Ok the problem is that for executeFind() the return type is List....so there is no way to use uniqueResult() within the callback from executeFind()...may be we should use execute()

上面这段话来自http://forum.springframework.org/showthread.php?t=58370

在使用executeFind方法时，如果返回的不是List类型的数据则会出现引异常

例:
 public Integer findCount(final Class clazz,final String str) {
  return Integer.parseInt(getHibernateTemplate().executeFind(new HibernateCallback()
  {

@Override
   public Object doInHibernate(Session session)
     throws HibernateException, SQLException {
    StringBuilder sb=new StringBuilder();
    sb.append("select count(*) from ");
    sb.append(clazz.getName());
    sb.append(" ");
    sb.append(str);
    log.info(sb.toString());
    return session.createQuery(sb.toString()).uniqueResult();
   }
   
  }).toString());
 }

解决方法是把executeFind方法改为execute方法

public Integer findCount(final Class clazz,final String str) {
  return Integer.parseInt(getHibernateTemplate().execute(new HibernateCallback()
  {

@Override
   public Object doInHibernate(Session session)
     throws HibernateException, SQLException {
    StringBuilder sb=new StringBuilder();
    sb.append("select count(*) from ");
    sb.append(clazz.getName());
    sb.append(" ");
    sb.append(str);
    log.info(sb.toString());
    return session.createQuery(sb.toString()).uniqueResult();
   }
   
  }).toString());
 }