Jbox2d isn't involved with drawing at all; instead, it exposes a bunch of Bodies, having one or more Shapes, which is either a) a collection of points, or b) a circle. To draw them, you'll have to manually iterate over the bodies, get the shapes for each body, and then do calls to ellipse() or beginShape()...vertex()...endShape(). You'll probably want to look at the matrix stack as well, since the Shape's vertices are stored relative to the Body's "origin". Let me know if you need some explanation about that.

thank you so much,

An advice: when searching for a topic, use the search from the Processing.org site, not from this forum: it will be more focused than a generic Google search: it searches only this site, but it searches the whole site, including the wiki and the old forum which has lot of still relevant threads (and this forum, of course).
Doing so, you will find a tutorial I wrote (but never finished and I never reached the topic of custom drawing) and a topic right on spot for you.

thanks for the tip, i was searching for tutorials, and had found limited material on this library. I am very appreciative of both your tutorial and your search advice I had been using the google search.