Kollider is a 2D static-collision library written in Java.
An utility app to create a MultiPolygon by overlaying it on a sprite is intended.
SVN: http://code.google.com/p/kollider2d/source/browse and http://code.google.com/p/kollider2d/source/checkout
Forum (Slick2D forum):
Demo apps are using Slick2D, a great 2D game library based on LWJGL created by Kev Glass.