How to pass parameters to JavaFX application?

Question

I am running my JavaFX application like this:

public class MainEntry {
    public static void main(String[] args) {
        Controller controller = new Controller();
        Application.launch(MainStage.class);
    }
}

MainStage class extends Appication. Application.launch starts my JavaFX window in a special FX-thread, but in my main method I don't even have an instance of my MainStage class.

How to pass non-String parameter (controller in my case) to MainStage instance? Is it a flawed design?

Answer 1

Starting with JavaFX 9 you can trigger the launch of the JavaFX platform "manually" using the public API. The only drawback is that the stop method is not invoked the way it would be in application started via Application.launch:

public class MainEntry {
    public static void main(String[] args) {
        Controller controller = new Controller();

        final MainStage mainStage = new MainStage(controller);
        mainStage.init();

        Platform.startup(() -> {
            // create primary stage
            Stage stage = new Stage();

            mainStage.start(stage);
        });
    }
}

The Runnable passed to Platform.startup is invoked on the JavaFX application thread.