Just saw this, but please note that Processing is not being run on the Arduino, but rather it is controlling the Arduino through the serial connection. And you

Just saw this, but please note that Processing is not being run on the Arduino, but rather it is controlling the Arduino through the serial connection. And you can control an Arduino via a serial connection using just about any programming language, including Python and JavaScript. So again, you can't run Java or Processing on the Arduino. Keep researching.