@Override
    public void connectionRemoved(Server server, HostedConnection hc) {
        if( log.isLoggable(Level.FINEST) ) {
            log.log(Level.FINEST, "connectionRemoved({0}, {1})", new Object[]{server, hc});
        }    
        stopHostingOnConnection(hc);
    }
Called internally when an existing connection is leaving
 the server.  This method always calls stopHostingOnConnection(hc).
 Implementations should be aware that if they stopHostingOnConnection()
 early that they will get a second call when the connection goes away.
jme3-networking/src/main/java/com/jme3/network/service/AbstractHostedConnectionService.java