there is no action mapped for namespace/ and action name

这是struts.xml代码

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">

<default-action-ref name="index" />

        <global-results>
            <result name="error">/error.jsp</result>
        </global-results>

        <global-exception-mappings>
            <exception-mapping exception="java.lang.Exception" result="error"/>
        </global-exception-mappings>

<action name="login" class="com.laoa.struts.action.MethodAction" method="login">
        <result name="success">ok.jsp</result>
        <result name="input">login.jsp</result>
        </action>
    </package>

</struts>

MethodAction代码

package com.laoa.struts.action;

import com.opensymphony.xwork2.ActionSupport;

public class MethodAction extends ActionSupport {
private String name;
private String password;
public String getName() {
  return name;
}
public void setName(String name) {
  this.name = name;
}
public String getPassword() {
  return password;
}
public void setPassword(String password) {
  this.password = password;
}
public String login() throws Exception {
  if(name.equals("java") && password.equals("java")){
   return SUCCESS;
  }
   else{
    return INPUT;
   }
}
public String add() throws Exception {
  return null;

}
}

web.xml代码

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

<display-name>Struts Blank</display-name>

    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>

</web-app>

<%@ page language="java" pageEncoding="GB2312"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<html>
<body>
<h1></h1>
<s:form action="/MethodAction" method="post">
<table border="0">
<tr>
<td><s:textfield label="姓名：" name="name"></s:textfield></td>
</tr>
<tr>
<td><s:textfield label="密码：" name="password"></s:textfield></td>
</tr>
<tr align="center">
<td >
<s:submit></s:submit><s:reset></s:reset>
</td>
</tr>
</table>
</s:form>
</body>
</html>

请哪位仁兄给帮帮忙，我用得是Myeclipse6.0+Tomcat6.0+jdk6.0+struts2.2.3.1

there is no action mapped for namespace/ and action name

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