ajax报系统异常

ajax报系统错误
java代码

 @RequestMapping("/get_largeFacility.do")
    public void getLargeFacility(HttpServletRequest req,
            HttpServletResponse res, HttpSession session) throws IOException {
        Integer id = !Check.isNullStr(req.getParameter("id")) ? Integer
                .valueOf(req.getParameter("id")) : 0;
        Map<String, Object> modelMap = new HashMap<String, Object>();
        if (id > 0) {

            String queryString = "SELECT facility FROM TjkwShqshFacilityFee as facility WHERE facility.feeId = "
                    + id;
            List<TjkwShqshFacilityFee> facility = (List<TjkwShqshFacilityFee>) this.dao
                    .search(queryString);
            modelMap.put("errorCode", 0);
            modelMap.put("facility", facility);
        } else {
            modelMap.put("errorCode", 1);
            modelMap.put("errorMessage", CommonMessage.NO_RECORD);
        }
        JSONObject jsonObject = JSONObject.fromObject(modelMap);
        res.getWriter().print(jsonObject.toString());

    }

ajax代码

  function showEditEquipmentDialog(id) {
                //根据id获取大型设备的信息
                $
                        .ajax({
                            url : "../jcjh/get_largeFacility.do?id=" + id,
                            type : 'get',
                            dataType : "json",
                            success : function(data, status, xhr) {
                                if (data.errorCode == 0) { 
 
                                    $("#fee_id").val( data.facility.feeId);
                                    $("#fac_name_id").val(data.facility.nameSize);
                                    $("#unit_id").val( data.facility.unit);
                                    $("#buy_num_id").val(  data.facility.facilityAmount);
                                    $("#price_id").val(data.facility.unitPrice);
                                    $("#allocate_funds_id").val(data.facility.allocateFunds);
                                    $("#reasons_id").val(data.facility.reasons);
                                    $("#equipment_dialog").dialog("open");
                                } else {
                                    popDialog("messageDialog",
                                            data.errorMessage);
                                }
                            },
                            error : function(response) {
                                popDialog("messageDialog", "系统错误！");
                            }
                        });
            } 
 

怎么样才能把data里的值传过来并取出？？可能是json方面的问题 ，求大神指教 Ajax JSON
[解决办法]
设个断点，看这个是个什么内容？
[解决办法]
jsonObject.toString()
[解决办法]
success:function(data){//success这样写试试
  console.log(data);//浏览器控制台打开查看结果
}

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