JSP用连接池连数据库的问题

各位高手麻烦帮我看下面这三个文件(一个jsp,两个.java),我在IE输入地址时,提示如下错误(代码应该没有错,不知是不是设置的问题),望高手指教,不胜感激:

D:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\_\shopping\index_jsp.java:44: package mybean does not exist
      mybean.DBConnManager connManager = null;
            ^



An error occurred at line: 2 in the jsp file: /shopping/index.jsp

Generated servlet error:
D:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\_\shopping\index_jsp.java:46: package mybean does not exist
        connManager = (mybean.DBConnManager) pageContext.getAttribute("connManager", PageContext.APPLICATION_SCOPE);
                             ^



An error occurred at line: 2 in the jsp file: /shopping/index.jsp

Generated servlet error:
D:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\_\shopping\index_jsp.java:49: package mybean does not exist
            connManager = (mybean.DBConnManager) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "mybean.DBConnManager");
                                 ^

//下面这两个是连接池,下面两个文件都放在一个mybean的包里.

package mybean;
import java.sql.*;
import java.util.*;

public class DBConnPool {
  //正在使用连接的数量
  private int using;
  //目前可用的连接数,即空闲连接
  private Vector connections=new Vector();
  //最大连接数
  private int maxconn;
  //连接池名
  private String poolname;
  //数据库标识
  private String dbid;
  //驱动程序名
  private String drivername;
  //数据库帐号
  private String username;
  //数据库密码
  private String passwd;

  public DBConnPool(String poolname,String dbid,String drivername,
                    String username,String passwd,int maxconn){
    this.poolname=poolname;
    this.drivername=drivername;
    this.dbid =dbid;

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