I added a Spring Boot starter to my project, but it's not added to the application.

The current version of Across does not support all Spring Boot starters. 

Because a default Spring Boot application and an Across application are fundamentally different in setup, the configuration might not work out of the box. Increasing compatibility with auto-configuration is a major point for future releases of Across.

See the separate across-autoconfigure documentation for details on which starters are currently supported and how you can make others compatible.