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@Override public Optional<Product> findById(String id) return jpaRepository.findById(id).map(this::toDomain);

@PostMapping("/products") public Product createProduct(@RequestBody CreateProductCommand command) return createProductUseCase.execute(command); designing hexagonal architecture with java pdf

// Note: ProductJpaEntity is a JPA-annotated class that the domain never sees. // bootstrap/Application.java @SpringBootApplication public class Application public static void main(String[] args) SpringApplication.run(Application.class, args); // Manual wiring if not using Spring's @Autowired on fields @Bean public CreateProductService createProductService(ProductRepository repo) return new CreateProductService(repo); @Override public Optional&lt

private Product toDomain(ProductJpaEntity entity) ... // depends on outgoing port

// domain/model/Money.java public record Money(double amount, String currency)

@RequiredArgsConstructor public class CreateProductService implements CreateProductUseCase private final ProductRepository productRepository; // depends on outgoing port