Currently Spring Boot has it's own version of DynamicValuesPropertySource called TestcontainersPropertySource. This class is testcontainers specific and includes some extra functionality, but the basic logic for the core methods is copy/paste from the package-private framework class.

Recently @rwinch has started to reuse TestcontainersPropertySource in the spring-boot-testjars experimental project. This isn't ideal since that project should not depend on spring-boot-testcontainers. We can't move TestcontainersPropertySource and there isn't a good home in Spring Boot to create another public variant so we wondered if the Spring Framework class should be made public instead?

The alternative is to copy/paste the code again into spring-boot-testjars.