Not sure why I never posted earlier, up until now I'd just been using a modified build file.
After running "ant jsmooth" it makes me a nice and shiny KoLmafia#.exe.
But attempting to run again fails... the jsmooth file has been deleted.
So I'd have to go fetch it from the garbage to run again.
I circumvented this by adding a few copy lines to build, but I'm wondering if there's something else at hand or maybe just some other way to go about it.
Here are the changes I made to make it work for me.