public boolean isExpired() {
        return getModel().isExpired();
    }
Returns whether this user's password has expired. If a user's password
is expired, it must be immediately changed upon login. A user account
with an expired password cannot be used until the password has been
changed.

@return
    true if this user's password has expired, false otherwise.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/user/ModeledUser.java