Hexagonal Architecture in Java: Decoupling the Database

Tying your Java application directly to a specific database technology often leads to rigid code that is difficult to test, maintain, and evolve. By separating your core business logic from external systems, you can build adaptable software that stands the test of time. This text-based course guides you through the principles of Hexagonal Architecture (Ports and Adapters) to abstract your persistence layer. You will learn how to define clear domain boundaries, implement flexible repository interfaces, and swap database implementations without changing a single line of your core business rules. What you'll learn: - Understand the fundamental concepts of Hexagonal Architecture, including ports, adapters, and domain boundaries. - Design robust repository interfaces using modern Java features like records and interfaces. - Implement database-specific adapters for relational and non-relational storage systems. - Apply clean testing strategies using mocks and in-memory databases to verify business logic independently. - Refactor legacy tightly-coupled Java code into a clean, decoupled architectural pattern. The course begins with foundational architectural definitions before guiding you through structured code examples and written exercises. You will progress from basic interface design to fully decoupled database adapters. This course is designed for Java developers who want to improve their software design skills. No prior experience with Hexagonal Architecture is required, as we start with key terminology and build your knowledge step-by-step. Start reading today to master clean architecture and write highly maintainable Java applications.