Hexagonal Architecture in Spring Boot — Win a Free Book

We're Running a Contest — Refactor to Hexagonal Architecture and Win a Book I just published a full tutorial on Hexagonal Architecture in Spring Boot, and we're running a contest alongside it. The prize is "Get Your Hands Dirty on Clean Architecture" by Tom Hombergs as an ebook — the book that popularized this exact pattern in the Java world. What the video covers In Episode 1 of my Spring Boot series I showed a basic api/domain/infrastructure structure. This episode takes it further — proper Ports & Adapters, an explicit application layer, and the thing that makes it all worth it: business logic tests that run in 50 milliseconds instead of 45 seconds. The key insight the video builds toward: Spring's dependency injection is already the hexagonal mechanism. When your controller injects RegisterUser and Spring provides RegisterUserService — that IS ports and adapters. You just need to be intentional about which interfaces go where. → [Watch the full episode here: youtube link] The c