code: public Observable<ServiceResponse<ExpressRouteCrossConnectionsRoutesTableSummaryListResultInner>> listRoutesTableSummaryWithServiceResponseAsync(String resourceGroupName, String crossConnectionName, String peeringName, String devicePath) {
          if (resourceGroupName == null) {
              throw new IllegalArgumentException("Parameter resourceGroupName is required and cannot be null.");
          }
          if (crossConnectionName == null) {
              throw new IllegalArgumentException("Parameter crossConnectionName is required and cannot be null.");
          }
          if (peeringName == null) {
              throw new IllegalArgumentException("Parameter peeringName is required and cannot be null.");
          }
          if (devicePath == null) {
              throw new IllegalArgumentException("Parameter devicePath is required and cannot be null.");
          }
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          final String apiVersion = "2018-06-01";
          Observable<Response<ResponseBody>> observable = service.listRoutesTableSummary(resourceGroupName, crossConnectionName, peeringName, devicePath, this.client.subscriptionId(), apiVersion, this.client.acceptLanguage(), this.client.userAgent());
          return client.getAzureClient().getPostOrDeleteResultAsync(observable, new TypeToken<ExpressRouteCrossConnectionsRoutesTableSummaryListResultInner>() { }.getType());
      }
docs: Gets the route table summary associated with the express route cross connection in a resource group.
  
  @param resourceGroupName The name of the resource group.
  @param crossConnectionName The name of the ExpressRouteCrossConnection.
  @param peeringName The name of the peering.
  @param devicePath The path of the device.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable for the request