When I try to build the application via Maven mvn install, it says

java.lang.IllegalArgumentException: Could not resolve placeholder 'example_token' in value "${example_token}"

I assume it happens because the example_token does not exist in application.yml, it is both in application-dev.yml and application-prod.yml though.

The idea is to build one single WAR archive of the Maven application and switch the profiles according to the environment variables (SPRING_PROFILES_ACTIVE=dev/SPRING_PROFILES_ACTIVE=prod), for example. What is the best practice way to build a project via Maven to achieve this? One of the ways to solve this is to make mocked properties I suppose but I don’t think it’s a good approach.
I am thinking of linking Maven and Spring Boot profiles but still I am not sure how to properly create WAR archive because of the mentioned error.

I have two Spring Boot application profiles with three correspondent YAML files: application.yml, application-dev.yml and application-prod.yml. When I run the application locally from the Idea with, for instance, dev active profile, everything works great.

I am using Spring-boot 3.0.13 and Maven 3.9.5