public void writeExternal(ObjectOutput out) throws IOException {
            super.writeExternal(out);
            ExternalizableUtil.getInstance().writeSerializable(out, (DefaultElement) presence.getElement());
        }
Surrogate for client sessions hosted in some remote cluster node.

@author Gaston Dombiak
xmppserver/src/main/java/org/jivesoftware/openfire/session/RemoteClientSession.java