OAuth2Accessor accessor = null;
try {
final OAuth2Message msg = this.oauth2MessageProvider.get();
msg.parseRequest(request);
final OAuth2Error error = msg.getError();
final String encRequestStateKey = msg.getState();
if (encRequestStateKey == null) {
if (error != null) {
OAuth2CallbackServlet.sendError(error, "encRequestStateKey is null", msg.getErrorDescription(),
msg.getErrorUri(), null, resp, null, this.sendTraceToClient);