The only portable way I know is by queries which return both, the actual entity and the computed value as two different result elements, e.g. EntityManager em; Query q = em.createQuery("SELECT o, COUNT(o.positions) FROM OrderEntity o ..."); List<Object[]> results = q.getResultList(); for (Object[] result: results) { OrderEntity order = (OrderEntity)result[0]; order.setPositionCount((Integer)result[1]); //... do something with your order } This is of course somehow selfmade but maybe it helps :-) Regards, Jan View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4024180#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...