ProgressIndicator finishes when I start another Stage - javafx

Question

I want to create an application starter. The ProgressIndicator should running during start of the new Stage in new Thread. But if I click at the start button the ProgressIndicator stops running.
It works if I make some I/O and ProgressIndicator shows progress. It is apparently not possible to update two stages in JavaFX in parallel or does anyone have a solution for me?
public class Main extends Application {
public void start(Stage primaryStage) {
primaryStage.setScene(new Scene(new UserVC().getView(), 600, 200));
primaryStage.show();
userVC.autologin();
}
public static void main(String[] args) { launch(args); }
}
public class UserView extends BorderPane {
private ProgressIndicator progressIndicator = new ProgressIndicator();
public UserView() {
super.setCenter(createContent());
}
public Node createContent() {
HBox userbox = new HBox();
userbox.getChildren().add(progressIndicator);
progressIndicator.show();
return userbox;
}
}
public class UserVC {
private UserView view = new UserView();
public UserVC() {
}
public void autologin() {
Task<Void> task = new Task<Void>() {
#Override public Void call() throws InterruptedException {
try {
Thread.sleep(1000);
Platform.runLater(new Runnable() {
#Override public void run() {
Stage stage = new Stage();
stage.setScene(new Scene(new MainControlVC().getView(), 900, 300));
stage.show();
}
});
}
catch(Exception e) {
e.printStackTrace();
}
return null;
}
};
view.getProgressIndicator().progressProperty().unbind();
view.getProgressIndicator().progressProperty().bind(task.progressProperty());
new Thread(task).start();
}
}

Answer 1

I changed the Task to Thread and it works fine now:
Thread thread = new Thread() {
public void run() {
mainController = new MainControlVC(dataDirectory, user);
Platform.runLater(new Runnable() {
#Override public void run() {
Stage stage = new Stage();
Scene scene = new Scene(mainController.getView(), mainController.getWidth(), mainController.getHeight());
stage.setScene(scene);
stage.show();
}
});
}
};
thread.start();