Good afternoon!

Maple Hiberneyt class that contains a collection of objects of another class. It looks like this

@OneToMany(cascade = CascadeType.ALL, mappedBy = "owner") @Fetch(FetchMode.JOIN) private List<Action> actions;

on the other side

 @ManyToOne() private Manager owner;

Next, I do a Criterion request to get all the container objects (that is, class = Manager). And I see in the logs: Hibernette first receives container objects, and then makes special-selects for each of them to get nested collections, that is, it outputs to the select database ... where id = container_id for each container found earlier. It seems to me not very optimal. Isn't it better to take everything together by one join? This raises the question: is it possible to force Hibernate to take all nested collections with one join?

In order not to get up twice, ask another question: in my example, as you can see, I use Eager Fetch to show these my nested collections in jsp. But I also tried to do Hibernate.initialize (containerObject OR List <containerobject>), but it does not work: LazyInitialization remains.

Why does not Hibernate.initialize work? I thought he was just for such cases. I also tried to use my hibernateTemplate.initialize () (through which, by the way, I run the Criteria), the result is the same.

    2 answers 2

    Try adding to your field:

     @LazyCollection(LazyCollectionOption.FALSE)

      On the second question:

      he says: No session or session was closed

      Apparently, you are trying to perform a forced initialization after you close the session.

      • I do not see the session at all. I do everything through Spring's hibernateTemplate. But you are probably right, the session is closed. It turns out after this proxy is not already filled in by any means? - KutaBeach