Question: Can We Replace @Service With @Component?

What is the difference between @RestController and @controller?

Difference between @RestController and @Controller in Spring.

The @Controller is a common annotation which is used to mark a class as Spring MVC Controller while the @RestController is a special controller used in RESTFul web services and the equivalent of @Controller + @ResponseBody ..

What is difference between @configuration and @component?

@Component Indicates that an annotated class is a “component”. Such classes are considered as candidates for auto-detection when using annotation-based configuration and classpath scanning. A @Configuration is also a @Component, but a @Component cannot act like a @Configuration.

What is the use of @component?

@Component is the most generic Spring annotation. A Java class decorated with @Component is found during classpath scanning and registered in the context as a Spring bean. @Service , @Repository , and @Controller are specializations of @Component , which are used for more specific cases.

What is a difference between @component @service 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 the difference between @component @controller @repository & @service annotations?

@Component is a generic annotation. Difference of @Service, @Repository, @Controller with @Component is they are special cases of @Component and used for particular purposes. The difference is just classification only. For all these annotations (stereotypes), technically the core purpose is same.

What is use of @configuration?

Spring @Configuration annotation is part of the spring core framework. Spring Configuration annotation indicates that the class has @Bean definition methods. So Spring container can process the class and generate Spring Beans to be used in the application.

Is @RestController a stereotype?

springframework. stereotype package. … @RestController is a convenience annotation that is itself annotated with @Controller and [@ResponseBody](https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/bind/annotation/ResponseBody.html” annotation in org. springframework.

Can we replace @service with @component?

You can use @Service over @Component in service-layer classes as it specifies intent in a better way. @Repository: This annotation is a specialization of the @Component annotation with similar use and functionality.

What is the 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.

Can we use @service instead of @controller?

No, @Controller is not the same as @Service , although they both are specializations of @Component , making them both candidates for discovery by classpath scanning. The @Service annotation is used in your service layer, and @Controller is for Spring MVC controllers in your presentation layer.

Can we use @component instead of @repository?

We can use @Component across the application to mark the beans as Spring’s managed components. Spring only pick up and registers beans with @Component and doesn’t look for @Service and @Repository in general.

What is the difference between @service and @repository?

Both @Service and @Repository annotations are the specializations over the @Component annotation. @Repository is a stereotype used for persistence layer. It translates any persistence related exceptions into a Spring’s DataAccessException. @Service is used for the beans at the service layer.

Can we replace @controller with @component?

2 Answers. @Controller is a @Component (just like @Service , @Repository , @Endpoint etc.). The @Component is used as a meta-annotation here so that it can be picked-up using component-scanning. Next to that the @Controller is a special component which will have some added functionality (Spring MVC takes care of that).

Is @component a singleton?

Yes, that is correct, @Component is a Spring bean and a Singleton. About singletons – spring beans are all in singleton scope by default.

What is the difference between @bean and @component?

Both approaches aim to register target type in Spring container. The difference is that @Bean is applicable to methods, whereas @Component is applicable to types. Therefore when you use @Bean annotation you control instance creation logic in method’s body (see example above). With @Component annotation you cannot.

What is difference between @inject and @autowired?

The @Autowired annotation is used for auto-wiring in Spring framework. … The @Inject annotation also serves the same purpose, but the main difference between them is that @Inject is a standard annotation for dependency injection and @Autowired is spring specific.

What is difference between @component and @controller?

@Component is a generic stereotype for any Spring-managed component. @Repository, @Service, and @Controller are specializations of @Component for more specific use cases, for example, in the persistence, service, and presentation layers, respectively.

What is @controller in spring boot?

@Controller annotation indicates that the annotated class is a controller. It is a specialization of @Component and is autodetected through classpath scanning. It is typically used in combination with annotated handler methods based on the @RequestMapping annotation.

What is spring bean life cycle?

Advertisements. The life cycle of a Spring bean is easy to understand. When a bean is instantiated, it may be required to perform some initialization to get it into a usable state. Similarly, when the bean is no longer required and is removed from the container, some cleanup may be required.