criretia JPA

Criteria criteria = sessionFactory.getCurrentSession().createCriteria(TmUserAppGroup.class);
Criterion critUserId = Restrictions.eq("tmUserAppGroupPK.userId", userId);
Criterion critAppId = Restrictions.eq("tmUserAppGroupPK.appId", appId);
LogicalExpression expression = Restrictions.and(critUserId, critAppId);
criteria.add(expression);
List<tmuserappgroup> tmUserAppGroupList = criteria.list();