public Observable<ServiceResponse<BuildStepInner>> beginCreateWithServiceResponseAsync(String resourceGroupName, String registryName, String buildTaskName, String stepName) {
        if (this.client.subscriptionId() == null) {
            throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
        }
        if (resourceGroupName == null) {
            throw new IllegalArgumentException("Parameter resourceGroupName is required and cannot be null.");
        }
        if (registryName == null) {
            throw new IllegalArgumentException("Parameter registryName is required and cannot be null.");
        }
        if (buildTaskName == null) {
            throw new IllegalArgumentException("Parameter buildTaskName is required and cannot be null.");
        }
        if (stepName == null) {
            throw new IllegalArgumentException("Parameter stepName is required and cannot be null.");
        }
        final String apiVersion = "2018-02-01-preview";
        final BuildStepProperties properties = null;
        BuildStepInner buildStepCreateParameters = new BuildStepInner();
        buildStepCreateParameters.withProperties(null);
        return service.beginCreate(this.client.subscriptionId(), resourceGroupName, registryName, buildTaskName, stepName, apiVersion, this.client.acceptLanguage(), buildStepCreateParameters, this.client.userAgent())
            .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<BuildStepInner>>>() {
                @Override
                public Observable<ServiceResponse<BuildStepInner>> call(Response<ResponseBody> response) {
                    try {
                        ServiceResponse<BuildStepInner> clientResponse = beginCreateDelegate(response);
                        return Observable.just(clientResponse);
                    } catch (Throwable t) {
                        return Observable.error(t);
                    }
                }
            });
    }
public Observable < ServiceResponse < BuildStepInner > > beginCreateWithServiceResponseAsync ( String resourceGroupName , String registryName , String buildTaskName , String stepName ) { if ( this . client . subscriptionId ( ) == null ) { throw new IllegalArgumentException ( "Parameter this.client.subscriptionId() is required and cannot be null." ) ; } if ( resourceGroupName == null ) { throw new IllegalArgumentException ( "Parameter resourceGroupName is required and cannot be null." ) ; } if ( registryName == null ) { throw new IllegalArgumentException ( "Parameter registryName is required and cannot be null." ) ; } if ( buildTaskName == null ) { throw new IllegalArgumentException ( "Parameter buildTaskName is required and cannot be null." ) ; } if ( stepName == null ) { throw new IllegalArgumentException ( "Parameter stepName is required and cannot be null." ) ; } final String apiVersion = "2018-02-01-preview" ; final BuildStepProperties properties = null ; BuildStepInner buildStepCreateParameters = new BuildStepInner ( ) ; buildStepCreateParameters . withProperties ( null ) ; return service . beginCreate ( this . client . subscriptionId ( ) , resourceGroupName , registryName , buildTaskName , stepName , apiVersion , this . client . acceptLanguage ( ) , buildStepCreateParameters , this . client . userAgent ( ) ) . flatMap ( new Func1 < Response < ResponseBody > , Observable < ServiceResponse < BuildStepInner > > > ( ) { @ Override public Observable < ServiceResponse < BuildStepInner > > call ( Response < ResponseBody > response ) { try { ServiceResponse < BuildStepInner > clientResponse = beginCreateDelegate ( response ) ; return Observable . just ( clientResponse ) ; } catch ( Throwable t ) { return Observable . error ( t ) ; } } } ) ; }
Creates a build step for a build task.

@param resourceGroupName The name of the resource group to which the container registry belongs.
@param registryName The name of the container registry.
@param buildTaskName The name of the container registry build task.
@param stepName The name of a build step for a container registry build task.
@throws IllegalArgumentException thrown if parameters fail the validation
@return the observable to the BuildStepInner object