How do you configure the startup class in Spring Boot?

In Spring Boot, setting up the main class is very easy – just add the @SpringBootApplication annotation to the main class.

The sample code is provided below:

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

@SpringBootApplication
public class DemoApplication {

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

In the above code, the @SpringBootApplication annotation is a combination annotation that combines the functionalities of @EnableAutoConfiguration, @ComponentScan, and @Configuration annotations. It automatically configures, scans components, and marks the main class as a configuration class.

The SpringApplication.run(DemoApplication.class, args) method is used to start the application. It takes two parameters – the first parameter is the Class object of the startup class, and the second parameter is the runtime arguments, usually args.