spring data lazy loading

Question

I use spring data, jpa and hibernate

I have a Advertisement class

@Entity
public class Advertisement implements Serializable {

  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private Long id;

  @OneToMany(mappedBy="id", cascade={CascadeType.REMOVE}, fetch=FetchType.LAZY)
  private Set<Message> messages = new HashSet<Message>();
}

and a message class

@Entity
public class Message implements Serializable {
  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private Long id;
  @ManyToOne(fetch = FetchType.LAZY)
  private Advertisement advertisement;
}

when i search an Advertisement by id, i can see all their message... i don't understand why, i put lazy...

I search a way to load Advertisement without message.

What do you mean by I can see all their message? Do you mean you see the SQL being generated or do you mean you iterate through the set? — Kevin Bowersox, Aug 19 '13 at 21:24
Lazy loaded entities are often loaded into the list as a proxy. Just because the `Set` does not contain null values does not mean that Hibernate queried and loaded the objects. — Kevin Bowersox, Aug 19 '13 at 21:48
i put show sql (hibernate) to true, but i only see insert sql... not select sql — robert trudel, Aug 19 '13 at 21:59
ok i found strange i can't see any select... i want to be sure — robert trudel, Aug 20 '13 at 20:23
It might also be that when debugger hits the lazy list, it will cause hibernate to load the lazy collection if a session is still available. If session is not available at that point, you will get an exception. — vijay, Aug 21 '13 at 19:02

score 0 · Answer 1 · answered Jan 05 '15 at 01:37

0

You are not loading the messages until you call it.

answered Jan 05 '15 at 01:37

Shady Mohamed Sherif

15,003
4
45
54

spring data lazy loading

1 Answers1