javabean使用连接池问题,SOS,在线等ing

[CharonOk]

连接池配置好了,且在jsp中测试也通过了,代码:
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="javax.naming.Context" %>
<%@ page import="javax.sql.DataSource" %>
<%@ page import="javax.naming.InitialContext" %>
<%@ page import="java.sql.*" %>

<%
DataSource ds = null;
try
{
Context initCtx = new InitialContext();
out.println(1);
Context envCtx = (Context)initCtx.lookup("java:comp/env");
out.println(2);
ds = (DataSource)envCtx.lookup("jdbc/Jsp_BBS");
out.println(3);
if (ds != null)
{
out.println("已经获得DataSource!");
out.println("<br>");
Connection conn = ds.getConnection();
Statement stmt = conn.createStatement();
out.println("success!");
}
}
catch(Exception e)
{
out.println(e.getMessage());
}
%>

但在javabean中使用却出错了,提示的错误:
Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial

代码是:
package com.bean;

import java.sql.*;

import javax.naming.*;
import javax.sql.*;

public class dbControl
{
DataSource ds = null;
Connection conn;
String strSql;
final static String datasource = "java:comp/env/jdbc/Jsp_BBS";

public dbControl()
{
try
{
Context initCtx = new InitialContext();
//lookup(String name)：返回与指定的名字绑定的对象,获得数据库连接工厂
ds = (DataSource)initCtx.lookup("java:comp/env/jdbc/Jsp_BBS");
//Context initCtx = new InitialContext();
//Context envCtx = (Context)initCtx.lookup("java:comp/env");
//ds = (DataSource)initCtx.lookup(datasource);
conn = ds.getConnection();
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
}

public dbControl(String strSql)
{
this();
this.strSql = strSql;
}
public static void main(String [] args)
{
dbControl db = new dbControl();
}
}

[CharonOk]

没人帮忙吗？无语