I’ve been using the Twitter4j library to successfully authenticate with twitter for months. Recently (in past few days) it has stopped working.
The request token is returning null values.
requestToken = twitter.getOAuthRequestToken(callbackURL);
log.info("Request token: " + requestToken.getToken());
log.info("Request token secret: " + requestToken.getTokenSecret());
This only happens on Appengine, and still works fine on my local machine.