@RequestMapping(value = "/speakers/{hallEventId}", method = RequestMethod.GET)
    public ModelAndView speakersPage(
            final HttpServletRequest request,
            final HttpServletResponse response,
            @PathVariable(value = "hallEventId") final String hallEventIdStr
    ) throws IOException {
        ModelAndView modelAndView = new ModelAndView("speakers-layout");
        if (hallEventIdStr == null) {
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
            modelAndView = null;
        } else {
            modelAndView.addObject(hallEventIdStr);
        }

        return modelAndView;
    }