A. Pay Zulu for support and they probably know why and how to get it going.
B. Just buy an Odroid C2 as they have a big community to ask and also fix bugs in the base images they supply.
C. Try another java like Oracle or openjava, but since they are not the recommended ones to use you do raise the odds you will hit a unique bug in Openhab that no one else has seen.
Sorry I do not have any troubles, it took me a day to work out how to do a manual install of Zulu as there were no guides anywhere on how to do it step by step. My setup is working great for almost 6 months now and used daily…
I posted this guide here as it takes you through the steps with more info on getting the java sorted. If java is not running right, then dont bother trying openhab.