Cancel javafx stage exit request

public void start(Stage stage) throws Exception {
    FXMLLoader ldr = new FXMLLoader(getClass()
                .getResource("Application.fxml"));
    Parent root = (Parent) ldr.load();
    appCtrl = (ApplicationController) ldr.getController();

    Scene scene = new Scene(root);

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

    scene.getWindow().setOnCloseRequest(new EventHandler<WindowEvent>() {
        public void handle(WindowEvent ev) {
            if (!appCtrl.shutdown()) {
                ev.consume();
            }
        }
    });
}

Source: stackoverflow.com

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