Unable to monitor user by filter()

[DavideXX92]

I need to monitor all the new tweets of a user, however I'm not able to retrieve any tweets :(
Are there any mistakes in my code?

@RequestMapping("twitter/notify")
public String twitterNotify(){
    Twitter twitter = new TwitterTemplate(consumerKey, consumerSecret, accessToken, accessTokenSecret);

    StreamListener listener = new StreamListener() {        
        @Override
        public void onWarning(StreamWarningEvent warningEvent) {
            // TODO Auto-generated method stub
            System.out.println("onWarning");                
        }

        @Override
        public void onTweet(Tweet tweet) {
            // TODO Auto-generated method stub
            System.out.println("Tweet: " + tweet.getFromUser() + " -> " + tweet.getText());
        }

        @Override
        public void onLimit(int numberOfLimitedTweets) {
            // TODO Auto-generated method stub
            System.out.println("onLimit");
        }

        @Override
        public void onDelete(StreamDeleteEvent deleteEvent) {
            // TODO Auto-generated method stub
            System.out.println("onDelete");
        }
    };  
    FilterStreamParameters filterparams = new FilterStreamParameters();
    long myId = twitter.userOperations().getUserProfile("DavideXX92").getId();
    filterparams.follow(myId);
    twitter.streamingOperations().filter(filterparams, Arrays.asList(listener));

    return "request done";
}