Accelerator for Button in JavaFX

Question

I have an app in JavaFX with .FXML file and i add a button to the scene. Then i tried to add accelerator to it but when it launches it throws NullPointerException. Why it doesn't work and how to solve this.

  @FXML
    Button addQuickNote;

    @FXML
    public void handlequickNote(ActionEvent e) {
        String text = SampleController.getSelectedText();
        if (text != null) {
            SampleController.profileManager.insertNote(DataParser.getNote(text));
        }
    }

    @Override
    public void initialize(URL url, ResourceBundle rb) {
        addQuickNote.getScene().getAccelerators().put(new KeyCodeCombination(KeyCode.Q, KeyCombination.SHORTCUT_DOWN), new Runnable() {

            @Override
            public void run() {
                addQuickNote.fire();
            }
        });
    }

My .fxml is pretty complicated because it contains whole module for my app so i paste only a line with the button. The button is placed in the ToolBar.

<Button fx:id="addQuickNote" mnemonicParsing="false" onAction="#handlequickNote" prefWidth="77.0" text="Z tekstu" />

I'm loading .fxml as a part of main scene. I'm doing this by this code.

try {
    panel = FXMLLoader.load(getClass().getResource("Notes.fxml"));
} catch (IOException ex) {
    showErrorDialog ....;
}
rightPanel.getChildren().add(panel);
mainPanel.setRight(rightPanel);

Answer 1

As user714965 mentionend your Scene was not constructed fully yet and therefor addQuickNote.getScene() is null. Another solution might be something like this:

@Override
public void initialize(URL url, ResourceBundle rb) {
    Platform.runLater(() -> {        
        addQuickNote.getScene().getAccelerators().put(new KeyCodeCombination(KeyCode.Q, KeyCombination.SHORTCUT_DOWN), () -> {
            addQuickNote.fire();
        });
    });
}