DWZ(JUI)，如何正确接收返回的JSON，使页面关闭

[xboyjimmy]

public JSONObject addModule(){
		DwzAjaxResult resultBean=new DwzAjaxResult();  
		Project project=(Project)ActionContext.getContext().getSession().get("PROJECT");
		module.setAddTime(TimeChange.dateToTimestamp(new Date()));
		module.setIsDel(0);
		module.setProject(project);
		System.out.println("action打印"+module.getName()+module.getDes());
		if(moduleBiz.save(module)){
			resultBean=new DwzAjaxResult("200", "添加成功","module-list", "closeCurrent", "admin/module-list.jsp");
		}else{
			resultBean=new DwzAjaxResult("300", "添加失败", "", "", "");
		}
		return JSONObject.fromObject(resultBean);
	}

  <form method="post" action="ModuleAction_addModule" class="pageForm required-validate" onsubmit="return validateCallback(this, navTabAjaxDone);">

错误代码如下：[
Http status: 200 OK
ajaxOptions: parsererror
thrownError: SyntaxError: Unexpected token <
Struts Problem Report
Struts has detected an unhandled exception:

Messages:
net.sf.json.JSONObject cannot be cast to java.lang.String
File: com/opensymphony/xwork2/DefaultActionInvocation.java
Line number: 462
Stacktraces
java.lang.ClassCastException: net.sf.json.JSONObject cannot be cast to java.lang.String