Screencast da CAELUM - Hibernate + JPA - Dúvida

EntityManagerFactory emf = Persistence.createEntityManagerFactory("jpa-hibernate");
        EntityManager em = emf.createEntityManager();
        
        //Salvar
        
        em.getTransaction().begin();
        User user = new User();
        user.setName("name");
        user.setLogin("usr");
        user.setPassword("123");
        em.persist(user);
        em.getTransaction().commit();
        
        em.close();
        emf.close();
    }