Spring boot @Controller VS @Component
Spring has different annotations for different purposes. Often the stereotype annotations are contradicted by the umbrella @Components annotation. Let’s start with the basic definitions, a Component is a generic stereotype for any spring-managed bean. It provides an optional parameter value of String type which indicated the logical name for that component, to be turned into a spring bean in the case of auto-detection, like by @ComponentScan.
The component annotation from the org.springframework.stereotype package is further extended into specialized stereotypical annotations defining conceptually the roles of these types/methods in the overall architecture.
@Repository: Defines that the annotated class encapsulates the CRUD mechanisms as the DAO classes with the possible spring exceptions DataAccessException and PersistenceExceptionTranslationPostProcessor.
@Service: Defines that the annotated class offers some operation like supporting the business logic with no encapsulation methods. In most cases, it uses the repository classes to perform the CRUD functionality.
@Controller: Defines that the annotated class is mostly used in the presentation layer like a web controller in combination with other annotated handler methods. With Spring MVC namespace, @RestController annotation is furthermore…
