javabean问题


  最近做一个JSP的课程设计，在用到JAVABEAN时每次都会报错，找了书上的一些javabean的源代码都会报出同样的错误：type Exception report
 
message description The server encountered an internal error () that prevented it from fulfilling this request.
 
exception org.apache.jasper.JasperException: /webshopping/WebRoot/loginCheck.jsp (line: 9, column: 0) The value for the useBean class attribute com.wy.member.user is invalid.
 
程序源代码如下：
 loginCheck.jsp:
 <%@ page language="java" contentType="text/html;charset=gb2312" %>
 <%@ page import="java.sql.*,com.wy.member.*," %>
 <HTML>
 <HEAD>
     <title>网上商品交易平台</title>
     <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
 </HEAD>
 <BODY>
 <jsp:useBean id="user" scope="session" class="com.wy.member.user" />
 <%
     String userName=request.getParameter("txtloginName");
     String userPassword=request.getParameter("txtpassword");
     if (user.isValidUser(userName,userPassword))
     {
         %>
         <center><font size="5" color="#FF0000"><b>登陆成功</b></font></center>
         <br><br>
           <center><input type="button" name="goback" value="返回" onClick="javascript:window.history.go(-1)"></center>
         <%    
    }
     else
     {
     %>
         <center><font size="5" color="#FF0000"><b>登陆失败，请检查您的用户名和密码</b></font></center>
         <br><br>
           <center><input type="button" name="goback" value="返回" onClick="javascript:window.history.go(-1)"></center>
     <%
     }
     %>
 </BODY>
 </HTML>
 
UserLogin.jsp:
 <%@ page language="java" contentType="text/html;charset=gb2312" %>
 <html>
 <head>
     <title>网上商品交易平台</title>
     <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
 <SCRIPT ID=clientEventHandlersJS LANGUAGE=javascript>
 <!--
 function form1_onsubmit()
 {
 
    if (form1.txtloginName.value =="")
     {
         alert("请填写用户名！");
         form1.txtloginName.focus();
         return false;
     }
     if (form1.txtpassword.value =="")
     {
         alert("请填写密码！");
         form1.txtpassword.focus();
         return false;
     }
 }
 function userRegister()
 {
     window.open("userRegister.jsp");
 
}
 function getmypassword()
 {
     window.open("getPassword.jsp");
 
}
 
//-->
 </SCRIPT>
 
</head>
 <table border="0" width="100%" height="299">
   <tr>
     <td width="10%" height="183"></td>
     <td width="80%" height="183" align=center valign="middle">
       <form name=form1 method="post" target="_top" action="loginCheck.jsp" onSubmit="return form1_onsubmit()">
         <div align="center">
           
          <table width="346" height="68" border="0">
             <tr>
               <td width="100"> 
              <font color="#000099" size="3" face="Arial, Helvetica, sans-serif"><strong>用户名：</strong></font>
               </td>
               <td width="155">
               <input name="txtloginName" style="HEIGHT: 20px; WIDTH: 150px" size="50" maxlength="50">
              </td>
               <td width="77" valign="middle">
                 
              </td>
             </tr>
             <tr>
               <td height="39">
               <font color="#000099" size="3" face="Arial, Helvetica, sans-serif"><strong>密码：</strong></font>
               </td>
               <td>
                 <input name="txtpassword" style="HEIGHT: 20px; WIDTH: 150px" size="20" maxlength="20" type="password">
               </td>
               <td>&nbsp;</td>
             </tr>
             <tr>
                 <td>
                 <font color="#000099" size="3" face="Arial, Helvetica, sans-serif"><strong>用户类型：</strong></font>
                 </td>
                 <td colspan="2">
                     <select name="userType">
                         <option value="1" selected>普通用户</option>
                         <option value="2">商家</option>
                         <option value="0">管理员</option>
                     </select>
                 </td>
             </tr>
           </table>
                 
          <br>
           <br>
           <input type="submit" name="btnSubform" value="登录">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
           <input type="reset" name="reset" value="重填">
           </div>
        
      </form>
 </td>
     <td width="10%" height="183"></td>
   </tr>
 </table>
 </html>
 
user.java:
 package com.wy.member;
 
import com.wy.tool.*;
 import java.sql.*;
 import java.text.*;
 
public class user extends executeWay{
     private int id;;
     private String number;
     private String password;
     private String name;
     private Integer age;
     private String telphone;
     private String email;
     private String strSql;
     
    public user(){
         id=0;
         number="";
         password="";
         name="";
         age=1;
         telphone="";
         email="";
     }
                public boolean isValidUser(String number,String password){
         strSql="select * from tb_member where number='"+number+"'   and password='"+password+"'";
                           
            
         try{
                ResultSet rs = super.exeSqlQuery(strSql);      
             
             if (rs.next()){
                 id=rs.getInt("id");
                 number=rs.getString("number");
                 password=rs.getString("password");
                 name=rs.getString("name");
                 age=rs.getInt("age");
                 telphone=rs.getString("telphone");
                 email=rs.getString("email"); 
                return true;
             }
             else{
                 return false;
             }
 
        }
         catch(Exception ex){
                 
            return false;
         }
         finally{
               
         }
 
       }
 }
 在Myeclipse里是没有错误的，但是在TOMCAT里一运行就出现错误，这是为什么呢？（路径应该没有问题，user类的.class文件也存在）
 请JSP技术牛人帮忙看一下是什么原因。谢谢！