Clean Architecture, Hexagonal Architecture & DDD for Spring Boot

Overview

This skill provides comprehensive guidance for implementing Clean Architecture, Hexagonal Architecture (Ports & Adapters), and Domain-Driven Design tactical patterns in Java 21+ Spring Boot 3.5+ applications. It ensures clear separation of concerns, framework-independent domain logic, and highly testable codebases through proper layering and dependency management.

When to Use

• Architecting new Spring Boot applications with clear separation of concerns
• Refactoring tightly coupled code into testable, layered architectures
• Implementing domain logic independent of frameworks and infrastructure
• Designing ports and adapters for swappable implementations
• Applying Domain-Driven Design tactical patterns (entities, value objects, aggregates)
• Creating testable business logic without Spring context dependencies

Instructions

1. Understand the Core Concepts