I understand that the following might not be enough to debug the problem. I am trying to get ideas so as to find a workaround to this problem. Therefore, please do not hesitate to ask for more ...

I'm currently using 2.9.6 and just enabled the Jdk8Module Deserialising Optionals results in the trace below. Downgrading just the Jdk8Module artifact to the latest 2.8.x version fixes the issue. java ...