For Java developers, this architectural style is not just an academic exercise; it brings tangible benefits to real-world projects:
Business rules are clearly separated from infrastructure code. 2021 Trends and Best Practices in Hexagonal Java
com.example.myapp │ ├── domain/ <-- The Inside (No external frameworks) │ ├── model/ <-- Pure business objects (e.g., Order, User) │ └── exception/ <-- Domain-specific exceptions │ ├── ports/ <-- The Gatekeepers │ ├── inbound/ <-- Use cases called by controllers (e.g., CreateOrderUseCase) │ └── outbound/ <-- Interfaces for external systems (e.g., OrderRepositoryPort) │ └── infrastructure/ <-- The Outside ├── adapters/ │ ├── inbound/ <-- REST Controllers, CLI, GraphQL │ └── outbound/ <-- Database repositories, HTTP clients, Mail senders └── config/ <-- Spring dependency injection wiring Use code with caution. Step-by-Step Java Implementation For Java developers, this architectural style is not
package com.myapp.domain.model;
@Component public class ProductJpaAdapter implements ProductRepositoryPort private final ProductSpringJpaRepository jpaRepository; This link or copies made by others cannot be deleted
If you need an example of .
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: Swap out Spring Boot, Quarkus, or databases without altering core logic.
Implement the inbound port within the domain layer. This class orchestrates the business logic and calls outbound ports.