The term 'Hexagonal Architecture' has been around for a long time. But would you know how to implement this architecture style in actual code? This article provides such a way.
Why are immutable objects a way to create safer software that is easier to maintain? And what are best practices to implement them? This article provides answers.
Some thoughts about validation in general, Bean Validation in particular, and why I consider some applications of Bean Validation an anti-pattern.