@FXMLController(value = "LoginView.fxml")
public class JavaFXLoginView implements LoginView {

    private LoginPresenter presenter;

    @FXML
    private PasswordField password;
    @FXML
    private TextField username;
    @FXML
    private Label errorLabel;
    @FXML
    private Button loginButton;

    public JavaFXLoginView() {

    }

    @FXML
    public void login(ActionEvent event) {
        String thePassword = password.getText();
        String theUsername = username.getText();
        System.out.println(this.presenter); // Null
        this.presenter.loginButtonClicked(theUsername, thePassword);
    }

    @Override
    public void setErrorMessage(String errorMessage) {
        errorLabel.setText(errorMessage);

    }

    @Override
    public void setNotificationMessage(String message) {
        // TODO Auto-generated method stub

    }

    @Override
    public void setPresenter(LoginPresenter presenter) {
        System.out.println("SET PRESENTER CALLED");
        System.out.println(presenter); // notNull
        this.presenter = presenter;

    }

}

@Override
public void start(Stage stage) throws Exception {
    Parent root = ViewLoader.getFXML("LoginView");

    Scene scene = new Scene(root);

    LoginService loginService = new LoginServiceImpl();

    JavaFXLoginView loginView = new JavaFXLoginView();

    FXLoginNavigator navigator = new FXLoginNavigator(stage);

    LoginPresenter loginPresenter = new LoginPresenter(loginView, loginService, navigator);
    loginView.setPresenter(loginPresenter);

    stage.setScene(scene);
    stage.show();

}

public static void startUp(String[] args) {
    launch(args); // called main method somewhere else
}