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Difference between @Bean and @Component annotation in Spring.
Spring supports multiple types annotations such as @Component,@Controller,@service @Repository and @Bean. All theses can be found under the org.springframework.stereotype package.
When classes in our application are annotated with any of the above mentioned annotation then during project startup spring scan(using @componentScan) each class and inject the instance of the classes to the IOC container. Another thing the @ComponentScan would do is running the methods with @Bean on it and restore the return object to the Ioc Container as a bean.
Sr. No. | Key | @Bean | @Component |
---|---|---|---|
1 | Auto detection | It is used to explicitly declare a single bean, rather than letting Spring do it automatically. | If any class is annotated with @Component it will be automatically detect by using classpath scan. |
2 | Spring Container | Bean can be created even class is outside the spring container | We can’t create bean if class is outside spring container |
3 | Class/Method Level Annotation | It is a method level annotation | It is a class level annotation |
4 | @Configuration | It works only when class is also annotated with @Configuration | It works without @Configuration annotation |
5 | Use Case | We should use @bean, if you want specific implementation based on dynamic condition. | We can’t write specific implementation based on dynamic condition |
Example of @Component
@Component public class Pizza{ ........ }
Example of @Bean
@Configuration class AppConfiguration{ @Bean public User getUse(){ return new User(); } }
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