请问在浏览器(tomcat5)里运行jsp+javaBean，要怎么配置环境变量啊，我刚学，在jb里能运行，但是在浏览器里就出现下面的错误啊,如果只是jsp就能调试出来，但是现在我用javaBean就不行了，请大家帮帮忙好么，谢谢了!

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: /jekyweb/guestBook/index2.jsp(15,0) The value for the useBean class attribute jeky.db_conn is invalid.

目录结构：

D:\web\jsp\Tomcat 5.0\webapps\ROOT\jekyweb\guestBook\index2.jsp

D:\web\jsp\Tomcat 5.0\webapps\ROOT\jekyweb\guestBook\jeky\db_conn.class

代码如下：

//index2.jsp

index

JBuilder Generated JSP

Connection conn = Conndb.getConnection();

try{

Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);

ResultSet rs = stmt.executeQuery("select * from guestBookData");

while(rs.next()){

out.println(rs.getString("userTime"));

}

rs.close();

stmt.close();

Conndb.close();

}catch(Exception e){e.printStackTrace();}

%>

//db_conn.java

package jeky;

import java.io.*;

import javax.servlet.http.*;

import java.sql.*;

public class db_conn implements HttpSessionBindingListener {

public void valueBound(HttpSessionBindingEvent event){}//当变量加入时Session时自动执函数

public void valueUnbound(HttpSessionBindingEvent event){}//当变量关闭时Session时自动执函数

private Connection conn = null;

public db_conn() {//建立数据库连接

BulidConnection();

}

private void BulidConnection(){//建立数据库连接方法

try{

/*Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");

String url = "jdbc:microsoft:sqlserver://210.38.196.123:1433;DatabaseName=guestBook";

String user="sa";

String password="jeky";

conn = DriverManager.getConnection(url,user,password);*/

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

conn = DriverManager.getConnection("jdbc:odbc:guestBook","sa","jeky");

}catch(Exception ex){

System.out.print(ex.toString());

}

}

public Connection getConnection(){

if(conn == null)//如果conn为空，重新建立连接

BulidConnection();

return conn;

}

public void close(){

try{

conn.close();//关闭连接

conn = null;

}catch(SQLException ex){}

}

}

//我把db_conn.java在jb里面编译后把db_conn.class拷贝到

D:\web\jsp\Tomcat 5.0\webapps\ROOT\jekyweb\guestBook\jeky\目录下，

在D:\web\jsp\Tomcat 5.0\webapps\ROOT\jekyweb\guestBook\目录下放index2.jsp文件

set classpath=%classpath%;D:\web\jsp\Tomcat 5.0\webapps\ROOT\jekyweb\guestBook\

就出这样的错了，希望各位帮帮我啊![emb10]