setPropertyCriteria("collection:users,object:u,u.id:eq:" + user.getId());

相当于执行：jpql:select o from Task o  join o.users u where  u.id = :u_id_64 order by o.id desc

另外一个属性设置方式

PropertyCriteria p = new PropertyCriteria(Criteria.and);		p.setCollection("positions");		p.setObject("p");		p.addPropertyEditor(new PropertyEditor("p.positionName", Operator.eq,				"学生"));