Configuring our application

When we create a Spring Boot application, we may need to use configuration values, things that we want to externalize from the application code itself, or that we may want to change without affecting the main code.

First, we will make some changes in our service and review the different methods to configure the application. Then, we will understand what Spring Expression Language is, and how we can use application profiles. Finally, we will apply our knowledge of configuration to create some conditional beans.

Setting configuration values

There is a time in any application that we may need to have a configurable value, something that we can define outside our main code and that can easily change...