code: public Observable<ServiceResponse<ExpressRouteCircuitsArpTableListResultInner>> beginListArpTableWithServiceResponseAsync(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";
          return service.beginListArpTable(resourceGroupName, crossConnectionName, peeringName, devicePath, this.client.subscriptionId(), apiVersion, this.client.acceptLanguage(), this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<ExpressRouteCircuitsArpTableListResultInner>>>() {
                  @Override
                  public Observable<ServiceResponse<ExpressRouteCircuitsArpTableListResultInner>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<ExpressRouteCircuitsArpTableListResultInner> clientResponse = beginListArpTableDelegate(response);
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Gets the currently advertised ARP table 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 to the ExpressRouteCircuitsArpTableListResultInner object