If the application is a Spring Boot application, then all the packages under the package containing the Spring Boot application class will be covered by an implicit component scan. Spring provides a mechanism to identify Spring bean candidates explicitly through the annotation. If we are using Spring Data for managing database operations, then we should use the Spring Data Repository interface instead of building our own classes. can use the stereotype for DAO classes which are responsible for providing access to database entities. can use the stereotype for classes that contain business logic or classes which come in the service layer. Spring 4.0 introduced the annotation which combines both and and makes it easy to create RESTful services that return JSON objects. Other stereotypes are a specialization of indicates that the annotated class is a Spring-managed controller that provides methods annotated with to answer web requests.

is a generic stereotype annotation used indicates that the class is a Spring-managed component. Spring components are mainly made up of four types. If Spring finds a class annotated with one of several annotations, it will consider this class as a candidate for a Spring bean to be added to the application context during component scanning. The process of searching the classpath for classes that should contribute to the application context is called component scanning. Spring resolves dependencies between Spring beans and injects Spring beans into other Spring beans’ fields or constructors. Objects in the application context are called “Spring beans” or “components”. To do dependency injection, Spring creates a so-called application context.ĭuring startup, Spring instantiates objects and adds them to the application context. This article is accompanied by a working code example on GitHub. We’ll be using a Spring Boot application for all our examples throughout this article. In this article, we’ll look at Spring component scanning and how to use it.

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