@Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse index() {
        saveToken();
        return asIndexHtml();
    }

    private HtmlResponse asIndexHtml() {
        return asHtml(path_AdminMaintenance_AdminMaintenanceJsp).useForm(ActionForm.class, op -> op.setup(f -> {
            f.replaceAliases = Constants.ON;

        saveToken();
        return asIndexHtml();
    }

    private HtmlResponse asIndexHtml() {
        return asHtml(path_AdminUpgrade_AdminUpgradeJsp).useForm(UpgradeForm.class);
    }

    @Execute
    @Secured({ ROLE })
    public HtmlResponse upgradeFrom(final UpgradeForm form) {
        validate(form, messages -> {}, this::asIndexHtml);
        verifyToken(this::asIndexHtml);