I’ve got also many java based errors in the log since I’ve changed the system to the milestone builds. I’ve used zulu8.38.0.163-ca-jdk1.8.0_212-linux_aarch32hf as java. Today, I upgraded java to zulu8.40.0.178-ca-jdk1.8.0_222-linux_aarch32hf, and everything healed. Openhab starts without any issue, there is no errors in the log, and finally the rest api also works fine without the error 500 issue with regards of swagger.json. It was faulty since the beginning.
I’ve used this procedure for java upgrade:
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