}
private boolean validateIssuer(SAMLSSOAuthnReqDTO authReqDTO) throws IdentityException {
try {
SSOServiceProviderConfigManager spConfigManager = SSOServiceProviderConfigManager.getInstance();
SAMLSSOServiceProviderDO spDO = spConfigManager.getServiceProvider(authReqDTO.getIssuer());
if (spDO == null) {
IdentityPersistenceManager persistenceManager = IdentityPersistenceManager.getPersistanceManager();
spDO = persistenceManager.getServiceProvider(
AnonymousSessionUtil.getSystemRegistryByUserName(SAMLSSOUtil.getRegistryService(),
SAMLSSOUtil.getRealmService(), authReqDTO.getUsername()), authReqDTO.getIssuer());