Hello everyone, in this article we will see how spring boot auto configurations.

• • In Spring boot, all the configuration becomes automatic, automatic means that we only have to add the dependency, After that Spring boot will automatically configure as per the dependency.
• • Earlier we had to do programmatic configuration in spring.
• • Now Spring boot developers have given all the configuration in writing in Spring boot , we do not have to do programmatic configuration.
• • Configuration depending up on our dependencies or technologies.
• • Here all the work is done with pom starter.

Starter POM (Project Object Model)

• • Spring-boot-starter-web
• • Spring-boot-starter-data-jpa
• • Others….

When we add starter jars then it pull all the jars with the help up Maven.

• • spring.factories file have all Auto-configurations on disable mode.
• • This Configuration will enable happen under certain conditions.
• • What should be enabled or disable based on some conditions.
• • Condition means dependency whenever we add the dependency, that configuration will be enabled at that time.
• • First it will check the class path and then do the configuration according to the class path.
• • All configuration classed declare in spring.factories.

In pom.xml file we need to add dependencies

Dependency look like this which is shown in below which is shown in the following figure.

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

After adding dependency in pom.xml file maven automatically downloard jar files, which is show in the following figure.