Handling authentication error exceptions
If the deserializeAsModel() method detects an error while deserializing the model, it throws an AuthnErrorException. If the added validation checks in validateSubmittedAttributes detect an error, they also throw this exception.
The adapter should catch this exception and send an API error response using the method AuthnApiSupport.writeErrorResponse().
try
{
...
}
catch (AuthnErrorException e)
{
// A validation error occurred while processing an API request, return an error response to the API client
apiSupport.writeErrorResponse(req, resp, e.getValidationError());
authnAdapterResponse.setAuthnStatus(AUTHN_STATUS.IN_PROGRESS);
return authnAdapterResponse;
}