Alma9-related issue: Java16 and newer are more strict with reflection

Context: https://gitlab.cta-observatory.org/cta-computing/acada/resource-manager-base/-/issues/229.

In the MR for this issue I'll describe the problem and solution in some more detail. [Edit: @mlinhoff, it seems I cannot create a merge request in this project. Do you want to create one that I can modify/push to?]