Spring Initializr adds the @SpringBootApplication annotation to our main class. @SpringBootApplication is a convenience annotation that adds all of the following:
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@Configuration: Tags the class as a source of bean definitions for the application context. -
@EnableAutoConfiguration: Spring Boot attempts to automatically configure your Spring application based on the dependencies that you have added. -
@ComponentScan: Tells Spring to look for other components, configurations, and services. If specific packages are not defined, recursive scanning begins with the package of the class that declares the annotation.