java.lang.NullPointerException at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1129)

[Peter Penzov]

Hi,
  I'm working on JavaFX example which uses Toggle button:

private void initMainStage(final Stage mainStage)
    {
        // Set Main Window Label

        // Set Icon of the main stage
        Image img = new
Image(getClass().getResource("/com/dx57dc/images/internet-icon.png").toExternalForm());

        mainStage.getIcons().add(img);

        // Main Stage
        root = new BorderPane();
        final VBox vbox = new VBox();
        // Set Style
        String pillButtonCss =
DX57DC.class.getResource("/com/dx57dc/css/PillButton.css").toExternalForm();


        // Create 3 toggle buttons and a toogle group for them
        ToggleButton tb1 = new ToggleButton("Infrastructure");
        tb1.setId("pill-left");
        ToggleButton tb2 = new ToggleButton("Agents");
        tb2.setId("pill-center");
        ToggleButton tb3 = new ToggleButton("Live Performance");
        tb3.setId("pill-right");

        final ToggleGroup group = new ToggleGroup();
        tb1.setToggleGroup(group);
        tb2.setToggleGroup(group);
        tb3.setToggleGroup(group);
        // Select the first button by default
        group.selectToggle(tb1);

        // Some test data
        final Rectangle rect2 = new Rectangle(300, 300);
        rect2.setFill(Color.SILVER);
        final Rectangle rect3 = new Rectangle(300, 300);
        rect3.setFill(Color.DODGERBLUE);

        tb1.setUserData(root);
        tb2.setUserData(rect2);
        tb3.setUserData(rect3);
        final HBox hBox = new HBox();

        // Listener which changes toggle buttons content
        group.selectedToggleProperty().addListener(new
ChangeListener<Toggle>()
        {
            @Override
            public void changed(ObservableValue<? extends Toggle> ov,
Toggle toggle, Toggle new_toggle)
            {
                if (new_toggle == null)
                {
                }
                else
                {
                    vbox.getChildren().set(2, (Node)
group.getSelectedToggle().getUserData());
                }
            }
        });

        hBox.getChildren().addAll(tb1, tb2, tb3);
        hBox.setPadding(new Insets(5, 5, 5, 5)); // Padding between the
main menu and the content
        hBox.getStylesheets().add(pillButtonCss); // Add the css style

        // Content of the main stage
        leftHBox = getLeftHBox(mainStage, root);
        rightHBox = getRightHBox(mainStage);
        footerVBox = getFooter(mainStage);
        centerPane = getCenterPane(mainStage);

        // default resizer with drag insets(5,5,5,5);
        //RegionResizerFX.register(leftHBox, rightHBox, footerVBox,
centerPane);

        root.setRight(rightHBox);
        root.setBottom(footerVBox);
        root.setLeft(leftHBox);
        root.setCenter(centerPane);

        RegionResizerFX.register(centerPane);

        // Vbox which holds main menu, toggle buttons and main content
        vbox.getChildren().addAll(getMenu(mainStage, root), hBox, (Node)
group.getSelectedToggle().getUserData());

        // Set main stage size and color
        Scene scene = new Scene(vbox, 1200, 650, Color.WHITESMOKE); // Set
main Stage color

        // Application Close Confirmation Dialog
        dialog = new DialogPanels();
        dialog.initClosemainAppDialog(mainStage);

        // Application Hot Keys Utilization
        hotkey = new HotKey();
        hotkey.initApplicationHotKeys(mainStage, scene);

        mainStage.setScene(scene);

        Rectangle2D primaryScreenBounds =
Screen.getPrimary().getVisualBounds();

        // Set Stage boundaries to visible bounds of the main screen
        mainStage.setX(primaryScreenBounds.getMinX());
        mainStage.setY(primaryScreenBounds.getMinY());
        mainStage.setWidth(primaryScreenBounds.getWidth()); // Maximum
width of the display
        mainStage.setHeight(primaryScreenBounds.getHeight()); // Maximum
height of the display
        //mainStage.show();

    }


I tried to run the code on JVM 8b99 but I get error which I described here:

https://javafx-jira.kenai.com/browse/RT-31859

Is this JVM bug or I have a bug into my code?