Important Interview Question of Spring annotation : @Component, @Controller, @Repository & @Service

#Component #Controller #Repository #Service

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From Spring 2.5 annotation-based dependency injection was introduced, which automatically scans and registers classes as Spring bean which is annotated using @Component annotation.

This means you don't declare that bean using the bean tag and inject the dependency, it will be done automatically by Spring. This functionality was enabled and disabled using context:component-scan tag.

Now that you know what does @Component annotation does let's see what does @Service, @Controller, and @Repository annotation do.

They are nothing but the specialized form of @Component annotation for certain situations. Instead of using @Component on a controller class in Spring MVC, we use @Controller, which is more readable and appropriate.

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Debu Paul

[shamimahamed]

Thank you sir, i have been looking this topic for 10 days,

But you lecture is so clear to get this difficulty with easy way.😊

[sowmyal]

such a clear explanation. Cleared my long pending doubt. thanks so much.

[kiranmete]

very clear..one doubt.."exception will be thrown by @repository u plz explain this line as exception is thrown by piece of code

[GMIqbalMahmud]

Thanks for the video. May i know what is the source of your knowledge? I mean how did you clear your concepts? I want to go through that along with your videos. Thanks again. Keep up the good work.

[bachelortadka]

Thanks for your explanation ...I have one doubt that Can we use other stereotype annotations instead of @Repository?

[Lifeinmumbai]

Great yr..why don't I found it earlier

[imamhusen]

It's worth of watching this video....👌👏👏

[saeedahmedsheikh]

Great way of explanation .. love from Pakistan

[puneetsaneja]

@RequestMapping would not work with @component ?

[gyanverma]

hello sir, can we use @service in place of @repository, what will happen.

[aniruddhachunne]

your explanation is so clear... but there is problem with how you speak

[bhushanbhamare]

good explanation, i always confuse but now clear thanks
can u plz @SpringBootApplication Annotation

[RahulThakur-jlpm]

Is it manday to annotate the class with @Component to use it with @Autowired annotation...?