Recently, in one of my pet projects, I decided to try writing tests using Spock framework. It was a great experience, I enjoyed it a lot. Except for the part of setting it up, which was somewhat annoying.
I've been experimenting with servlet filters, along the same lines as my experimentation with aspects. This post explores servlet filters in a spring application.
Exploring aspect oriented programming approaches using Spring AOP as a starting point
Exploring spring boot and replication, with an easy to adapt example replicated MySQL cluster provided by containerized databases
Bootstrapping spring boot docker containers with maven