@Override
    public void printStackTrace() {
        super.printStackTrace();
        if (nestedThrowable != null) {
            nestedThrowable.printStackTrace();
        }
    }
Exception used for representing that the user can't join a room since it's been locked. A 404 
error code is returned to the user that requested the invalid operation.

@author Gaston Dombiak
xmppserver/src/main/java/org/jivesoftware/openfire/muc/RoomLockedException.java