I am trying to use Yahoo Mail Web Services API but I am getting an error when trying to authenticate using OAth.
I am using signpost API to authenticate.

This is the code I have:

CODE

public class Main {

      public static void main(String[] args) throws Exception {

        OAuthConsumer consumer = new CommonsHttpOAuthConsumer("dj0yJmk9Uk5TVVBRZUdxN2VLJmQ9WVdrOVkyZGpZWEJPTm04bWNHbzlOVGsxT0RVeE16azAmc=1j
b25zdW1lcnNlY3JldCZ4PTdk",
                "e9b7fadccda0ff23e0d7c76accbd509a7688f955", SignatureMethod.HMAC_SHA1);

        OAuthProvider provider = new DefaultOAuthProvider(consumer,
                "https://api.login.yahoo.com/oauth/v2/get_request_token",
                "https://api.login.yahoo.com/oauth/v2/get_token",
                "https://api.login.yahoo.com/oauth/v2/request_auth");

        System.out.println("Fetching request token from Yahoo...");

        // we do not support callbacks, thus pass OOB
        String authUrl = provider.retrieveRequestToken(OAuth.OUT_OF_BAND);

        System.out.println("Request token: " + consumer.getToken());
        System.out.println("Token secret: " + consumer.getTokenSecret());

        System.out.println("Now visit:\n" + authUrl
                + "\n... and grant this app authorization");
        System.out.println("Enter the verification code and hit ENTER when you're done");

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String code = br.readLine();

        System.out.println("Fetching access token from Fire Eagle...");

        provider.retrieveAccessToken(code);

        System.out.println("Access token: " + consumer.getToken());
        System.out.println("Token secret: " + consumer.getTokenSecret());

        HttpPost request = new HttpPost(
                "https://fireeagle.yahooapis.com/api/0.1/update");
        StringEntity body = new StringEntity("city=hamburg&label="
                + URLEncoder.encode("Send via Signpost!", "UTF-8"));
        body.setContentType("application/x-www-form-urlencoded");
        request.setEntity(body);

        consumer.sign(request);

        System.out.println("Sending update request to Fire Eagle...");

        HttpClient httpClient = new DefaultHttpClient();
        HttpResponse response = httpClient.execute(request);

        System.out.println("Response: "
                + response.getStatusLine().getStatusCode() + " "
                + response.getStatusLine().getReasonPhrase());
    }

}

But I get an error when I try to execute that:

Fetching request token from Yahoo...
Exception in thread "main" oauth.signpost.exception.OAuthNotAuthorizedException: Authorization failed (server replied with a 401). This can happen if the consumer key was not correct or the signatures did not match.
at oauth.signpost.basic.DefaultOAuthProvider.retrieveToken(DefaultOAuthProvider.jav
a:126)
at oauth.signpost.basic.DefaultOAuthProvider.retrieveRequestToken(DefaultOAuthProvi
der.java:66)
at Main.main(Main.java:46)
Java Result: 1

Anyone can help me getting this code to run?
Regards