Starters are an integral part of the Spring Boot application. In addition to dependency versioning, they provide the ability to describe the configuration for a particular functionality. They gained their popularity due to the development of microservice architecture. When we have dozens or hundreds of services within one application, some of the functionality is not duplicated. For example, we need to connect the cache, database, logging etc. In order not to duplicate the same configuration every time, we simply add the starter as a dependency to our microservice, and Spring recognizes all our configurations.
We will try to create our own simple starter on Spring Boot 3. There have been some changes in it compared to the second version. Our starter will have the simplest functionality, namely to output a message to the console when our application starts. We create a project through spring initializer, which we will call according to the custom-spring-boot-starter convention