/** The key of the configuration. e.g. ou=People,dc=fess,dc=codelibs,dc=org */
    String LDAP_ADMIN_USER_BASE_DN = "ldap.admin.user.base.dn";

    /** The key of the configuration. e.g. organizationalPerson,top,person,inetOrgPerson */
    String LDAP_ADMIN_USER_OBJECT_CLASSES = "ldap.admin.user.object.classes";

    /** The key of the configuration. e.g. cn=%s */
    String LDAP_ADMIN_ROLE_FILTER = "ldap.admin.role.filter";

        return APP_TYPE;
    }

    @Override
    protected OptionalThing<String> myUserType() { // for framework
        return OptionalThing.of(USER_TYPE); // same reason as getUserBean()
    }

    // ===================================================================================
    //                                                                          Validation

                            if (auth.isDebugActive() && StringUtil.isNotBlank(auth.getLastErrorReason())) {
                                logger.warn("Authentication Failure: {} - Reason: {}", errors.stream().collect(Collectors.joining(", ")),
                                        auth.getLastErrorReason());
                            } else {