@Override
    public void setCookieDomain(final String cookieDomain) {
        super.setCookieDomain(StringUtils.defaultIfEmpty(cookieDomain, null));
    }
Is remember me authentication ?

@param requestContext the request context
@return true/false
core/cas-server-core-cookie-api/src/main/java/org/apereo/cas/web/support/gen/CookieRetrievingCookieGenerator.java