It will be nice if the https://docs.oracle.com/en/java/javase/19/security/accessing-native-gss-api.html page can mention this system property. It can be similar to the Note at the end of https://docs.oracle.com/en/java/javase/19/security/troubleshooting.html. Something like:

Note: A debugging mode can be enabled by setting the system property `sun.security.nativegss.debug` to "true". This setting allows you to follow the program's native GSS-API calls.