Question

I have a database (in postgres) and I’m working with spring 3 and hibernate 3, the problem is when try to delete or get a row from database, here is the class that I’m using, ohh another thing after the query, a don’t have any mistake, the only thing es that class User is null

@Repository("userDao")
public class UserDao implements IUserDao {

    @Autowired
    private SessionFactory sessionFactory;

    public void SaveUser(User user) {
    sessionFactory.getCurrentSession().save(user);
    }
    @SuppressWarnings("unchecked")
    public List<User> ListUsers() {
        List<User> users = (List<User>) sessionFactory.getCurrentSession().createCriteria(User.class).list();
        return users;
    }
    public User GetUserById(Integer id) {               
        User user = (User) sessionFactory.getCurrentSession().load(User.class, id);
        return user;
    }
}

by the way, methods, SaveUser and ListUser work really good.

this is the model class

@Entity
@Table(name = "mrbean")
public class User {

@Id
@GeneratedValue (strategy = GenerationType.AUTO)
@Column (name = "id")
private Integer id;

@NotNull (message = "not null")
@NotEmpty (message = "empty")
@Column (name = "user_name", length = 20, nullable = false, unique = true)
private String userName;

@NotNull 
@NotEmpty (message = "empty password")
@Size (min = 7, max = 20, message = "La contraseña debe tener entre 7 y 20 caracteres")
@Column (name = "password", length = 20, nullable = false)
private String password;

//with getters and setters

this is what hibernate show in console when
User user = (User)sessionFactory.getCurrentSession().load(User.class, id) is executed

Hibernate: select user0_.id as id0_0_, user0_.password as password0_0_, user0_.user_name as user3_0_0_ from mrbean user0_ where user0_.id=?

Answer 1

I would use “get” instead of “load” because load() creates a proxy of User (see Hibernate ref doc )
so i would try : User user = (User) sessionFactory.getCurrentSession().get(User.class, id);