return authenticator;
        } catch (final Exception e) {
            throw new SsoLoginException("Failed to initialize SPNEGO.", e);
        }
    }

    /* (non-Javadoc)
     * @see org.codelibs.fess.sso.spnego.SsoAuthenticator#getLoginCredential()
     */
    @Override
    public LoginCredential getLoginCredential() {
        return LaRequestUtil.getOptionalRequest().map(request -> {