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spring annotations list

Innocent Iguana answered on March 24, 2024 Popularity 9/10 Helpfulness 4/10

answer spring annotations list

spring annotations list

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- Why use these when we already have `@Component`:
    - Use special behaviors that are provided by these stereotypes
    - Letting the framework know the utilization intention
- `@Service` : When the class has business logic
- `@Controller` : When the class is acting as web controller
- `@Repository` : When the class is solely used for dealing with retrieving data from database
- `@Bean`: When a method returns a spring bean of a class
- `@Configuration` : When a class has the information about beans (eg: has `@Bean` methods)
- `@ComponentScan` : Searches for `@Component` or it's stereotypes in a given package to do the wiring/connection. Default package is where this file is located
- `@Primary`  : Set top priority for a given dependency when there are multiple dependencies of same type are present for auto-wiring
- `@Qualifier` : Set priority qualifying name for a given dependency when there are multiple dependencies of same type are present for auto-wiring
- `@Lazy` : Making beans of a class lazy
- `@Scope("singleton")` : Create only one bean instance of a class for all calls
    - Also used as `@Scope(value=ConfigurableBeanFactory.SCOPE_PROTOTYPE)`
- `@Scope("prototype")` : Create new bean instance for each call
    - Also used as `@Scope(value=ConfigurableBeanFactory.SCOPE_PROTOTYPE)`
- `@PostConstruct` : Used on method that will be executed after dependency injection is done to perform any initialization
- `@PreDestroy` : Used on method that will be executed before being removed by IoC. Used to release (teardown) the allocated resources.
- `@Named` : Jakarta Context and Dependency Injection (CDI) annotation similar to `@Component`
- `@Inject` : Jakarta Context and Dependency Injection (CDI) annotation similar to `@Autowired`

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Contributed on Mar 24 2024

Innocent Iguana

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