Openhabian: OpenJDK vs. Oracle Java?

openHABian uses Zulu. Its basically an optimized openJDK.
For ARM (rPis), Zulu embedded is used.

You can try to switch to Oracle but I am afraid that your problems will not go away (I don’t know what is the root cause of your problems :frowning:)

There are many guides online on how to deploy Oracle JVM on Raspberry Pi. Remember to use update-alternatives --config java after you install another JVM to select it as default.