What is @component annotation in Spring?
@Component is an annotation that allows Spring to automatically detect our custom beans. In other words, without having to write any explicit code, Spring will: Scan our application for classes annotated with @Component. Instantiate them and inject any specified dependencies into them. Inject them wherever needed.
Does @component create a bean?
We cannot create a bean of a class using @Component, if the class is outside spring container whereas we can create a bean of a class using @Bean even if the class is present outside the spring container.
Can we use @component instead of service?
We can use @Component across the application to mark the beans as Spring’s managed components. Spring will only pick up and register beans with @Component, and doesn’t look for @Service and @Repository in general. @Service and @Repository are special cases of @Component.
What is @service annotation in Spring?
Spring @Service annotation is used with classes that provide some business functionalities. Spring context will autodetect these classes when annotation-based configuration and classpath scanning is used.
What is difference between @service and @component?
@Component is a generic stereotype for any Spring-managed component or bean. @Repository is a stereotype for the persistence layer. @Service is a stereotype for the service layer. @Controller is a stereotype for the presentation layer (spring-MVC).
What are spring components?
Overview of the Spring framework
- Core container. Core. Bean. Context. Expression Language.
- Aspect-oriented programming (AOP) AOP. Aspects. Instrumentation.
- Data access and integration. JDBC. JPA/ORM. JMS. Transactions.
- Web. Web/REST. Servlet. Struts.
What is difference between @configuration and @component?
The main difference between these annotations is that @ComponentScan scans for Spring components while @EnableAutoConfiguration is used for auto-configuring beans present in the classpath in Spring Boot applications.
What is difference between @service and component?
@Component : It is a basic auto component scan annotation, it indicates annotated class is an auto scan component. @Controller : Annotated class indicates that it is a controller component, and mainly used at the presentation layer. @Service : It indicates annotated class is a Service component in the business layer.
What are services in spring?
Advertisements. Service Components are the class file which contains @Service annotation. These class files are used to write business logic in a different layer, separated from @RestController class file.
What is spring repository?
The Spring @Repository annotation is a specialization of the @Component annotation which indicates that an annotated class is a “Repository”, which can be used as a mechanism for encapsulating storage, retrieval, and search behavior which emulates a collection of objects.
What is difference between @component and @repository?
The difference between them is, @component is used to annotate compound classes, @Repository is a marker for automatic exception translation in the persistence layer, for service layer we need to use @service. You can refer Spring Documentation to know more.
What is Spring component scan?
Using component scan is one method of asking Spring to detect Spring-managed components. Spring needs the information to locate and register all the Spring components with the application context when the application starts. Spring can auto scan, detect, and instantiate components from pre-defined project packages.
