In this session, we will implement a Spring Boot application together while providing you with theoretical information about how Spring works internally. Basically, we will create a project with Spring CLI, then set up our dependencies via autoconfiguration by using Twelve-Factor App notation, finally, we will implement a REST endpoint to deep dive some internals of Spring Boot. It doesn't matter if you are an experienced Spring developer or a new starter, I bet you will learn something new in this session ;-)