Even when the error happens on the server and you're not inside an IDE, most of them (I'm sure Netbeans does it) allow you to paste the stacktrace from the production logs and makes classes/lines clickable, so you can enter the source code at the right points.

It's more or less what your tool does on the web.

Your tool may still be useful if some arcane third party app crashes, but how would you track the proper source code without info on dependencies' versions?