Install OH3 successful but WebUi not reachable

Hey all,
I upgraded OH2.5 and followed all the steps as described by kaikreuzer .
I can see everything is running but when I try to reach for the WebUi it says its unreachable.
What am I missing or doing wrong?

If the service is running - check with sudo service openhab status
i think you just need to wait a few mins until the initial oh3 setup page will appear


When I check the status it’s tells me OH is running but it also gives me this error:
openhab.service changed on disk. Run ‘systemctl daemon-reload’ to reload units

I googled it and I found a pretty complicated thread.

Maybe I better reinstall OH3 from scratch.

I got here the nearly the same problem:

Could you check if java 11 is installed and if it is the default version ?


If you tell me how of course.

From command line “java -version”-

Hi, have the same problem.
openjdk version “1.8.0_275”
OpenJDK Runtime Environment (Zulu (build 1.8.0_275-b01)
OpenJDK Client VM (Zulu (build 25.275-b01, mixed mode)

You are running Java 8, not Java 11!!!

That’s also my version. I thought upgrading Zulu was sufficient.

Is jave 11 still installed and may be just not made the default version ?

sudo update-alternatives --config java

you can list the installed java versions.

I installed it now via the config-tool.
Now it all seems to work

same thing for me. How can I move to Java11 from the same situation?

Use config tool from SSH to change java version.
After Java change everything works, except no paper ui, no my things. Have to link everything in new ui, or is there any easier way to do that? :slight_smile:
Btw, my grafana stopped reporting the status of all my sensors, how could i fix this?

Hey there I have the same problem that i am still on Java 8

[13:55:47] openhabian@openHABianDevice:~$ java -version
openjdk version “1.8.0_275”
OpenJDK Runtime Environment (Zulu (build 1.8.0_275-b01)
OpenJDK Client VM (Zulu (build 25.275-b01, mixed mode)

But how do I switch to 11 via the config tool (openhabian-config) I can’t find this option anywhere ;(

Any help is greatly appreciated


You need to connect via ssh to the openhab-config suite. Under point 40 you will find point 46 to reach your goal for installation of Java 11. Fits for me too. No I have the same problem like AuriuX that my sitemap doesn’t function. To link every item is an odd solution.

Hey thanks for the config numbers - did not see it before :wink:
Now I am on 11

[17:38:49] openhabian@openHABianDevice:~$ java -version
openjdk version “11.0.9” 2020-10-20 LTS
OpenJDK Runtime Environment Zulu11.43+88-CA (build 11.0.9+11-LTS)
OpenJDK Client VM Zulu11.43+88-CA (build 11.0.9+11-LTS, mixed mode)

But web gui is still not reachable - strange

(yes I did a full reboot)