.Query
at ir.sarresid.persistence.dao.UserDaoImpl.getWithEmail(UserDaoImpl.java:15)
at ir.sarresid.persistence.test.PersonTest.getUser(PersonTest.java:51)
at ir.sarresid.persistence.test.PersonTest.main(PersonTest.java:17) 

how i can solve it. i will not use org.hibernate.Query.
Do you have any solution. thanks.

Answer 1

It looks like you are mixing Hibernate-specific types and annotations with JPA types and annotations. SessionFactory and Session are Hibernate-specific classes, and session.getNamedQuery() returns an object that implements org.hibernate.Query, not javax.persistence.Query.

On the other hand, javax.persistence.Query is a JPA class and will be returned if you create the named query using JPA's EntityManager, e.g.:

javax.persistence.Query query = entityManager.createNamedQuery("LoadUserWithEmail");

Note also that there is a org.hibernate.annotations.NamedQuery and a javax.persistence.NamedQuery.

It is usually simpler to not mix the types and annotations of the two interfaces (SessionFactory vs JPA). If you use SessionFactory, you should stick with the Hibernate-specific types.