Block owner window Java FX

Thanks, optimal solution: example with FXML load file:

@Override
    public void start(Stage primaryStage) throws IOException {
        Parent root = FXMLLoader.load(getClass().getResource("DialogView.fxml"));
        primaryStage.initModality(Modality.APPLICATION_MODAL); // 1 Add one
        Scene scene = new Scene(root);        
        primaryStage.setScene(scene);
        primaryStage.initOwner(primaryStage.getScene().getWindow());// 2 Add two
        primaryStage.show();

    }

    public static void main(String[] args) {
        launch(args);

    }

Use a Stage instead of a Popup.

Before showing the stage, invoke stage.initModality as either APPLICATION_MODAL or WINDOW_MODAL, as appropriate. Also invoke stage.initOwner to the parent window of your new stage so that it will appropriately block it for the WINDOW_MODAL case.

Stage stage = new Stage();
stage.initModality(Modality.WINDOW_MODAL);
stage.initOwner(pane.getScene().getWindow());
stage.setScene(new Scene(content));
stage.show();