DougBreaux 0100002GMN Visits (2484)
An oldie, but still useful from time to time.
Ever wonder which Jar or directory contains a class you're using in your JEE Web Application? Or which of multiple provider Jar files is the one being used? Or even whether or not a particular class is found at all?
No need to actually include it in your Web App permanently, but easy to deploy manually if you ever need it.