Can this ever make sense?

Say I need to fetch an object from the DB which has a relation to another object (represented by a foreign key in the DB, and by a composition in my domain object). If in my first DAO I fetch the data for object 1, then call the dao for object 2, and finally (from within the first DAO, call the setter in object 1 and give it the previously fetched object 2).

I know I could do a join instead, but it just seems more logical to me to decouple the functionality (which is why I am skeptical about calling one dao from another). Or should I move some of the logic to the service layer?

Thanks

Update: I think I solved the problem with help from the answers: all I needed to do was add the following to my mapping of Object 1:

<one-to-one name="Object2" fetch="join"
        class="com...Object2"></one-to-one>

I didn't have to change anything else. Thanks for the help!