Hi!
There is now (as of this afternoon) a docker image that sets up both a
server and client for SciTokens:
https://github.com/scitokens/docker-scitokens-java
I have cc-ed the author of this docker image (Duncan Brown) and have put
this on the SciTokens discuss list to carry our discussion there.
Hopefully this will be of use to you.
Cheers,
Jeff