import javafx.application.Application;
import javafx.stage.Stage;

static bool startJavaFX_firstStart = true;

static void startJavaFX(final Class<? extends Application> appClass) {
  thread "Starting JavaFX" {
    if (startJavaFX_firstStart) {
      startJavaFX_firstStart = false;
      fixContextClassLoader(); // Maybe not needed anymore now
      Application.launch(appClass);
    } else jfxLater(r {
      Application app = nuObject(appClass);
      new Stage stage;
      app.start(stage);
    });
  }
}