Before CAP Java 3.0, XSUAA token validation lived in its own cds-feature-xsuaa module, separate from IAS support. The 3.0 release removed cds-feature-xsuaa and unified XSUAA and IAS behind cds-feature-identity, the module that now provides both.
Guidance to add cds-feature-xsuaa as a Maven dependency for authentication in a CAP Java project. It was removed in the 3.0 line, mid-2024 — cds-feature-identity is the replacement for XSUAA as well as IAS.