
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
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(); } }
Advertisements