Hi,

I've made a simple preloader for my app. Nothing special: an image (a semitransparent .png) and a ProgressBar.


This is the FXML:

    <AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="804.0" minWidth="800.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="it.app.preloader.SplashScreenUi">
      <!-- TODO Add Nodes -->
      <children>
          <ImageView fitHeight="804.0" fitWidth="800.0" pickOnBounds="true" preserveRatio="true" smooth="false" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
             <image>
                <Image url="@splash.png" />
             </image>
          </ImageView>
        <ProgressBar fx:id="progressBar" prefWidth="200.0" progress="-1.0" AnchorPane.bottomAnchor="15.0" AnchorPane.leftAnchor="15.0" AnchorPane.rightAnchor="15.0" />
      </children>
    </AnchorPane>

and this is the code:

    public void start(Stage stage) throws Exception {
            log.debug("--->SPLASH SCREEN<-----");
            this.stage = stage;
            if (stage != null) {
                stage.initStyle(StageStyle.TRANSPARENT);
                stage.setScene(createPreloaderScene());
                stage.show();
            }
        }
      
    private Scene createPreloaderScene() {
            try {
                AnchorPane root = FXMLLoader.load(SplashScreenUi.class.getResource("SplashScreenUi.fxml"));
                for (Node node : root.getChildren()) {
                    if (node instanceof ProgressBar) {
                        progressBar = (ProgressBar) node;
                        progressBar.setProgress(-1);
                    }
                }
      
                Scene scene = new Scene(root);
                scene.setFill(Color.TRANSPARENT);
      
                return scene;
            } catch (Throwable e) {
                e.printStackTrace();
            }
            return null;
        }

With stage.initStyle(StageStyle.TRANSPARENT); I see that the preloader is opened (I see the icon in the taskbar) but I see nothing else (nor image, not progress bar, no stage).
It is opened ONLY when the Main application is shown.

Instead if I use stage.initStyle(StageStyle.UNDECORATED); all works as expected and the splash screen is shown BEFORE the Main application is displayed.