Hexagonal Architecture Layers Java

What it does

This skill enables AI agents to generate Java code following the Hexagonal Architecture pattern, also known as Ports and Adapters. It structures applications by isolating business logic behind ports while delegating external interactions like databases or user interfaces to adapters.

When to use it

• Building enterprise-grade Java applications requiring high testability and loose coupling.
• Creating systems where business rules must remain independent of infrastructure frameworks.
• Developing microservices that need clear boundaries between core logic and external dependencies.
• Refactoring legacy monolithic codebases into modular, maintainable architectures.

Key capabilities

• Generates domain entities and use cases free from framework dependencies.
• Creates interface definitions (ports) for input and output operations.
• Implements concrete adapters for database access, messaging systems, and UI layers.
• Structures projects to separate core business logic from external concerns.

Example prompts

• "Create a Java service for processing payments using Hexagonal Architecture with an in-memory adapter."
• "Generate the port and adapter interfaces for integrating a REST API into a domain-driven application."
• "Design a repository interface and its JPA implementation for a user management system following Ports and Adapters."

Tips & gotchas

Ensure your AI agent understands that core business logic must never import framework classes directly. Start by defining the ports (interfaces) before implementing any adapters to maintain architectural integrity.