FlatLAF is breaking JOSM

The FlatLAF plugin for JOSM directs me to https://www.formdev.com/flatlaf/ for further info, which directs me to here. Please tell me where to go, if this is not the right place.

What I do:

1. Install FlatLAF in JOSM
2. Restart JOSM (which works fine)
3. Select the FlatLaf Darcula theme
4. Restart JOSM (or so I thought)

Expected behavior:

JOSM coming back from restart

Actual behavior:

JOSM does not restart and I am not able to start it manually again. It just dies within one second from launching, not even showing the loading box.

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Workaround:

1. Start JOSM with the --skip-plugins parameter like this (in Windows):%JAVA_HOME%\bin\javaw.exe -jar josm-tested.jar --skip-plugins
2. JOSM starts up
   1. (just an unimportant side note: Weirdly enough, with some alternative theme loaded. If I close JOSM and start it a second time with the --skip-plugins parameter, it will load the default JOSM theme. No big worries, we don’t have to restart it such a second time for the solution to work)
3. Close JOSM.
4. Start JOSM normally (without the --skip-plugins parameter)
5. Uninstall FlatLAF

Context:

JOSM Version 18583

Same problem occurs on a completely newly installed JOSM without any cache, preferences, plugins.

I am using the JOSM parameters -Djosm.home=. -Djosm.pref=./preferences -Djosm.cache=./cache as documented here, as I want to have those close by and my JOSM as a stand alone application

[DevCharly]

The issue is fixed in JOSM flatlaf plugin version 36036.

[mikkolukas]

@tsmock Inside JOSM, where you install plugins, you’ll find the JOSM FlatLaf plugin listed as shown here:

The link leads directly to https://www.formdev.com/flatlaf/, misleading one to:

1. Believe that FlatLaf and the JOSM FlatLaf plugin is the one and same thing (I suspected it was not).
2. Not have a proper place to report errors that are related to the JOSM FlatLaf plugin, but not FlatLaf itself (I did a good effort to google for it, but couldn’t find it anywhere).

Hence the situation we are now in, that I reported the bug to FlatLaf, while the error was in the JOSM FlatLaf plugin, bothering the upstream developer.