[Microsoft][SQLServer 2000 Driver for JDBC]Object has been closed.???

请教大虾:
<%@ page language="java" contentType="text/html;charset=gb2312"%>
<%@ page import="java.util.*"%>
<%@ page import="java.sql.*"%>
<%@ page import="com.a123.DBTool.*"%><html>
       <head>
           <TITLE></TITLE>
       </head>
       <body>
           <%
            String sql = "select name,password from users";
            Connection con = null;
            Statement stmt = null;
            ResultSet rst = null;
            try
            {
                con = DBConnect.fetchConnection();
                if(con != null)
                {
                   out.println("数据库连接成功!");
                }
                stmt = con.createStatement();
                
                rst = stmt.executeQuery(sql);
                while(rst.next())
                {
                   out.println("<p>"+rst.getString(1)+"</p>");
                   out.println("<p>"+rst.getString(2)+"</p>");
                   out.println("*********************************");
                 }
                rst.close();
                stmt.close();
                con.close();
                
                
            }
            catch(SQLException e)
            {
                //
                out.println(e.getMessage());               
                                
                out.println("execute  faile01!!!");
            }
            catch(Exception ee)
            {
                //
                out.println("execute  faile02!!!");
            }
            finally
            {
                if(con != null)
                  DBConnect.releaseConneciont(con);                    
            }          
           
           %>
       </body>
       
</html>运行这个jsp页面时出现以下异常:
     [Microsoft][SQLServer 2000 Driver for JDBC]Object has been closed.???
请问各位大虾,问题出在哪了?
谢谢!