SQL执行提示 unexpected token: as [Select.....] nest exception is org.hibernate.Query

代码:   
    
      public List findAllowance(final String deptname,final String qclx,final String qs) {
  return getHibernateTemplate().executeFind(new HibernateCallback() {
  public Object doInHibernate(Session session) throws HibernateException,
  SQLException {
 
  String sql ="Select a from A as a,B as b where a.grxxZb.grxxid = b.grxxZb.grxxid and b.qcxxZb.qcid in (select qcxx.qcid from C as c where c.dwmc=:dwmc and c.qclx=:qclx and c.qs=:qs and c.sbhdbz='审核')";
 
  //转换查询语句
  Query query = session.createQuery(sql);
  //设置变量值
  query.setString("dwmc", deptname);
  query.setString("qclx", qclx);
  query.setString("qs", qs);
 
  List list = query.list();
 
  return list;   
    
  当执行到 List list = query.list();时抛出上面那个异常.
  unexpected token: as [Select.....] nest exception is org.hibernate.QueryException: unexpected token: as [Select....]
  这里的两个[Select.....] 内容就上面的sql变量的执行语句.   
  错误在哪里?     
  那个sql语句我单独在plsql下执行没问题.

------解决方法--------------------------------------------------------
Select a from A as a,B as b     
完全没必要这么写。