code: public ExpressRouteCircuitInner beginCreateOrUpdate(String resourceGroupName, String circuitName, ExpressRouteCircuitInner parameters) {
          return beginCreateOrUpdateWithServiceResponseAsync(resourceGroupName, circuitName, parameters).toBlocking().single().body();
      }
docs: Creates or updates an express route circuit.
  
  @param resourceGroupName The name of the resource group.
  @param circuitName The name of the circuit.
  @param parameters Parameters supplied to the create or update express route circuit 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 ExpressRouteCircuitInner object if successful.