Unable to use Java Signpost to properly OAuth (with Discogs)

Question

I'm trying to use Java SignPost to get Oauth support from discogs

If I call this method it provides a url to a website, then if I login I get a verification code, so far so good.

    public static String requestDiscogsAuthorization() throws Exception
    {

        OAuthConsumer consumer = new DefaultOAuthConsumer(CONSUMER_KEY, CONSUMER_SECRET);
        OAuthProvider provider = new DefaultOAuthProvider(
                "http://api.discogs.com/oauth/request_token",
                "http://api.discogs.com/oauth/access_token",
                "http://www.discogs.com/oauth/authorize");
        provider.setRequestHeader("User-Agent", SongKong.USER_AGENT);
        return provider.retrieveRequestToken(consumer,  OAuth.OUT_OF_BAND);
    }

I store this verification code in my application and can retrieve as UserPreferences.getInstance().getDiscogsAuthorization(). So now I want to sign a url I try and call the getAccessToken() below to get an access code from my verification key but I get

oauth.signpost.exception.OAuthExpectationFailedException: Authorized request token or token secret not set. Did you retrieve an authorized request token before?
    at oauth.signpost.AbstractOAuthProvider.retrieveAccessToken(AbstractOAuthProvider.java:89)
    at com.jthink.songkong.analyse.toplevelanalyzer.DiscogsAuth.getAccessToken(DiscogsAuth.java:54)

I dont see what im doing wrong

 public class DiscogsAuth
{
    /**
     * Constructs a consumer with valid access token for signing urls (can only be used once user has authorizaed application and auth code
     * available to application somewhere
     *
     * NOTE:Not thread safe, has to be done once for each thread
     *
     * @return
     * @throws Exception
     */
    public static OAuthConsumer getAccessToken() throws Exception
    {
        OAuthConsumer consumer = new DefaultOAuthConsumer(CONSUMER_KEY, CONSUMER_SECRET);
        OAuthProvider provider = new DefaultOAuthProvider(
                "http://api.discogs.com/oauth/request_token",
                "http://api.discogs.com/oauth/access_token",
                "http://www.discogs.com/oauth/authorize");
        provider.setRequestHeader("User-Agent", SongKong.USER_AGENT);
        provider.retrieveAccessToken(consumer, UserPreferences.getInstance().getDiscogsAuthorization());
        return consumer;
    }

    /**
     * Sign Url Connection
     *
     * @param urlConnection
     * @param consumer
     * @throws Exception
     */
    public static void signUrl(HttpURLConnection urlConnection, OAuthConsumer consumer) throws Exception
    {
         consumer.sign(urlConnection);
    }
}

Answer 1

The problem was that I was not using the same instance of OAuthConsumer and OAuthProvider for every step.