[ojhughes]

Along with the various other libraries and frameworks mentioned;

* Testcontainers - seamless support for using Docker in integration tests [1]

* Project Reactor - nice framework for reactive programming [2]

* Executable Jars - No need to deploy a War file to a servlet container anymore. Build an executable Jar with an embedded container. Spring Boot makes this very easy

1. https://www.testcontainers.org

2. https://projectreactor.io