Using collections of detached entities

[straiver]

I'm using collections of entities with multiple agregations: class Test agregates the collection of Question objects with @OneToMany annotation and each Question object agregates the collection of Answer objects. I need to send the whole test with questions and answers to the remote client, but when it recives the test I can't get access to the colections of agregated entities 'cause LazyInitializationException . I set fetch=FetchType.EAGER for collection of questions in class Test and it works, but when I've tried to do the same thing for answers I got

org.hibernate.HibernateException: cannot simultaneously fetch multiple bags

I'd be very glad if somebody could help me to solve this trouble

[cuoz]

IIRC, I think I solved this by using List instead of Collection.

HTH,
gary

[straiver]

AFAIK List extends Collection, so it doesn't matter what interface to use, and actualy I used List and Set, thought named them as Collection.

[cuoz]

Maybe this link will help:
http://jroller.com/page/eyallupu?entry=hibernate_exception_simultaneously_fetch_multiple

I don't have my code handy where I'm at, but I know I changed many of my collections to another type to work around this.

gary.

[straiver]

Thanks a lot, I've replaced List with Set and now it works!