[JQuery] ajax2 : 400 error발생

관련글 : exhibitlove.tistory.com/118

var param = {};
param = JSON.stringify(param);
$.ajax({
	type : "POST",
	url : "/qlty/consumerInfo/setSftridn",
	data : param, // 
	dataType : "json",
	contentType : "application/json;charset=UTF-8",
	success : function(data) {
		console.log(data)
		
	}
	,error : function(request, error) {
		console.log("message: " + request.responseText + ", error:" + error);
	}
});	

@RequestMapping(value = "/qlty/consumerInfo/setSftridn", method = RequestMethod.POST)
public @ResponseBody ModelAndView setSftridn(@RequestBody Map<String,Object> params) throws Exception {
	ModelAndView mv = new ModelAndView("jsonView");
	try {
		int count = coltWaterInfosService.setSftridn(params);
		mv.addObject("count", count);
	} catch (Exception e) {
		e.printStackTrace();
	}
	return mv;
}

java 메소드에서 params로 parameter를 받고 있는데, $.ajax() 호출시 data:param을 넣지 않으면 400 error가 발생한다.