46. Using Services and Repositories to Support our Spring MVC Controllers

The Controller-Service-Repository pattern:

Service:

In the Controller-Service-Repository pattern, the service layer sits between the controller and the repository.

The service layer contains the business logic of the application.

It orchestrates interactions between multiple repositories (data access objects) and performs any necessary processing on the data before passing it back to the controller.

Services are often implemented as Spring-managed beans, using annotations like @Service

Why Use Root Context?

Sharing Beans: Avoid duplication, share beans across multiple servlets.

Global Configuration: Non-web components belong here, ensuring initialization once.

Testability: Easier testing of non-web components in isolation.

Scalability: Better organization and maintainability as the application grows.

Promotes better organization, reusability, and maintainability of application code.