Create a RestSampleApp class using the SpringBootApplication annotation. The main() method uses Spring Boot's SpringApplication.run() method to launch an application.

We will annotate the RestSampleApp class with the @SpringBootApplication annotation that adds all of the following tags implicitly:

The @Configuration annotation tags the class as a source of bean definitions for the application context.

The @EnableAutoConfiguration annotation indicates that Spring Boot is to start adding beans based on classpath settings, other beans, and various property settings.

The @EnableWebMvc annotation is added if Spring Boot finds spring-webmvc on the classpath. It treats the application as a web application and activates key behaviors, such as setting up DispatcherServlet.

The @ComponentScan annotation tells Spring to look for other components, configurations, and services in the given package: