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component scanning in spring

Innocent Iguana answered on February 20, 2024 Popularity 10/10 Helpfulness 3/10

answer component scanning in spring

component scanning in spring

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- Start Component Scanning
    - `@SpringBootApplication`, for automatic scanning in Spring Boot
    - For Spring, it can be with `@ComponentScan(basePackages = "com.yourpackage.package")` in ApplicationConfig.java
    - Requires java or xml configuration for Spring
    - Base package should be defined for component scanning
    - Scanning occurs during startup
    - 
- Helps to find the beans, services etc in the package
- `@Component` : indicates that a class should be loaded in the bean factory
- `@Service` : Stereotype of `@Component` that indicates that this class is a service
- helps to scan base packages and the subpackages inside the base package 
- Loads configuration automatically for each bean it finds and helps IoC container to build the dependency graph
- `@Autowired` helps the IoC container to inject the beans for dependency injection to the places where injection is required.
- Best practices:
    - Avoid using `@Autowired` on class attributes for testing purpose
    - If dependency is required, use it on constructor
    - If dependency is not required / optional , use it on setter
- `@Qualifier` with a version name is used for injection if there are more than one beans of same type (NOT RECOMMENDED)
- `@Value` is used to inject properties or constants. that property is not required in constructor if it is injected inside the specified class instead of configuration class

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Source: Grepper

Tags: spring whatever

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Contributed on Feb 20 2024

Innocent Iguana

0 Answers Avg Quality 2/10

component scanning in spring

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