I have 2 tables and objects: Car and User

Car table:
car_id
update_user_id

User table:
user_id

So I have them mapped as follows:

<class name="Car" table="Car">
<id name="id" column="car_id">..</id>
<many-to-one name="updateUser" class="User" column="update_user_id"/>
</class>

<class name="User" table="User">
<id name="id" column="user_id">..</id>
</class>

I'm wondering how to construct a Criteria Query for getting all of the users that have been assigned as an updateUser for Car.
The SQL would be select user_id from User, Car where update_user_id = user_id. How do I construct the Criteria Query?

Thanks!

Hibernate version:2.1.6