if (value == null) { value = ""; }
    public boolean stopProxy(String key) {        Listener l = (Listener) _listeners.remove(key);        if (l != null && l.stop()) {            _prop.remove("Proxy.listener." + key + ".base");            _prop.remove("Proxy.listener." + key + ".useplugins");            String value = null;            Iterator i = _listeners.keySet().iterator();            while (i.hasNext()) {                key = (String) i.next();                if (value == null) {                    value = key;                } else {                    value = value + ", " + key;                }            }            _prop.setProperty("Proxy.listeners", value);            return true;        } else {            return false;        }    }