请教：：关于Hibernate时间问题

想将过期的数据资料取出来，用HIBERNATE数据库是ORACLE始终取不出
代码：
Transaction tran = getSession().beginTransaction();
        List l = null ;
        Date da2 = new Date(System.currentTimeMillis());
        String hql = "from InventoryN in where in.ended <?";
        Query q = getSession().createQuery(hql);
        q.setTimestamp(0, da2 );
        l = q.list() ;
        ();
        return l ;