com.myapp ├── domain │ ├── model (Product, User, etc.) │ └── ports (inbound: CreateProductUseCase, outbound: ProductRepositoryPort) ├── application │ └── services (ProductService implements CreateProductUseCase) ├── adapters │ ├── inbound (web: ProductRestController) │ └── outbound (persistence: ProductJpaAdapter implements ProductRepositoryPort) └── configuration (Spring config, beans) Inbound Port (Use Case Interface):
package com.myapp.domain.ports.outbound; public interface ProductRepositoryPort Product save(Product product); Optional<Product> findById(String id); | | Java version | References Java 11 or 17 (not Java 8)
If you are a Java developer looking to move beyond layered architectures (Controller-Service-Repository), you have likely searched for resources like "Designing Hexagonal Architecture with Java PDF free 2021 download." record (Java 14+)
// constructor, business methods (e.g., applyDiscount) etc.) │ └── ports (inbound: CreateProductUseCase
language:java topic:hexagonal-architecture created:2021-01-01..2021-12-31 Many repositories include a docs/design.pdf or presentation.pdf inside – completely legal. Once you obtain a PDF purporting to be "Designing Hexagonal Architecture with Java" from 2021, verify it with these checks:
| Check | What to look for | |-------|------------------| | | Should be Davi Vieira (Packt) OR a known community author. | | Publication date | September 2021 or later. | | Java version | References Java 11 or 17 (not Java 8). | | Code samples | Uses var , record (Java 14+), and JUnit 5. | | ISBN (if full book) | 978-1800565115 (Packt, 2021). |