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@Configuration Annotation Overview
Importing Additional Configuration Classes
You need not put all your @Configuration into a single class. The @Import annotation can be used to import additional configuration classes. Alternatively, you can use @ComponentScan to automatically pick up all Spring components, including @Configuration classes.Read more about @Import annotation on Spring @Import Annotation with Example
Refer below diagram shows an internal implementation for your reference:
@Configuration Annotation Example
import org.springframework.boot.SpringApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.companyname.projectname.customer.CustomerService;
import com.companyname.projectname.order.OrderService;
@Configuration
public class Application {
@Bean
public CustomerService customerService() {
return new CustomerService();
}
@Bean
public OrderService orderService() {
return new OrderService();
}
}
<beans>
<bean id="customerService" class="com.companyname.projectname.CustomerService"/>
<bean id="orderService" class="com.companyname.projectname.OrderService"/>
</beans>
Injecting inter-bean dependencies
When @Bean have dependencies on one another, expressing that dependency is as simple as having one bean method call another:@Configuration
public class AppConfig {
@Bean
public Foo foo() {
return new Foo(bar());
}
@Bean
public Bar bar() {
return new Bar();
}
}
Related Spring and Spring Boot Annotations
- Spring Boot @Bean Annotation Example
- Spring @Qualifier Annotation Example
- Spring @Autowired Annotation with Example
- Spring @Bean Annotation with Example
- Spring @Configuration Annotation with Example
- Spring @PropertySource Annotation with Example
- Spring @Import Annotation with Example
- Spring @ImportResource Annotation Example
- Spring - @Lazy Annotation Example
- Spring - @Primary Annotation Example
- Spring @PostConstruct and @PreDestroy Example
- Spring @Repository Annotation
- Spring @Service Annotation
- The Spring @Controller and @RestController Annotations
- Spring Boot @Component, @Controller, @Repository and @Service
- Spring @Scope annotation with Prototype Scope Example
- Spring @Scope annotation with Singleton Scope Example
- Spring Boot @PathVariable
- Spring Boot @ResponseBody
- Spring @RequestBody - Binding Method Parameters to Request Body
- Spring Boot @ResponseStatus Annotation
- Spring Boot - Creating Asynchronous Methods using @Async Annotation
- @SpringBootTest Spring Boot Example
- @SpringBootTest vs @WebMvcTest
- @DataJpaTest Spring Boot Example
- Spring @PostConstruct and @PreDestroy Example
- Spring @GetMapping, @PostMapping, @PutMapping, @DeleteMapping and @PatchMapping
- Spring Boot @EnableAutoConfiguration Annotation with Example
- Spring Boot @SpringBootApplication Annotation with Example
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