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The service implements the inbound port and relies on the outbound port interface via dependency injection.

UI, REST Controllers, CLI. They drive the application.

Hexagonal Architecture decouples core business logic from external frameworks, databases, and user interfaces. Also known as Ports and Adapters, this pattern enhances testability, maintainability, and flexibility. The service implements the inbound port and relies

: Discover how to use Java modules to strictly enforce architectural boundaries and prevent "leaky abstractions". Where to Find the Book and Resources

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The book bridges the gap between Hexagonal Architecture and DDD. It features:

: You can switch from a SQL database to a NoSQL one by only changing a driven adapter; your core business logic remains untouched. Optional findById(UUID id)

// Outbound Port public interface UserRepositoryPort User save(User user); Optional findById(UUID id); Use code with caution. 3. Driven Adapters (Infrastructure Layer)

public String getName() return name;

Requires mapping data between multiple architectural layers.