Fixing PlantUML in org-babel

  • "Exception in thread "main" java.awt.AWTError: Can't connect to X11 window server using ':1' as the value of the DISPLAY variable."
  • Seems to be because it isn't running headless. Which, from plantuml-java-args, it looks like it should be. However, when running via babel, it appears those args aren't used?
  • I made a fix by editing \~/.emacs.d/elpa/26.3/develop/org-plus-contrib-20201116/ob-plantuml.el and adding in "-Djava.awt.headless=true" to the args passed to the jar.


(t (list java
         (shell-quote-argument (expand-file-name org-plantuml-jar-path))))))


(t (list java
         "-jar -Djava.awt.headless=true"
         (shell-quote-argument (expand-file-name org-plantuml-jar-path))))))
  • But this is temporary - it will be overwritten when org-plus-contrib package is updated.
  • And how come it was working a couple of weeks ago - what changed?

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