Spring @Component, @Service, @Repository, @Controller Difference

Major difference between these stereotypes is they are used for different classification.

In a multitier application, we will have different layers like presentation, service, business, data access etc. When a class is to be annotated for auto-detection by Spring, then we should use the respective stereotype as below.

• @Component – generic and can be used across application.
• @Service – annotate classes at service layer level.
• @Controller – annotate classes at presentation layers level, mainly used in Spring MVC.
• @Repository – annotate classes at persistence layer, which will act as database repository.

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