code: public String route(String controllerClass, String method) {
          String route = router.getReverseRouteFor(controllerClass, method);
          if (route == null) {
              throw new TemplateProcessingException(ERR_FIND_ROUTE + controllerClass + "#" +
                      method);
          }
          return route;
      }
docs: Retrieves the reverse route (url) of the specified action.
  
  @param controllerClass the controller
  @param method          the method
  @return the url
  @throws org.thymeleaf.exceptions.TemplateProcessingException if the route cannot be found