code: public RouteTableInner createOrUpdate(String resourceGroupName, String routeTableName, RouteTableInner parameters) {
          return createOrUpdateWithServiceResponseAsync(resourceGroupName, routeTableName, parameters).toBlocking().last().body();
      }
docs: Create or updates a route table in a specified resource group.
  
  @param resourceGroupName The name of the resource group.
  @param routeTableName The name of the route table.
  @param parameters Parameters supplied to the create or update route table 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 RouteTableInner object if successful.