JavaFX launch another application

I've been smashing my head with JavaFx...

This works for when there's no instances of an application running:

public class Runner {

    public static void main(String[] args) {
        anotherApp app = new anotherApp();
        new Thread(app).start();
    }
 }

public class anotherApp extends Application implements Runnable {

    @Override
    public void start(Stage stage) {
    }

    @Override
    public void run(){
        launch();
    }
}

But if I do new Thread(app).start() within another application I get an exception stating that I can't do two launches.

Also my method is called by an observer on the other application like this:

@Override
public void update(Observable o, Object arg) {
    // new anotherApp().start(new Stage());
            /* Not on FX application thread; exception */

    // new Thread(new anotherApp()).start();
            /* java.lang.IllegalStateException: Application launch must not be called more than once */
}

It's within a JavaFX class such as this:

public class Runner extends Applications implements Observer {

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

    @Override
    public void start(Stage stage){
    //...code...//
    }
    //...methods..//
    //...methods..//

    @Override
    public void update(Observable o, Object arg) {
    //the code posted above//
    }
}

I tried using ObjectProperties with listeners but it didn't work. I need to get this new stage running from within the update method from java.util.observer in some way.

Any suggestions are welcomed. Thanks.

Application is not just a window -- it's a Process. Thus only one Application#launch() is allowed per VM.

If you want to have a new window -- create a Stage.

If you really want to reuse anotherApp class, just wrap it in Platform.runLater()

@Override
public void update(Observable o, Object arg) {
    Platform.runLater(new Runnable() {
       public void run() {             
           new anotherApp().start(new Stage());
       }
    });
}

I did a constructor of another JFX class in Main class AnotherClass ac = new AnotherClass(); and then called the method ac.start(new Stage);. it worked me fine. U can put it either in main() or in another method. It does probably the same thing the launch(args) method does