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PlantUML sources are gone in latest migration

Michal Schachter
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January 28, 2026

Hi,

During the weekend you've performed a migration in my company to a newer Confluence editor version, in this migration all my PlantUML diagram sources are removed and no method to edit my diagrams anymore.

I can't even access pre-migration sources as they seem to be deleted.

Please adivse.

3 answers

1 vote
Marc -Devoteam-
Community Champion
January 28, 2026

Hi @Michal Schachter 

This change on the editor has been announced to anyone still using the old editor.

I suggest you to reach out to the vendor/developer of the PlantUML app you are using why their macros are no not working anymore.

Michal Schachter
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January 28, 2026

Hi,

Some of these messages are not propagating to all employees and even if they do, it doesn't say explicitly that PlantUML renderer macro will not work anymore.

I have no idea who is the developer of mentioned PlantUML app as it was part of previous editor and never gave it a thought as usually its an open-source thing.

 

 

Marc -Devoteam-
Community Champion
January 28, 2026

Hi @Michal Schachter 

Check with your admins of the Cloud instance, they can see which 3rd party apps are installed.

Can you show a screenshot of a page with the UML in edit mode, we might be able to deduct which app this is?

0 votes
Kris Klima _K15t_
Community Champion
January 28, 2026

Hi @Michal Schachter 

What do you see if you edit the page on which you had an UML diagram?

Are there any remnants of the original macro? The data may not be deleted, just not accessible becasue the old macro no longer works with the new editor.

Typically, app (macro) vendors woul have a new version of their tool and/or a transition path. 

As has been mentioned, your Admin should contact the vendor of the original app and ask if there is an official transition option. It may be as simple as installing a new version that would just pick up the data and render them properly.

I used Plant UML app from Fulstech for a couple of diagrams, it still lives in my private site.

0 votes
Boris Jockov
Contributor
January 28, 2026

Hello,

Which PlantUML solution are you using?

Boris.

 

Michal Schachter
I'm New Here
I'm New Here
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January 28, 2026

Hey,

There was a PlantUML macro to render a view as part of previous Confluence editor.

I don't know the exact details as it was just part of it.

 

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