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Designing Hexagonal Architecture with Java is a seminal book by Davi Vieira (first published in early 2022) that provides a blueprint for creating maintainable, change-tolerant applications. It centers on the "Ports and Adapters" pattern, which isolates the core business logic from external technology concerns like databases and web frameworks. 1. Architectural Core: The Three Hexagons

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@PostMapping("/accounts/id/withdraw") public void handle(@PathVariable Long id, @RequestBody MoneyDto dto) withdrawUseCase.withdraw(id, dto.toMoney());
  • AuthenticationServiceAdapter: implements the AuthenticationService interface using a authentication mechanism (e.g., JWT)
  • UserRepositoryAdapter: implements the UserRepository interface using a database (e.g., Hibernate)