Hi! I have 2 classes A, B with a one-to-one mapping. In the xml of class A, I put:
....
<one-to-one name="b" class="B"/>
....

then, in the xml of B, I put:
...
<one-to-one name="a" class="A" constrained="true"/>
...

when I excute this query:
...
List list = session.createQuery("from A a where a.b is null").list();
...

it returns all Objects 'a' where a.b isn't null and a.b is null when I just expected all Objects 'a' where a.b isn't null.
Any help?

[b]Hibernate version:[/b]
2.1.6
[b]Mapping documents:[/b]

[b]Code between sessionFactory.openSession() and session.close():[/b]

[b]Full stack trace of any exception that occurs:[/b]

[b]Name and version of the database you are using:[/b]
MS SQL Server 2000
[b]The generated SQL (show_sql=true):[/b]

[b]Debug level Hibernate log excerpt:[/b]

Did you properly set up your id generator? If not read all of the reference manual, section 5.1.11 to learn how to do this.

HTH
Ernst

Read the FAQ please.