Is twitter4j now integrated into Processing (3.5.4)? I’m using it without problems and its not in the code folder of the sketch.
I don’t think so. To use a library, you can either add the lib to the sketch folder or add it to the libraries folder inside Processing folder in Documents or something… and perhaps the latter is the case. You can also check from Sketch menu → import library to see if twitter4j is listed (installed).
Silly me Twitter4j is bundled as part of Simpletweet, it’s not listed separately in the Contribution Manager or integrated into Processing core.