写完一段jsp和servlet后运行的结果

总是找不到servlet，不知道是不是我的软件问题，我的软件环境是jbuilder2006,sql server2000,操作系统winXP sp2
以下是问题代码：HTTP Status 500 - type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception javax.servlet.ServletException: Wrapper cannot find servlet class updatepro.updateservlet or a class it depends on
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
java.lang.Thread.run(Thread.java:595)
root cause java.lang.ClassNotFoundException: updatepro.updateservlet
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1332)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1181)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
java.lang.Thread.run(Thread.java:595)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.9 logs.Apache Tomcat/5.5.9

解决方案 »

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可以从2个方面确认。
1，如果用到了invoker，确认容器的web.xml文件中，invoker部分是否打开。
2，如果没用，确认在你得web.xml中配置了servlet的映像。
root   cause   java.lang.ClassNotFoundException:   updatepro.updateservlet
检查一下这个class是不是在WEB-INF/classes或lib里面的jar里。并且要注意是 updatepro/updateservlet.class，注意前面的路径。_________________
欢迎到我在技术圈的Java圈子做客:Java Guru
jsp的代码：
<%@page contentType="text/html; charset=GBK"%>
<html>
<head>
<title>login</title>
</head>
<body bgcolor="#ffffff">
<h1 align="center">请登陆后更改个人信息</h1>
<br/>
<hr/>
<br/>
<form name="form1" action="updateservlet" method="post" >
<table border="0" cellpadding="0" cellspacing="0" width="500px" align="center">
  <tr>
    <td width="150px">请输入登陆名：</td>
    <td width="350px">
      <input name="LoginName" type="text"/>
    </td>
  </tr>
  <tr>
    <td width="150px">请输入口令：</td>
    <td width="350px">
      <input name="PassWord" type="password" />
    </td>
  </tr>
  <tr>
    <td colspan="2">
      <input type="submit" value="登　陆" name="button1"/>
          
      <input type="reset" value="重　置" name="button2"/>
    </td>
  </tr>
</table>
</form>
</body>
</html>*******************************************分割线*********************************************
servlet代码：
package updatepro;import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.sql.*;
import updatepro.DBBean;public class updateServlet extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=GBK";
    Connection conn = null;
    Statement stat = null;
    PreparedStatement pstat = null;
    ResultSet rs = null;
    //HttpSession sess = new    //Initialize global variables
    public void init() throws ServletException {
    }
            //连接数据库
    public void getConn(){
        try {
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            conn = DriverManager.getConnection("jdbc:odbc:test","sa","");
            System.out.println("数据库连接成功！");
        } catch (Exception ex) {
            ex.printStackTrace();
            System.out.println(ex);
            System.out.println("连接数据库失败");
        }    }
    public void closeConn(){
        try {
            if(rs != null){
                rs.close();
            }
            if(pstat != null){
                pstat.close();
            }
            if(stat != null){
                stat.close();
            }
            if(conn != null){
                conn.close();
            }
            System.out.println("关库成功！");
        } catch (Exception ex) {
            ex.printStackTrace();
            System.out.println("关库错误：" + ex);
        }
    }
    public ResultSet searchSql(String sql){
        //String sql = "select * from UserInfo";
        try {
            stat = conn.createStatement(1005,1008);
            rs = stat.executeQuery(sql);
            System.out.println("查询ok！");
        } catch (Exception ex) {
            ex.printStackTrace();
            System.out.println("查询失败！");
        }
        return rs;
    }
    //Process the HTTP Get request
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {        //HttpSession sess = request.getSession();
        //String LoginName = (String)sess.getAttribute("LoginName");
        //String PassWord = (String)sess.getAttribute("PassWord");
/***************************************************传值测试区域**************************************/
        String LoginName = request.getParameter("LoginName");
        System.out.println(LoginName);
        //if (LoginName == null) {
        //    LoginName = "";
        //}
        String PassWord = request.getParameter("PassWord");
        System.out.println(PassWord);
        //if (PassWord == null) {
          //  PassWord = "";
        //}        /*
        String UserName = request.getParameter("UserName");
        if (UserName == null) {
            UserName = "";
        }        int Age;
        try {
            Age = Integer.parseInt(request.getParameter("Age"));
        } catch (NumberFormatException e) {
            Age = 0;
        }
        String address = request.getParameter("address");
        if (address == null) {
            address = "";
        }
        */
        //this.getConn();
        //this.searchSql("select * from UserInfo where LoginName='"+LoginName+"' and PassWord='"+PassWord+"'");
        //this.closeConn();        response.setContentType(CONTENT_TYPE);
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<head><title>updateServlet</title></head>");
        out.println("<body bgcolor=\"#ffffff\">");
        out.println(LoginName);
        out.print("<br/>");
        out.print(PassWord);
        out.println("</body>");
        out.println("</html>");
        out.close();    }    //Process the HTTP Post request
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        doGet(request, response);
    }    //Clean up resources
    public void destroy() {
    }
}
你的web.xml有没有配置啊
<servlet>
   <servlet-name>##</servlet-name>
   <servlet-class>###</servlet-class>
</servlet>
<servlet-mapping>
   <servlet-name>##</servlet-name>
   <url-pattern>##</url-pattern>
</servlet-mapping>
xml文档是jbuilder自动生成的，不用配置的，servlet的名字我都是从web.xml里边查出来的