Different between @LazyCollection to fetch=FetchType.EAGER

avimar · **Joined:** Mon Apr 07, 2008 12:49 pm **Posts:** 33

Hey,
I am working with JPA in JBoss 4.2 and I wonder what is the difference between adding to @OneToMany annotation - fetch=FetchType.EAGER to add hibernate annotation - @LazyCollection(value=LazyCollectionOption.FALSE)?

As I understand they need to have the same behavior , but with the first option (fetch=FetchType.EAGER) I got the

Quote:

simultantantly fetching multiple bags exception

when hibernate try to build the session factory.

Thank you

emmanuel · **Posted:** Mon Apr 07, 2008 6:51 pm

http://www.hibernate.org/hib_docs/annotations/reference/en/html/entity.html#entity-hibspec-singleassoc-fetching

avimar · **Joined:** Mon Apr 07, 2008 12:49 pm **Posts:** 33

I read this and as i undersatnd they are the same - so i still have my question - why with fetch = eager i got the :
simultantantly fetching multiple bags exception

and with - @LazyCollection(value=LazyCollectionOption.FALSE) i dont get this exception.

Thank you

emmanuel · **Posted:** Wed Apr 09, 2008 11:42 am

They are not the same

@ManyTo[One|Many](fetch=FetchType.EAGER) = @LazyCollection(FALSE) + @Fetch(JOIN)

I imagine in your case, you have

@ManyTo[One|Many](fetch=FetchType.LAZY) + @LazyCollection(FALSE)
Which means @LazyCollection(FALSE) + @Fetch(SELECT)