public void writeExternal(ObjectOutput out) throws IOException {
        super.writeExternal(out);
        ExternalizableUtil.getInstance().writeSerializable(out, domainPair);
    }
Class that defines possible remote operations that could be performed
on remote outgoing server sessions.

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