struts2标签在jsp页面取不到值，新手求学，老手赐教

问题情况：设置struts框架后，建立index.jsp页面，HelloWorldAction.java,MessageStore.java,
我想通过index页面请求action获取MessageStore.java中的message的值然后输出到HelloWorld页面,但是<s:property value="messageStore.message" default="no value"/>后value没获取值。
全部代码和主要设置如下：
index .jsp
<%@page import="com.opensymphony.xwork2.util.*" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Basic Struts 2 Application - Welcome</title>
</head>
<body>
<h1>Welcome To Struts 2!</h1>
<p><a href="<s:url action='hello'/>">Hello World</a></p>
</body>
</html>



HelloWorld.jsp:

<%@page import="com.opensymphony.xwork2.util.*" %>
<%@ taglib prefix="s" uri="/struts-tags" %>

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Hello World!</title>
</head>
<body>
<h2><s:property value="messageStore.message" default="no value"/></h2>
<%%>
</body>
</html>



MessageStore.java:


package hellomodel;

public class MessageStore {
private String message;
public MessageStore(){
setMessage("Hello,Struts user!");
}
public void setMessage(String message){
this.message=message;
}
public String getMesssage(){
return message;
}

}


HelloWorldAction.java:


package helloaction;
import hellomodel.MessageStore;
import com.opensymphony.xwork2.ActionSupport;

public class HelloWorldAction extends ActionSupport {

/**
*
*/
private static final long serialVersionUID = 1L;
private MessageStore messageStore;
public String excute() throws Exception{
messageStore=new MessageStore();
//this.setMessageStore(msg);
return SUCCESS;
}
public MessageStore getMessageStore() {
return messageStore;
}

public void setMessageStore(MessageStore messageStore) {
this.messageStore = messageStore;
}
}


struts.config:

<?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">

<struts>

<constant name="struts.devMode" value="true" />

<package name="basicstruts2" extends="struts-default">

<action name="index">
<result>/index.jsp</result>
</action>
<action name="hello" class="helloaction.HelloWorldAction" method="excute" >
<result>/HelloWorld.jsp</result>
</action>
</package>
</struts>


web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>Basic_Struts2_Ant</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<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>
</web-app>



其中红色部分是我想获得字符串“Hello,Struts user!"的地方，但是只显示默认的no value，鼓捣3天了，请给个明白的解释吧，谢谢