Difficulty configuring plantuml-mode despite scouring the README about plantuml-mode

[stig]

I think it would help us help you if you gave an example of an Org file you have, the output or error you get and the expected results. For what it's worth this works for me:

#+begin_src plantuml :file plantuml-demo.png
title Authentication Sequence

Alice->Bob: Authentication Request
note right of Bob: Bob thinks about it
Bob->Alice: Authentication Response
#+end_src

(The :file filename.png is very important.)

"Executing" that by positioning cursor anywhere in the source block and hitting C-c C-c asks me "Evaluate this plantuml code block on your system? (y or n)".

FWIW my PlantUML config (this week) is https://github.com/stig/dotfiles/blob/trunk/Emacs.org#plantuml
and my babel configuration is:

(org-babel-do-load-languages 'org-babel-load-languages
				 '((emacs-lisp . t)
				   (sql . t)
				   (shell . t)
				   (plantuml . t))))

[terlar]

As far as I known plantuml-mode is not used for org-mode except for the indentation and syntax highlighting if you have enabled that. All the Babel stuff comes from ob-plantuml bundled with org-mode.

[factotvm]

Thank you both for your help. With it, I now have my expected environment, which is I can write PlantUML both in a major mode and in Org mode, and it behaves identically to writing GraphViz: one is able to preview (in the former), and generate results (in the latter).

My path there was a little circuitous. I tried to follow @stig's config (that's fun to say), and after realizing (after @terlar's comment) that I am not to replace ob-plantuml with plantuml-mode, I started making progress. I got a bit stuck on trying to follow Stig's configuration in that ob-plantuml wouldn't load. Of course not, it doesn't exist as a package anymore (Terje told me that, I'm just slow).

So, I removed all configuration of ob-plantuml in my config, and set the (as of org-mode 9.4) org-plantuml-exec-mode to 'plantuml (which was really my goal all along—to use the executable configuration of plantuml-mode so that I didn't have to use the jar).

I do still have this issue (put here for completeness, but not related to plantuml-mode) the first time I try and to generate results in Org mode:

Code block produced no output.

It works the second time. Maybe it has to do with the order that things are loaded... but I'm not that worried about it.

What I'm stoked about is the major mode works flawlessly, and in Org mode it's "good enough."

Again, thank you both for your help.