Spring Java Based Configuration

Spring - Java Based Configuration

@Configuration & @Bean Annotations

Annotating a class with the @Configuration indicates that the class can be used by the Spring IoC container as a source of bean definitions. The @Bean annotation tells Spring that a method annotated with @Bean will return an object that should be registered as a bean in the Spring application context. The simplest possible **@Configuration **class would be as follows

@Configuration
public class HelloWorldConfig {
   @Bean 
   public HelloWorld helloWorld(){
      return new HelloWorld();
   }
}

@Import Annotation

The @Import annotation allows for loading @Bean definitions from another configuration class. Consider a ConfigA class as follows

@Configuration
public class ConfigA {
   @Bean
   public A a() {
      return new A(); 
   }
}
@Configuration
@Import(ConfigA.class)
public class ConfigB {
   @Bean
   public B a() {
      return new A(); 
   }
}

Reference

• https://www.tutorialspoint.com/spring/spring_java_based_configuration.htm