Imagine that A has a collection of Bs. Here is the technique. Join all the objects in the criteria  and then start adding the where clause but here is your query in its general form :



Query query=getSession().createQuery("from A a left outer join a.B b where b.x< :something").

setParameter("something", 10 /*for example*/);

return query.list();



Here is what I always do. I google "hibernate reference + hql". The first result will take you to a hibernate  Heaven. You can find  more complex examples out there....