Hi there - I am using NH 2.0.

I am used to using the Criteria API for retrieving objects, but
yesterday I ran into problems. I want to find a sub-set of objects of
class A whoose one-to-one relation to another class B is null.

If I use the Restrictions.IsNull of the Criteria API it does not work.
I will ask for entities of type B where B.Id IS NULL, which will never
happen.

My setup:

Class A
 ID : int
 Name : string
 B : B

Class B
 ID : int
 Name: string

The classes A and B share the same primary key hence I thought it best
to use a one-to-one relation for the A.B property.

I have solved this using HQL using a sub-query but I would still like
to know if its possible to do this using the Criteria API.

Cheers,
Thomas
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