Be sure to include in your data folder the mtl file as well textures. Also remember that images files paths should be relative to the data folder too.

If you are using processing-2.0b7 (which you probably should be) there is an example included with the download Shape/LoadDisplayOBJ of a rocket object 

Hi, 

Hi what ar library are you using? Nyartoolkit? Does it work for u on processing 2.0? The examples seem to come up with errors for me and I don't understand why the camera doesn't load properly, it works fine in processing 1.5 but not 2.0?

You can try Saito Object Loader library which is up at http://code.google.com/p/saitoobjloader/ I have used it with some of my work, https://github.com/hamzeen/P5LeapMotionExamples/tree/master/Leap3D & it used to work well. Hope it will help you.