In this specific case, the app was targeted for MacOS and OS X earlier. Java really isn't a good solve on that platform. Which also makes it not a good solve for anything on the Mac platform.
I have been wanting to build a UI tool for non-techies to be a front end to a collection of shell scripts that I have been using for day-to-day tasks. I have written the scripts to be a friendly as I can make them with drag-n-drop folders as inputs rather than requiring arguments to be provided. This looks like a good example for me to use as research.