hibernate中使用max返回值问题

public int getMaxShowIndex(Region region) {  
   List list = null;
   int maxShowIndex = 1;   
   HibernateCallback callback = new HibernateCallback() {
    public Object doInHibernate(Session session)
      throws HibernateException {
     Query q = session
       .createQuery("select max(showIndex) from Region");

     return q.list();
    }
   };
   list = (List) getHibernateTemplate().execute(callback);
   if (list != null)
    if (list.size() == 1) {
     if (list.get(0)!=null) ///如果没有数据,这里会返回一个null
      maxShowIndex = ((Integer) list.get(0)).intValue();
    }
   return maxShowIndex;
}