Hibernate: best practice to pull all lazy collections

Question

What I have:

@Entity public class MyEntity {   @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true)   @JoinColumn(name = "myentiy_id")   private List<Address> addreses;    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true)   @JoinColumn(name = "myentiy_id")   private List<Person> persons;    //.... }  public void handle() {     Session session = createNewSession();    MyEntity entity = (MyEntity) session.get(MyEntity.class, entityId);    proceed(session); // FLUSH, COMMIT, CLOSE session!     Utils.objectToJson(entity); //TROUBLES, because it can't convert to json lazy collections } 

What a problem:

The problem is that I can't pull lazy collection after session has been closed. But I also can't not close a session in proceed method.

What a solution (coarse solution):

a) Before session is closed, force hibernate to pull lazy collections

entity.getAddresses().size(); entity.getPersons().size(); 

....

b) Maybe more ellegant way is to use @Fetch(FetchMode.SUBSELECT) annotation

Question:

What is a best practice/common way/more ellegant way to do it? Means convert my object to JSON.

Answer 1

Use Hibernate.initialize() within @Transactional to initialize lazy objects.

 start Transaction        Hibernate.initialize(entity.getAddresses());       Hibernate.initialize(entity.getPersons());  end Transaction  

Now out side of the Transaction you are able to get lazy objects.

entity.getAddresses().size(); entity.getPersons().size();