tomcat5.0+sql配置连接池错误:Name sqlserver is not bound in this Context,查了好多资料都不行,大家帮帮忙啊!!!急!!急!!!
我用tomcat图形上面配置连接池 
 配置信息如下:        
 JNDI   Name:      jdbc/sqlserver            
 Data   Source   URL:      jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=CyxtExploristjdbc:microsoft:sqlserver://localhost:1433;DatabaseName=CyxtExplorist         
 JDBC   Driver   Class:            com.microsoft.jdbc.sqlserver.SQLServerDriver   
 User   Name:            sa 
 Password:            sa 
 Max.   Active   Connections:            4 
 Max.   Idle   Connections:            2 
 Max.   Wait   for   Connection:         5000   
 点击save再点击commit   changes   后自动在localhost下生成一些配置文件但在JSP文件测试时出现Name   sqlserver   is   not   bound   in   this   Context的错误。     
 JSP代码: 
  <%@   page   contentType= "text/html;   charset=gb2312 "   language= "java "      
errorPage= " "   %>  
  <%@   page   import= "java.sql.* "%>  
  <%@   page   import= "javax.sql.* "%>  
  <%@   page   import= "javax.naming.* "%>  
  <html>  
  <head>  
  <meta   http-equiv= "Content-Type "   content= "text/html;   charset=gb2312 ">  
  <title> 通过Tomcat连接池连接SQL   Server数据库 </title>  
  <style   type= "text/css ">  
  <!-- 
 .style1   {color:   #0000FF} 
 -->  
  </style>  
  </head>  
  <body>  
  <div   align= 'center '>  
  <span   class= "style1 ">  
  <% 
 DataSource   ds   =   null; 
 Connection   conn=null; 
 Statement   stmt=null; 
 ResultSet   rs=null;   
 try{ 
 InitialContext   ctx=new   InitialContext(); 
 ds=(DataSource)ctx.lookup( "java:comp/env/jdbc/sqlserver ");   
 conn   =   ds.getConnection(); 
 } 
 catch(Exception   e){ 
 e.printStackTrace(); 
 } 
 %>  
  <%if(conn!=null){ 
 try{ 
 stmt=conn.createStatement(); 
 rs=stmt.executeQuery( "select   *   from   stu "); 
 %>  
 取得数据库连接成功!!! </span>  
  <table   width= "220 "   border= "1 ">  
        <tr   align= "center ">  
              <td>  <span   class= "style1 "> 姓名 </span>  </td>  
              <td>  <span   class= "style1 "> 年龄 </span>  </td>  
              <td>  <span   class= "style1 "> 职业 </span>  </td>  
        </tr>  
        <%while(rs.next()){ 
       	System.out.println(rs.getInt(1)); 
       	      	System.out.println(); 
 %>    
        </tr>  
        <% 
       } 
       	System.out.println(); 
       %>  
  </table>  
  <% 
 }catch(Exception   e){   
 }%>  
  <%}%>  
  </body>  
  </html>      
 请指教解决方案