Hi,

I've two Entities, Item and Rack ... a Rack can have multiple Items, so I added a Collection to Rack:


However even that seems to generate constraints, and a simple insert into item isn't possible anymore:


Any idea whats the reason behind this?
(Note that I don't do manual SQL inserts, I've done it here, to get a cleaner error-msg)

Another problem I experience is that Item has an associated Placement entity:


However when placement=NULL because there has non been assigned so far, I also get an constraint voilation error.

Sorry for those noob-questions :/

Thanks, Clemens

Hibernate per default does define a foreign key constraint on each foreign key in your mapping.
This is to guarantee referential integrity, and good so far.

That's what is strange in your case, is that in some way you are able to make hibernate
insert the new item-record before the new rack-record.
Usually data gets flushed in the right sequence.
Can you please post a snippet of your sourcecode which creates and persists the new item and rack instance?

Sorry I completly messed the relation thing up. The way I tried to do this would have never worked.

Thanks for your patience and help!

- Clemens