Designing Hexagonal Architecture With Java Pdf [better] May 2026

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

// application/port/in/CreateProductUseCase.java (Incoming Port) package com.example.application.port.in; import com.example.domain.model.Product; public interface CreateProductUseCase { Product execute(CreateProductCommand 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); public interface ProductRepository Optional&lt

public interface ProductRepository Optional<Product> findById(String id); void save(Product product); void save(Product product)

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

@SpringBootTest @Testcontainers class JpaProductRepositoryTest @Container static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:15"); @Test void shouldSaveAndRetrieve() // ... real database test

// application/service/CreateProductService.java package com.example.application.service; import com.example.application.port.in.CreateProductUseCase; import com.example.domain.model.Money; import com.example.domain.model.Product; import com.example.domain.spi.ProductRepository; import lombok.RequiredArgsConstructor;