Hexagonal Architecture: Ports and Adapters in Java

Stop building tightly coupled monoliths. This deep dive into Hexagonal Architecture (Ports and Adapters) provides the exact Java implementation details required to decouple your business logic from infrastructure frameworks like Spring Boot and JPA. We define the Core Domain boundary, structure the required Java packages (port.in, port.out, adapter.in, adapter.out), and demonstrate how to implement Driving Ports (Input) via REST controllers and Driven Ports (Output) via persistence layers. Learn the concrete steps for applying the Dependency Inversion Principle to achieve true infrastructure independence, enabling rapid technology swaps and highly isolated unit testing of your application services. Focus on practical code examples and strict dependency rules for system analysts and senior developers. 00:00: Inverting Infrastructure Dependency 00:47: Defining the Application Core 01:25: Driving Ports Input Contracts 02:00: Implementing Driving Adapters 02:37: Driven Ports Output Contracts 03:12: Implementing Driven Adapters 03:43: Java Package Structure Enforcement 04:32: Isolated Core Unit Testing 05:08: Infrastructure Swapping Benefits ##HexagonalArchitecture ##PortsAndAdapters ##JavaArchitecture ##SoftwareDesign ##CleanArchitecture ##DependencyInversion ##SystemDesign