JavaFX launch another application

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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());
       }
    });
}

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