Use a newer or specific version of PlantUML in Jetbrains-based IDEs

howto.md

Use Intellij stuff with PlantUML

Source:

• https://youtrack.jetbrains.com/articles/SUPPORT-A-736/How-to-change-the-version-of-PlantUML-JAR-used-by-IntelliJ-IDEA
• https://youtrack.jetbrains.com/issue/IJPL-92405/PlantUML-theme-is-not-recognized-because-of-low-version-of-the-plugin#focus=Comments-27-5700177.0-0 for Mac specifics

TL;DR:

• The JAR is located in ~/Library/Caches/JetBrains/{Productname}/markdown/download/plantumllanguageextension/plantuml.jar.
  • You can confirm the (old) version with java -jar plantuml.jar --version.
  • Delete the JAR or the plantumllanguageextension.
• Find the most recent JAR in under the Github Releases
  • copy its hyperlink so that you have https://github.com/plantuml/plantuml/releases/download/v1.2025.2/plantuml-1.2025.2.jar
• Open the IDE, open the Registry with Shift-Shift and type registry. Open the matching Registry… command.
  • Find the item of markdown.plantuml.download.link, and overwrite the value of the .jar URL from your clipboard
• Go to File | Settings | Languages & Frameworks | Markdown and click 'Install' next to the PlantUML extension -> this will force the IDE to download the JAR from the location you specified in the registry.
  • You might restart the IDE.
  • the .jar file in /markdown/download/plantumllanguageextension/ should exist now

For Graphviz: https://stackoverflow.com/a/71052034/1388892

TL;DR: brew install graphviz