Servlet层的操作

    public List selectByUser(String userName,String userPassword){
         List list=new ArrayList();
         try{
        
         conn=baseDao.getConnection();
         String sql="select * from admin where userName=? and userPasswrod=?";
         pStatement=conn.prepareStatement(sql);
         pStatement.setString(1,userName);
         pStatement.setString(2,userPassword);
         rs=pStatement.executeQuery();
         while(rs.next()){
         Admin admin=new Admin();
         admin.setUserName(rs.getString("userName"));
         admin.setUserPassword(rs.getString("userPasswrod"));
         admin.setName(rs.getString("name"));
         admin.setAge(rs.getInt("age"));
         admin.setBirthday(rs.getString("birthday"));
         admin.setNation(rs.getString("nation"));
         admin.setSex(rs.getString("sex"));
         list.add(admin);
         }
         }catch(Exception e){
         e.printStackTrace();
         }finally{
         baseDao.closeResultSet(rs);
         baseDao.closePreparedStatement(pStatement);
         baseDao.closeConnection(conn);
         }
         return list;
        }
这是在实体层上写的方法。我在Servlet里面进行调用
 List list= eService.selectByUser(userName, userPassword);//红色部分报错
          for(int i=0;i<list.size();i++){
          enterService es=list.get(i);
           session.setAttribute("list", es);
          }