code: public ControllerInner beginCreate(String resourceGroupName, String name, ControllerInner controller) {
          return beginCreateWithServiceResponseAsync(resourceGroupName, name, controller).toBlocking().single().body();
      }
docs: Creates an Azure Dev Spaces Controller.
  Creates an Azure Dev Spaces Controller with the specified create parameters.
  
  @param resourceGroupName Resource group to which the resource belongs.
  @param name Name of the resource.
  @param controller Controller create parameters.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws ErrorResponseException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the ControllerInner object if successful.