[[using.configuration-classes]]
== Configuration Classes
Spring Boot favors Java-based configuration.
Although it is possible to use `SpringApplication` with XML sources, we generally recommend that your primary source be a single `@Configuration` class.
Usually the class that defines the `main` method is a good candidate as the primary `@Configuration`.

TIP: Many Spring configuration examples have been published on the Internet that use XML configuration.
If possible, always try to use the equivalent Java-based configuration.
Searching for `+Enable*+` annotations can be a good starting point.



[[using.configuration-classes.importing-additional-configuration]]
=== Importing Additional Configuration Classes
You need not put all your `@Configuration` into a single class.
The `@Import` annotation can be used to import additional configuration classes.
Alternatively, you can use `@ComponentScan` to automatically pick up all Spring components, including `@Configuration` classes.



[[using.configuration-classes.importing-xml-configuration]]
=== Importing XML Configuration
If you absolutely must use XML based configuration, we recommend that you still start with a `@Configuration` class.
You can then use an `@ImportResource` annotation to load XML configuration files.