detachedCriteria.getExecutableCriteria 偶尔出错

    public long  countByCriteria() {
        Long count = (Long) getHibernateTemplate().execute(new HibernateCallback() {
                    public Object doInHibernate(Session session)throws HibernateException, SQLException {
                        Criteria criteria = session.createCriteria(getPersistentClass());
                        return criteria.setProjection(Projections.rowCount()).uniqueResult();
                    }
                });

        if (null == count) {
            return 0;
        } else {
            return count.longValue();
        }
    }

    public long countByDetachedCriteria(final DetachedCriteria detachedCriteria) {
        Long count = (Long) getHibernateTemplate().execute(new HibernateCallback() {
                    public Object doInHibernate(Session session)
                            throws HibernateException, SQLException {
                        Criteria criteria = detachedCriteria.getExecutableCriteria(session);
                        return criteria.setProjection(Projections.rowCount()).uniqueResult();
                    }
                });

        if (null == count) {
            return 0;
        } else {
            return count.longValue();
        }
    }