https://tomcat.apache.org/tomcat-9.0-doc/api/org/apache/catalina/realm/UserDatabaseRealm.UserDatabasePrincipal.html
UserDatabaseRealm.UserDatabasePrincipal (Apache Tomcat 9.0.118 API Documentation)
declaration: package: org.apache.catalina.realm, class: UserDatabaseRealm, class: UserDatabasePrincipal
apache tomcatapidocumentation