if (issResp == null) {
logger.error("Null issuer response returned from service.");
throw new AuthenticationServiceException("No issuer found.");
}
if (issResp.shouldRedirect()) {
response.sendRedirect(issResp.getRedirectUrl());
} else {
String issuer = issResp.getIssuer();
if (!Strings.isNullOrEmpty(issResp.getTargetLinkUri())) {