public SimpleUrlHandlerMapping handlerMapping() {
SockJsService sockJsService = new DefaultSockJsService(taskScheduler());
Map<String, Object> urlMap = new HashMap<String, Object>();
urlMap.put("/game/websocket/**", new SockJsHttpRequestHandler(sockJsService, gameHandler));
SimpleUrlHandlerMapping hm = new SimpleUrlHandlerMapping();
hm.setUrlMap(urlMap);
return hm;
}