final SsoAuthenticator authenticator = getAuthenticator();
            if (authenticator != null) {
                return authenticator.getLoginCredential();
            }
        }
        return null;
    }

    public ActionResponse getResponse(final SsoResponseType responseType) {
        if (available()) {
            final SsoAuthenticator authenticator = getAuthenticator();
            if (authenticator != null) {

        });
        final LoginCredentialResolver loginResolver = new LoginCredentialResolver(resolver);
        for (final SsoAuthenticator auth : ComponentUtil.getSsoManager().getAuthenticators()) {
            auth.resolveCredential(loginResolver);
        }
    }

    public static class LoginCredentialResolver {

            logger.debug("Initialize {}", this.getClass().getSimpleName());
        }
        ComponentUtil.getSsoManager().register(this);
    }

    protected synchronized org.codelibs.spnego.SpnegoAuthenticator getAuthenticator() {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        if (authenticator != null && fessConfig.getSystemPropertyAsBoolean(SPNEGO_INITIALIZED, false)) {
            return authenticator;
        }