Hello everyone, I actually thought the whole time I had already written an article about this. Then I realized that although I’ve already mentioned ArchUnit a few times, but I haven’t written anything about it, except in my Obsidian Vault. So I’ll catch up on that today.

“But locally everything went green!”

We all know this pain: your pipeline is green, your tests run locally in milliseconds. You deploy to staging or production – and it works. SQLSyntaxErrorException. Or worse: data is stored incorrectly.

Do you know that? You start a new project with a clean domain model. Your Order entity is perfectly normalized, the database relationships are cleanly defined (3rd normal form), and saving an order is lightning fast. Everything feels right.