Implementing Spring Data JPA in Hexagonal Architecture

Mixing database details with core business logic makes software rigid and difficult to maintain over time. Hexagonal architecture solves this by separating your application's core logic from external infrastructure, but implementing this separation with modern database frameworks requires a clear strategy. This text-based course guides you through designing and implementing clean persistence adapters using Spring Data JPA, ensuring your core logic remains entirely independent of database-specific libraries. What you'll learn: - Understand the core principles of hexagonal architecture and the ports-and-adapters pattern. - Create decoupled persistence adapters using Spring Data JPA interfaces. - Map database entities to clean domain models to prevent framework leakage. - Implement repository ports that define how the application interacts with data storage. - Apply modern Java features like records for clean data transfer and state mapping. - Write targeted integration tests to verify database behavior without polluting core domain logic. You will start with the fundamental concepts of hexagonal architecture, defining ports and domain models. From there, you will read through step-by-step implementations of JPA entities, mappers, and repository adapters, concluding with strategies for robust integration testing. This course is designed for Java developers who understand basic Spring Boot and want to transition to clean architecture patterns. No prior experience with hexagonal architecture is required. Start reading today to build cleaner, more maintainable enterprise applications.