Explain the @SpringBootApplication annotation.

@SpringBootApplication is a convenience annotation that combines three annotations. One line on the main class registers your configuration and turns on auto-configuration and component scanning.

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

It is equivalent to:

• @SpringBootConfiguration: marks the class as a source of beans. It is a specialized @Configuration that also helps tests find your configuration.
• @EnableAutoConfiguration: turns on auto-configuration, which creates beans from the libraries on the classpath.
• @ComponentScan: scans the current package and its sub-packages for components.

Scanning starts at the package of this class, so put the main class in a root package above your other classes.