Designing Hexagonal Architecture With Java Pdf Jun 2026

The ports define how the application interacts with the outside world.

The "heart" of the application containing business rules, entities, and use cases. It is written in Plain Old Java Objects (POJOs) and must remain free of framework-specific annotations like JPA or Spring. designing hexagonal architecture with java pdf

my-hexagonal-app/ ├── pom.xml (parent) ├── domain/ │ ├── pom.xml │ └── src/main/java/com/example/domain/ │ ├── model/ │ └── spi/ (Outgoing ports interfaces) ├── application/ │ ├── pom.xml │ └── src/main/java/com/example/application/ │ ├── service/ (Use case implementations) │ └── port/in/ (Incoming ports interfaces) ├── adapters/ │ ├── persistence/ │ │ ├── pom.xml │ │ └── src/main/java/... (JPA driven adapter) │ ├── web/ │ │ ├── pom.xml │ │ └── src/main/java/... (REST driving adapter) │ └── messaging/ (Kafka/RabbitMQ adapter) └── bootstrap/ (Main class & config) The ports define how the application interacts with

Designing Hexagonal Architecture with Java.pdf my-hexagonal-app/ ├── pom

Elias realized the power of this instantly. If OrderService depended on an interface, he could swap the database without touching the service.

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