SpringMVC ajax请求-java.io.EOFException：由于输入结束，没有内容可以映射到Object

这是对我有用的控制器的更改

@RequestMapping(value = "getNewCoordinatesForMarkers.htm", method = {RequestMethod.POST},produces = "application/json; charset=utf-8")    public @ResponseBody  Marker getNewCoordinates(@RequestBody Marker json)throws Exception{        JSonObject jsonObj = JSONObject.fromObject(json);        ObjectMapper mapper = new ObjectMapper();         Marker citizen = mapper.readValue(jsonObj.toString(), new TypeReference<Marker>(){});        logger.info("Getting Markers");        Marker citizenMarker = this.markerManager.getNextLocation(citizen);        return citizenMarker;    }