There is currently no way to associate a cred generated by native provider with a Subject whose creds can later can be used implicitly during JGSS context establishment. If possible, we should provide a way to facilitate this.
When native provider constructs the delegated cred using the cred handle returned by the native GSS library, it should inquire the cred name through another native GSS API, so the resulting delegated cred would have proper (meaningful) name and not null.