A collection of basic examples and/or Processing library to make using JBox2D (http://www.jbox2d.org/) easier for the beginner.

Download library: http://www.shiffman.net/p5/libraries/pbox2d/pbox2d.zip

(The tutorial below is out of date as the library now works with JBox2D 2.1.2. Stay tuned.)

Full tutorial and examples available here: 
http://www.shiffman.net/teaching/nature/box2d-processing/