Hi, Iv been wrestling with this library for some hours now.

From this post I can see that v2.2.2 seemed to work so I copied the example provided there.

Here it is for quick reference

2. 
   
3. import twitter4j.conf.*;
4. import twitter4j.internal.async.*;
5. import twitter4j.internal.org.json.*;
6. import twitter4j.internal.logging.*;
7. import twitter4j.json.*;
8. import twitter4j.internal.util.*;
9. import twitter4j.management.*;
10. import twitter4j.auth.*;
11. import twitter4j.api.*;
12. import twitter4j.util.*;
13. import twitter4j.internal.http.*;
14. import twitter4j.*;
15. import twitter4j.internal.json.*;
16. 
    
17. String ConsumerKey = "*************************************************************";
18. String ConsumerSecret = "*************************************************************";
19. String oauth_token = "**********************************************************************";
20. String oauth_token_secret = "*************************************************************";
21. 
    
22. String msg = "Test post via P55 T4J";
23. boolean sent;
24. 
    
25. TwitterFactory tf;
26. 
    
27. void setup() {
28.   size(200,200);
29.   background(255);
30.   sent = false;
31. 
    
32.   ConfigurationBuilder cb = new ConfigurationBuilder();
33.   cb.setDebugEnabled(true)
34.     .setOAuthConsumerKey(ConsumerKey)
35.     .setOAuthConsumerSecret(ConsumerSecret)
36.     .setOAuthAccessToken(oauth_token)
37.     .setOAuthAccessTokenSecret(oauth_token_secret);
38.   tf = new TwitterFactory(cb.build());
39. }
40. 
    
41. void draw() {
42.   if(sent) background(100);
43. }
44. 
    
45. void mousePressed() {
46.   Twitter twitter = tf.getInstance();
47.   try {
48.     Status st = twitter.updateStatus(msg + " " + getDateTime());
49.     println("Successfully updated the status to [" + st.getText() + "].");
50.     sent = true;
51.   }
52.   catch (TwitterException e) {
53.     println(e.getStatusCode());
54.   }
55. }
56. 
    
57. 
    
58. String getDateTime() {
59.   DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
60.   Date date = new Date();
61.   return dateFormat.format(date);
62. }

When I run the sketch an click on the mouse I get this error

java.lang.NoClassDefFoundError: com/google/appengine/api/urlfetch/HTTPRequest

I found in this forum that a possible solution is to remove twitter4j-appengine-2.2.4.jar from the library, so I did. The original erros is gone now and instead I get a 401 on the console. 

From what I read here the error stems from an authentication error.

Any ideas?

Thank you