public boolean isDisabled() {
        return disabled;
    }
Returns whether this user account has been disabled. The credentials of
disabled user accounts are treated as invalid, effectively disabling
that user's access to data for which they would otherwise have
permission.

@return
    true if this user account is disabled, false otherwise.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/user/UserModel.java