I have compiled a program (no errors, no warnings) but as i
try to run it i get a run-time error - NoClassDefFoundError.
I was surprised as i thouth it would occur during the
process of compiling...

I've written some really ugly code for a game. Basically the game-field
consists of a couple of com.sun.j3d.utils.geometry.Box-objects that are
clicked by the user. Now I figured out how to pick a box, but fail to
change the box's color after it was created.