[[using.using-the-springbootapplication-annotation]]
== Using the @SpringBootApplication Annotation
Many Spring Boot developers like their apps to use auto-configuration, component scan and be able to define extra configuration on their "application class".
A single `@SpringBootApplication` annotation can be used to enable those three features, that is:

* `@EnableAutoConfiguration`: enable <<using#using.auto-configuration,Spring Boot's auto-configuration mechanism>>
* `@ComponentScan`: enable `@Component` scan on the package where the application is located (see <<using#using.structuring-your-code,the best practices>>)
* `@Configuration`: allow to register extra beans in the context or import additional configuration classes

[source,java,indent=0,subs="verbatim"]
----
include::{docs-java}/using/usingthespringbootapplicationannotation/springapplication/MyApplication.java[]
----

NOTE: `@SpringBootApplication` also provides aliases to customize the attributes of `@EnableAutoConfiguration` and `@ComponentScan`.

[NOTE]
====
None of these features are mandatory and you may choose to replace this single annotation by any of the features that it enables.
For instance, you may not want to use component scan or configuration properties scan in your application:

[source,java,indent=0,subs="verbatim"]
----
include::{docs-java}/using/usingthespringbootapplicationannotation/individualannotations/MyApplication.java[]
----

In this example, `Application` is just like any other Spring Boot application except that `@Component`-annotated classes and `@ConfigurationProperties`-annotated classes are not detected automatically and the user-defined beans are imported explicitly (see `@Import`).
====
