Manipulação de objetos no JavaFX[dúvida]

--Projeto
     app
        |Aplicacao.java   //principal onde abro login, verifico um arquivo properties e inicio um systemtray
     controller
        |ArquivoController.java      //lê e grava as informações no properties
        |ConfiguracaoController.java
        |LoginController.java
        |Task.java       //utilizo este para iniciar o systemtray e criar uma tarefa agendada pelo TimerTask
     resources
        //imagens e css
     view
        |Login.fxml
        |Configuracao.fxml
     vo
        |VoPropriedades.java

public class Aplicacao extends Application {

    public static java.awt.TrayIcon trayIcon;
    
    public static java.awt.SystemTray tray;

    @Override
    public void start(Stage stage) throws Exception {
        
        File file = new File("C:\\Backup Online\\Conf.Properties");
        ArquivoController con = new ArquivoController();
        
        if(!file.exists())
            con.newFile();
        
        Parent root = FXMLLoader.load(getClass().getResource("/view/Login.fxml"));
            
        this.stage = stage;
        
        Platform.setImplicitExit(false);

        // sets up the tray icon (using awt code run on the swing thread).
        javax.swing.SwingUtilities.invokeLater(this::addAppToTray);
              
        addDragListeners(root, stage); 

        root.setStyle(
            "-fx-background-color: rgba(255, 255, 255, 0.5);" +
            "-fx-background-insets: 50;"
        );
        
        Scene scene = new Scene(root, 384, 257, Color.TRANSPARENT);
        scene.setFill(Color.TRANSPARENT);
        
        stage.setScene(scene);
        stage.setTitle("Login");
        stage.setResizable(false);
        stage.initStyle(StageStyle.TRANSPARENT);
        stage.show();
    }

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

    private void addAppToTray(){
        try {
            java.awt.Toolkit.getDefaultToolkit();

            if (!java.awt.SystemTray.isSupported()) {
                System.out.println("No system tray support, application exiting.");
                Platform.exit();
            }

            this.tray = java.awt.SystemTray.getSystemTray();
            
            java.awt.Image image = ImageIO.read(getClass().getClassLoader().getResourceAsStream("res/download.png"));
            this.trayIcon = new java.awt.TrayIcon(image,"Backup Online");

            this.trayIcon.addActionListener(event -> Platform.runLater(this::showStage));

            java.awt.MenuItem openItem = new java.awt.MenuItem("Abrir");
            openItem.addActionListener(event -> Platform.runLater(this::showStage));

            java.awt.Font defaultFont = java.awt.Font.decode(null);
            java.awt.Font boldFont = defaultFont.deriveFont(java.awt.Font.BOLD);
            openItem.setFont(boldFont);

            java.awt.MenuItem exitItem = new java.awt.MenuItem("Sair");
            exitItem.addActionListener(event -> {
                notificationTimer.cancel();
                Platform.exit();
                this.tray.remove(this.trayIcon);
            });

            // setup the popup menu for the application.
            final java.awt.PopupMenu popup = new java.awt.PopupMenu();
            popup.add(openItem);
            popup.addSeparator();
            popup.add(exitItem);
            this.trayIcon.setPopupMenu(popup);
            
            Task task = new Task();
            task.tarefa();
            
            // add the application tray icon to the system tray.
            //this.tray.add(this.trayIcon);
        } catch (IOException e) {
            System.out.println("Unable to init system tray");
            //e.printStackTrace();
        }
    }
}

@FXML
    public void cliqueBtnSalvar(ActionEvent event) throws FileNotFoundException {
        vo.setNomeempresa(tfEmpresa.getText());
        vo.setHora_backup(tfHora.getText());
        vo.setMinuto_backup(tfMinuto.getText());

        ArquivoController saveConfig = new ArquivoController();
        saveConfig.writeConfigBackup(vo);    // aqui vai ser gravada as informações novas como hora, minuto e empresa
        
        new Task();  // depois leio o properties para abrir um novo TimeTask
    }

import static app.Aplicacao.trayIcon;
import static app.Aplicacao.tray;

public class Task {   
    
    public void tarefa() throws FileNotFoundException{
        VoPropriedades vo = new ArquivoController().LoadProperties();
        
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, Integer.parseInt(vo.getHora_backup()));
        calendar.set(Calendar.MINUTE, Integer.parseInt(vo.getMinuto_backup()));
        calendar.set(Calendar.SECOND, 0);
        Date time = calendar.getTime();

        Timer timer = new Timer();
        timer.schedule(new TimerTask() {

            @Override
            public void run() {  //mais tarde ele vai invocar um método para acionar o envio de backup
                javax.swing.SwingUtilities.invokeLater(() ->
                        trayIcon.displayMessage(
                                        "Backup Online",
                                        "Efetuando backup " ,
                                        java.awt.TrayIcon.MessageType.INFO
                                )
                            );                          
            }
        }, time);
        
            try {
                tray.add(trayIcon);
            } catch (AWTException ex) {
                Logger.getLogger(Task.class.getName()).log(Level.SEVERE, null, ex);
            }
    }  
}