Hi Guillaume,

Thanks for picking this up and submitting a patch.

Have you considered using `tramp-handle-file-exists-p'? I’m not overly familiar
with tramp or this sort of issue, but it looks like it could be exactly what we want.

> My Emacs Workflow involves connecting to a dev server over SSH so I can use my
> machines as thin clients and avoid synchronizing files, for that I do pretty
> much everything over TRAMP as I don’t want to lose the benefits of GUI Emacs.
> While everything mostly works impressively fine, I noticed writing my
> specifications that ob-plantuml fails to generate diagrams.
>
> It seems to me that there is a redundant check which uses `file-exists-p` even
> if using TRAMP, the plantuml jar is located on the remote server, so it fails
> with an error even though the command to actually render the diagrams works
> fine.

All the best,
Timothy