Spring profiles let developers configure their applications to behave differently in various environments. Most Spring profile configurations occur in the application.properties (or YAML) file.

We’ll use Spring Boot to create an example project, which we’ll use to demo Spring features. Spring Boot makes starting new projects much easier, as you’ll see for yourself.

The Spring Boot @ConfigurationProperties simplifies the use of the application.properties file, easing the creation of lists, maps and inner classes.