How to get JPA configured with Spring 3?

Question

I have been reading spring\'s documentation, but I must say it is a bit confusing, giving several different option on how to configure JPA.

What is the best way, and

Answer 1

I use EclipseLink, but configuration must be very similar. Here you have most important parts.

pom.xml:

    
        org.springframework
        spring-orm
        ${org.springframework-version}
    
    
        org.eclipse.persistence
        eclipselink
        2.0.1 
    
     
        javax.persistence
        javax.persistence
        2.0.0
    

persistence.xml:

applicationContext-dao.xml:

    
     
    
    
        
            false
        
    



    

User.java:

@Entity
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE)
    private Integer id;

    private String name;

    // Getters and setters

}

UserDao.java:

@Repository
public class JpaUserDao implements UserDao {

    @PersistenceContext
    private EntityManager em;

    @Override
    public Item get(Integer id) {
        return em.find(User.class, id);
    }
}

UserService.java:

@Service 
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    @Transactional
    @Override
    public User getUser(Integer id) {
        return userDao.get(id);
    }

}

Hope it helps.