在struts2中使用struts-menu生成动态树遇到问题！

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在struts2中使用struts-menu生成动态树遇到问题！20

使用xml做为动态树的数据源
xml如下：

<?xml version="1.0" encoding="utf-8"?>
<root>
	<menu>
		<id>1</id>
		<name>test</name>
		<parent_name></parent_name>
		<title>tes</title>
		<location>/test.jsp</location>
		<target>main</target>
	</menu>

</root>

action代码如下，使用dom4j解析xml：

public String execute() throws Exception {
		ArrayList<Map> ary=new ArrayList<Map>();   
	   Document doc=getDocument(getRoleXML()); //获取xml
			Element roleTree = doc.getRootElement();
			Iterator users_role = roleTree.elementIterator(); 
			while(users_role.hasNext()){
				Element role = (Element)users_role.next();
				 Map temp=new HashMap();    
		            temp.put("id",role.elementTextTrim("id"));    
		            temp.put("name",role.elementTextTrim("name"));    
		            temp.put("parent_name",role.elementTextTrim("parent_name"));    
		            temp.put("title",role.elementTextTrim("title"));    
		            temp.put("location",role.elementTextTrim("location"));    
		            temp.put("location",role.elementTextTrim("target"));
		            ary.add(temp);    

			}
	
		
		 ServletContext sc = request.getSession().getServletContext();
		 MenuRepository repository = new MenuRepository();    
         MenuRepository defaultRepository = (MenuRepository)sc.getAttribute(MenuRepository.MENU_REPOSITORY_KEY); 
	        repository.setDisplayers(defaultRepository.getDisplayers());    
	        ArrayList result=ary;    
	        Iterator iterator=result.iterator();    
	        int id=0;    
	        while(iterator.hasNext()){    
	            MenuComponent mc = new MenuComponent();    
	            Map row=(Map)result.get(id);    
	            String name=(String)row.get("name");    
	            mc.setName(name);    
	            String parent=(String)row.get("parent_name");    
	             if (parent != null) {    
	                    MenuComponent parentMenu = repository.getMenu(parent);    
	                    if (parentMenu == null) {    
	                         parentMenu = new MenuComponent();    
	                        parentMenu.setName(parent);    
	                        repository.addMenu(parentMenu);    
	                    }    
	   
	                    mc.setParent(parentMenu);    
	                }    
	                
	              String title = (String) row.get("title");    
	              mc.setTitle(title);    
	              String location = (String) row.get("location");    
	              mc.setLocation(location); 
	              String target=(String) row.get("target");
	              mc.setTarget(target);
	              repository.addMenu(mc);    
	              iterator.next();    
	              id++;    
	        }   
	        
	        sc.setAttribute("repository", repository);    
		
		return SUCCESS;		
	}

jsp代码如下：

<div class="container">
<script type="text/javascript">
<menu:useMenuDisplayer name="Velocity" config="../templates/xtree.html"
  repository="repository">
 <c:forEach var="menu" items="${repository.topMenus}">   
            <menu-el:displayMenu name="${menu.name}"/>   
 </c:forEach>   

</menu:useMenuDisplayer>
</script>
</div>

但是始终报错如下：
javax.servlet.ServletException: The menu repository could not be found.

请求帮助，谢谢！！

Struts