Where in Spring Boot are the automatically managed configurations located?

In Spring Boot, auto-managed configurations are located in the auto-configuration module, which is usually found in packages annotated with @EnableAutoConfiguration.

Auto-configuration is implemented in classes annotated with @Configuration, which are automatically loaded at application startup if certain libraries are present in the classpath and no user-defined beans override the behavior.

These settings can be found in the Spring Boot source code in the package org.springframework.boot.autoconfigure.

For example, if spring-boot-starter-web is in the classpath, configuration for the web server and MVC will be automatically enabled.