Across builds much more on top of Spring Framework than on Spring Boot. Across applications execute as a Spring Boot application and use some features provided by Spring Boot (like embedded webserver, YAML configuration and devtools).
Auto-configuration, however, is not supported, which means simply adding a starter to your project will not be enough. Many available configuration classes from Spring Boot will also not work in an Across application, because they are setup for a single
ApplicationContext, whereas Across uses a different hierarchy.
See the across-autoconfigure documentation for the list of supported starters, and more information on how to make others compatible.
There is often no actual limitation to using the starter libraries, but some effort might be required to get the right configuration. We can offer commercial support for this if required.