Spring Boot Tutorial 0/110 lessons ~6 min read Lesson 90

    Clean Architecture

    Clean Architecture (Uncle Bob) puts the business core at the centre and pushes frameworks, DBs and HTTP to the outside.

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    Introduction

    Clean Architecture (Uncle Bob) puts the business core at the centre and pushes frameworks, DBs and HTTP to the outside. Dependencies point inward. The result: business logic that survives framework upgrades and DB swaps.

    Syntax reference

    Concentric layers — dependencies point inward:

    bash
    ┌──────────────────────────────────────────────┐
    │ Frameworks & Drivers │
    (Spring, JPA, REST, Kafka, AWS clients)
    │ ┌──────────────────────────────────────┐ │
    │ │ Interface Adapters │ │
    │ │ (Controllers, Repository impls, │ │
    │ │ Mappers, External clients) │ │
    │ │ ┌──────────────────────────────┐ │ │
    │ │ │ Application / Use Cases │ │ │
    │ │ │ (PlaceOrderUseCase, ...) │ │ │
    │ │ │ ┌──────────────────────┐ │ │ │
    │ │ │ │ Enterprise / Domain │ │ │ │
    │ │ │ │ Order, Money, Policy │ │ │ │
    │ │ │ └──────────────────────┘ │ │ │
    │ │ └──────────────────────────────┘ │ │
    │ └──────────────────────────────────────┘ │
    └──────────────────────────────────────────────┘
    inward arrows only — domain knows nothing of Spring
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