AlecKotovichSAM

boolean backgroundLoading = true;

Image image = new Image(url, backgroundLoading);
ImageView imageView = new ImageView(image);

stackPane.getChildren().add(imageView);       
stackPane.setStyle("-fx-background-color: #3270B7");

AlecKotovichSAM

public class App extends Application {
 
    @Override
    public void start(Stage stage) {
        var javaVersion = SystemInfo.javaVersion();
        var javafxVersion = SystemInfo.javafxVersion();
 
        var label = new Label("Hello, JavaFX " + javafxVersion + ", running on Java " + javaVersion + ".");
        var scene = new Scene(new StackPane(label), 640, 480);
        stage.setTitle("SaM Solutions JavaFX App");