vaadin/web-components

public class MainView extends VerticalLayout {
    private CustomerService service ;
    public Customer customer = new Customer();
    private Binder<Customer> binder = new Binder<>(Customer.class);

    private Grid<Customer> grid = new Grid(Customer.class);
    private  Button save = new Button("Save", e -> {
        try {
            binder.writeBean(customer);
            saveCustomer();
            updateGrid();
            binder.readBean(new Customer());
        } catch (ValidationException ex) {
            ex.printStackTrace();
        }
    });

    public MainView(CustomerService service) {
        this.service = service;

        add(
                new H1("הוסף לקוח"),
               buildForm(),
               grid
       );
       updateGrid(); // update the grid with the sql data

        setSizeFull();


    }
    private void saveCustomer() throws ValidationException {

        service.update(customer);

    }
    private Component buildForm() {
        TextField firstName = new TextField("First Name");
         TextField lastName = new TextField("Last Name");

       TextField id = new TextField("ID");
         TextField  company= new TextField("Company");
         TextField address = new TextField("Address");
         TextField phone = new TextField("phone");
        TextField created = new TextField("created");
         TextField email = new TextField("Email");
        Div errorsLayout = new Div();

binder.forField(firstName)
        .bind(
                Customer::getFirstName,Customer::setFirstName
        );
        binder.forField(lastName)
                .bind(
                        Customer::getLastName,Customer::setLastName
                );



        Button reload = new Button("reload", e ->{
            try{
                binder.readBean(customer);

            } catch (Exception ex) {
                ex.printStackTrace();
            }
        });
        // Configure UI components
        save.setThemeName("primary");
        // Wrap components in layouts
        HorizontalLayout formLayout = new HorizontalLayout(grid,firstName,lastName,save,reload);
        Div wrapperLayout = new Div(formLayout, errorsLayout);
        formLayout.setDefaultVerticalComponentAlignment(Alignment.BASELINE);
        wrapperLayout.setWidth("100%");

        grid.setColumnReorderingAllowed(true);


        return wrapperLayout;

    }


    private void updateGrid() {

        List<Customer> customers = service.findAll();
        grid.setItems(customers);



    }

    public List<Customer> findAll() {
        return jdbcTemplate.query(
                "SELECT ID, FirstName, LastName FROM customer",
            (rs, rowNum) -> new Customer(rs.getLong("ID"),
                        rs.getString("FirstName"), rs.getString("LastName")));
}