A command-line executable Jar tool to find in which Jar mentioned in the search path, the searched-for class exists.
Written by Tom Ball, and originally mentioned in this post:
Maven build script and build by WizTools.org.
$ java -jar jfind-1.0.jar fully.qualified.ClassName \ /path/to/search/1 /path/to/search/2 ...
This tool is available as part of "The Joy of Unix in Windows Tool Bundle":