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till processing 3 i have often made that successfully. Yesterday, answering to some question that you can see here forum.processing.org/two/discussion/12624/can-i-launch-an-instance-of-processing-inside-of-a-control-on-a-sketch#latest i posted the code you can see at the same url. This code works, i have used it many times and tested the snippet i put. Yet theOP said me "this code does not work, it fires that the applet.init() method does not exist" and he added that he was using processing 3. So, i went to the docs / changes && found that:
"As of Processing 3.0, we have removed Applet as the base class for PApplet. This means that we can remove lots of legacy code, however one downside is that it's no longer possible (without extra code) to embed a PApplet into another Java application"
ok. But i would be very happy to understand by an example what kind of "extra code" i could use... thanks in advance