Creating an application object

The @SpringBootApplication annotation provides a convenient way to bootstrap a Spring application that can be started from a main() method. In many situations, you can just delegate to the static runApplication method:

@SpringBootApplication
class Chapter2Application

fun main(args: Array<String>) {
    runApplication<Chapter2Application>(*args)
}

You can see that we have used the @SpringBootApplication annotation for marking a class that we will use as our application context. We will learn more about the Spring Application Context shortly.

When a Spring Boot application starts it will autoconfigure all the required systems; if it is a web app, it will start a web application.

The application will also configure and run any other system that we need, such as a connection pool to a database or a queue.