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The Service Layer pattern separates business logic from controllers and data access layers in Spring Boot applications. This architectural pattern creates a dedicated layer for business rules between controllers and repositories, improving code maintainability, testability, and reusability. The guide demonstrates implementing a user management system with Spring Boot and MongoDB, showing how controllers handle HTTP concerns, services contain business logic, and repositories manage data persistence. Key benefits include transaction management, clear separation of concerns, and the ability to swap implementations without affecting business logic.

Service Layer Pattern in Java With Spring Boot

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