Switching to Java21 failed

Apps & Services openHABian
1

I attempted to switch to Java 21 in preparation for OH 5.0, but the installation failed.
How can I collect debug information to troubleshoot this issue?

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openhabian@openhabian:~ $ sudo openhabian-config
2025-03-07_12:01:04_CET [openHABian] Checking for root privileges... OK
2025-03-07_12:01:05_CET [openHABian] Making sure router advertisements are available... OK
2025-03-07_12:01:05_CET [openHABian] Loading configuration file '/etc/openhabian.conf'... OK
2025-03-07_12:01:05_CET [openHABian] openHABian configuration tool version: [openHAB]{2025-02-20T19:12:19-07:00}(ec66792)
2025-03-07_12:01:05_CET [openHABian] Checking for changes in origin branch openHAB... Updates available... SKIP
2025-03-07_12:03:50_CET [openHABian] Updating Linux package information... OK
2025-03-07_12:03:50_CET [openHABian] Updating Linux package information... OK
2025-03-07_12:03:51_CET [openHABian] Fetching OpenJDK 21... OK
2025-03-07_12:04:28_CET [openHABian] Installing OpenJDK 21... FAILED
2025-03-07_12:47:14_CET [openHABian] Checking for default openHABian username:password combination... OK
2025-03-07_12:47:14_CET [openHABian] We hope you got what you came for! See you again soon ;)
2

See here

However, Java 21 ist not officially supported for openhab 4.x
I would install Java 21 if you upgrade to openhab 5

3

I tried the same java 21 update and failed with the same dependency errors. I think the guidance is don’t do this until you upgrade to OH5.
l

4

I also tried to update to Java21 to be prepared for OH 5.0 (before I read these issues here).

And I also failed. I used openhabian-config for the update and the system crashed while updating.

Afterwards, I tried to repair it with a manual apt-get update and apt-get upgrade - unfortunately this ended in a Frankendebian.

Only solution was to setup the system fresh und restore a backup (lucky to have one :wink: