Today I ran apt upgrade on my Ubuntu 18.04 LTS and after that, an installed JavaFX 8 application (internally developed tool) stopped working.

Running the application only brings the following error:

$ java -jar app.jar
Error: Could not find or load main class ui.Main

As it turns out, Canonical decided to ship a new version of openjfx. (Incidentally, is there a place where one can see such version changes/decisions?)

The relevant information can be found in /var/log/apt/history.log:

Start-Date: 2019-04-29  07:10:19
Commandline: apt upgrade
Requested-By: tannerli
Install: [snip]
Upgrade: [...]
openjfx:amd64 (8u161-b12-1ubuntu2, 11.0.2+1-1~18.04.2)
openjfx-source:amd64 (8u161-b12-1ubuntu2, 11.0.2+1-1~18.04.2)
libopenjfx-java:amd64 (8u161-b12-1ubuntu2, 11.0.2+1-1~18.04.2)
libopenjfx-jni:amd64 (8u161-b12-1ubuntu2, 11.0.2+1-1~18.04.2)

There's an open bug at LaunchPad and quite a few similar questions on various StackExchange sites concerning this, this one for example. None of those fit my specific needs. Seems there is no real solution to this day, only a


Explictly downgrade all openjfx packages to the previous version:

$ sudo apt install openjfx=8u161-b12-1ubuntu2 libopenjfx-java=8u161-b12-1ubuntu2 libopenjfx-jni=8u161-b12-1ubuntu2 openjfx-source=8u161-b12-1ubuntu2

Hold back the affected packages, so that the next apt upgrade won't break things again:

$ sudo apt-mark hold libopenjfx-java libopenjfx-jni openjfx openjfx-source

This will show up as info when you're upgrading next time:

$ sudo apt upgrade
The following packages have been kept back:
  libopenjfx-java libopenjfx-jni openjfx openjfx-source
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.

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