Hi Dornus, There are two solutions I can think of. The first side-steps an EJB query. One of class A's attributes will be a collections of some sort of class B. Simply get an instance of class A by primary key, get an instance of the collection of Bs and do a bees.size(). The second is to do a join. Something like select ab from A as a join a.b as ab where a.PrimaryKey=PK and then again a size() on ab. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4022152#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...