javafx image button

public class EffectTest extends Application {
  public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage stage) {
        Scene scene = new Scene(new Group());
        stage.setTitle("Button Sample");
        stage.setWidth(300);
        stage.setHeight(190);

        VBox vbox = new VBox();
        vbox.setLayoutX(20);
        vbox.setLayoutY(20);

        Image image = new Image(getClass().getResourceAsStream("/effecttest/img/1156909.png"));
        Button button1 = new Button("Accept");
        button1.setGraphic(new ImageView(image));
        button1.setOnAction(new EventHandler<ActionEvent>() {
            @Override public void handle(ActionEvent e) {
                System.out.println("Accepted");
            }
        });

        vbox.getChildren().add(button1);
        vbox.setSpacing(10);
        ((Group)scene.getRoot()).getChildren().add(vbox);

        stage.setScene(scene);
        stage.show();
    }
}