In order to prepare for the existing API at https://spring.io/api to go away sometime soon, we decided to realize the following changes for the upcoming 4.17.0 (that we currently use to validate versions and generations of Spring Boot projects):

• remove the generations validation from the 4.17.0 release. This will be included again in the 4.17.1 release, based on the new API.
• switch the versions validation to pull version information from maven central instead of the old API.

If possible, we might even query the configured repositories on the projects for the available versions. This would have the benefit of being precise about the available Spring Boot versions in the environment of the user - instead of showing which versions are available in general. But that depends on the amount of work that is necessary to implement this part.