Spring4.2mvc 406错误

	@ResponseBody
	@RequestMapping("/page-json.html")
	public  List<Menu> dataTableDemo(
			HttpServletRequest request, HttpServletResponse response,
			Model model) {
		List<Menu> list = (List<Menu>) menuRepository.findAll();
 		return list ;
	}

 这个请求 406 错误

  愁了大半夜， 改成 @RequestMapping("/page-json") 就一下正常了，为什么？

@ResponseBody
	@RequestMapping("/page-json")
	public  List<Menu> dataTableDemo(
			HttpServletRequest request, HttpServletResponse response,
			Model model) {
		List<Menu> list = (List<Menu>) menuRepository.findAll();
 		return list ;
	}