The Spring Boot configuration

In this section, the focus will be on the configuration aspects of Spring Boot. The chapter2.bootrest project, already developed, will be modified in this section to showcase configuration capabilities. Copy and paste chapter2.bootrest and rename the project as chapter2.boot-advanced.

Understanding the Spring Boot autoconfiguration

Spring Boot uses convention over configuration by scanning the dependent libraries available in the class path. For each spring-boot-starter-* dependency in the POM file, Spring Boot executes a default AutoConfiguration class. AutoConfiguration classes use the *AutoConfiguration lexical pattern, where * represents the library. For example, the autoconfiguration of JPA repositories is done through JpaRepositoriesAutoConfiguration.

Run the application with --debug to see the autoconfiguration report. The following command shows the autoconfiguration report for the chapter2.boot-advanced project:

$java -jar target/bootadvanced-0.0.1-SNAPSHOT...