The org.clapper.util Java Utility Library is a library of miscellaneous utility classes and methods. As a general-purpose set of tools, this API is a conceptual extension of the JDK. I use this library myself, so I frequently update and revise its contents.
The library is Copyright © 2004-2010, Brian M. Clapper, is released under a BSD License.
Please see the home page for more information, downloads, and the like.