@SpringBootApplication

@SpringBootApplication 어노테이션에 대해서 간단히 알아보자

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ExampleApplication {

    public static void main(String[] args) {
        SpringApplication.run(ExampleApplication.class, args);
    }

}

내부를 살펴보면

• @SpringBootConfiguration
• @EnableAutoConfiguration
• @ComponentScan 을 포함하고 있다.

스프링 부트의 main 메서드는 @SpringBootApplication 어노테이션을 가지고 있는데 이것은
ComponentScan + configuraion + EnableAutoConfiguration를 합친 어노테이션 이라볼 수 있다.

@Target(value = {ElementType.TYPE})
@Retention(value = RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(excludeFilters = {
    @ComponentScan.Filter(type = FilterType.CUSTOM, classes = {TypeExcludeFilter.class}),
    @ComponentScan.Filter(type = FilterType.CUSTOM, classes = {AutoConfigurationExcludeFilter.class})})
public @interface SpringBootApplication {

    @AliasFor(annotation = EnableAutoConfiguration.class)
    public Class<?>[] exclude() default {};

    @AliasFor(annotation = EnableAutoConfiguration.class)
    public String[] excludeName() default {};

    @AliasFor(annotation = ComponentScan.class, attribute = "basePackages")
    public String[] scanBasePackages() default {};

    @AliasFor(annotation = ComponentScan.class, attribute = "basePackageClasses")
    public Class<?>[] scanBasePackageClasses() default {};

    @AliasFor(annotation = ComponentScan.class, attribute = "nameGenerator")
    public Class<? extends BeanNameGenerator> nameGenerator() default BeanNameGenerator.class;

    @AliasFor(annotation = Configuration.class)
    public boolean proxyBeanMethods() default true;
}