code: public RouteInner createOrUpdate(String resourceGroupName, String routeTableName, String routeName, RouteInner routeParameters) {
          return createOrUpdateWithServiceResponseAsync(resourceGroupName, routeTableName, routeName, routeParameters).toBlocking().last().body();
      }
docs: Creates or updates a route in the specified route table.
  
  @param resourceGroupName The name of the resource group.
  @param routeTableName The name of the route table.
  @param routeName The name of the route.
  @param routeParameters Parameters supplied to the create or update route operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the RouteInner object if successful.