The SpringApplication class is used to bootstrap our application. We've used it in the previous recipes; we will see how to create the Application class for Spring Boot in this recipe.
We will be using IntelliJ IDE for coding purposes. To set up the environment, read previous recipes, especially the Setting up dependencies for building RESTful services recipe.
If you've used Spring Boot before, you must be familiar with using @Configuration, @EnableAutoConfiguration, and @ComponentScan in your main class. These were used so frequently that Spring Boot provides a convenient @SpringBootApplication alternative. The Spring Boot looks for the public static main method, and we will use a top-level function outside the Application class.
If you noted, while setting up the dependencies, we used the kotlin-spring plugin, hence we don't need to make the Application class open.
Here's an example of the Spring Boot application:
package...