addWindowListener(new WindowAdapter() {

        @Override
        public void windowOpened(WindowEvent e) {
            try {
                controller.importFileOnLoad();
            } catch (ClassNotFoundException | IOException e1) {
                e1.printStackTrace();
            }
        }

tablePanel.getList(Controller.getList());

private List<Auto> list = Controller.getList();
            private JTree server;



            server = new JTree(createTree());
            add(new JScrollPane(server), BorderLayout.CENTER);

            private DefaultMutableTreeNode createTree() {
       DefaultMutableTreeNode top = newDefaultMutableTreeNode("Servers");
            findChld(top);
            return top;

             }


            private void findChld(DefaultMutableTreeNode parent) {
           for (int i = 0; i < list.size(); i++) {
           DefaultMutableTreeNode child = new
              DefaultMutableTreeNode(list.get(i).toString());
        parent.add(child);

         }
        }

public void ImportFile(File file) throws IOException,
   ClassNotFoundException {
    db.ImportFile(file);
     }

private List<Auto> AutoList;

public void importFileOnLoad() throws FileNotFoundException,
    IOException, ClassNotFoundException {
    File file = new File("C:\Users\Jovan\Desktop\ExitFile.auto");
    if(file.exists()) {


    ObjectInputStream inputStream = new ObjectInputStream(new BufferedInputStream(new FileInputStream(file)));

    AutoList.clear();

    Auto[] auto = (Auto[]) inputStream.readObject();

    AutoList.addAll(Arrays.asList(auto));

    inputStream.close();

    }
  }