struts2 json problem

[James Kafir]

Hi all,
I am trying to obtain JSON object in the following code. The problem is, I am getting the object twice. Any help is appreciated.

    public class MenuAction {
    	private String ms;
    	private List<Menu> menus;
    
    	public String getMs() {
    		return ms;
    	}
    
    	public void setMs(String ms) {
    		this.ms = ms;
    	}
    	
    	//execute method
    	public String execute(){
    		menus = new ArrayList<Menu>();
    		Menu af = new Menu();
    		af.setText("A Folder");
    		af.setCls("folder");
    		af.setLeaf(false);
    		af.setId(10);
    		menus.add(af);
    		
    		List<Menu> aList = new ArrayList<Menu>();
    		Menu menu;
    		menu = new Menu();
    		menu.setText("A Child 1");
    		menu.setCls("file");
    		menu.setLeaf(true);
    		menu.setId(11);
    		aList.add(menu);
    		menu = new Menu();
    		menu.setText("A Child 2");
    		menu.setCls("file");
    		menu.setLeaf(true);
    		menu.setId(12);
    		aList.add(menu);
    		af.setChildren(aList);
    		
    		JSONArray ja = JSONArray.fromObject(menus);
    		try {
    			ms = ja.toString();
    		} catch (Exception e){
    			ms = "ss";
    		}
    		System.out.println(ms);
    		return Action.SUCCESS;
    	}
    } 

what it prints is the following.

    [{"children":[{"children":[],"cls":"file","id":11,"leaf":true,"text":"A Child 1"},{"children":[],"cls":"file","id":12,"leaf":true,"text":"A Child 2"}],"cls":"folder","id":10,"leaf":false,"text":"A Folder"}]

    [{"children":[{"children":[],"cls":"file","id":11,"leaf":true,"text":"A Child 1"},{"children":[],"cls":"file","id":12,"leaf":true,"text":"A Child 2"}],"cls":"folder","id":10,"leaf":false,"text":"A Folder"}]

Basically it is producing same json string twice. Why is it doing so?