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// Inside application/port/in/MarkOrderAsPaidUseCase.java public interface MarkOrderAsPaidUseCase { void markPaid(MarkPaidCommand command); }

✅ Test your domain logic in isolation without needing a real database or server. designing hexagonal architecture with java pdf download

Notice: The Order domain never saw @Entity . The controller never saw JpaRepository . The service never saw RestTemplate . // Inside application/port/in/MarkOrderAsPaidUseCase

A well-structured serves as an excellent offline companion. It should give you runnable examples, checklists, and common refactoring steps. Pair that PDF with an actual project—perhaps a simple banking or e-commerce domain—and refactor it from layered to hexagonal. That is where real learning happens. designing hexagonal architecture with java pdf download