Sorry to post here, but need to start somewhere :D ....
I have start using the Java wrapper lib https://github.com/mjeanroy/exiftool#readme
The lib works just fine, especially the stay open function is excellent for performance when you need to make many calls in a row...
It would have been interesting to be able to discuss improvements (eg being able to output json) as well as discussing how to submit ExifToolOptions....
(see the project was updated 8 months ago after a number of years without updates, i think the need for such libraries like this is needed...)
Hmm, can i move this to Developers... wrongly posted in API... sorry....
I would first try to open a github issue in that project to see if you got a response.
- Phil
Thank You Phil for moving this post, the ExifTool wrapper lib actually works real fine, so fine that it should need some more love :D