String a = (String) s.getChildItem(Signal.PREDICATE);
String a = (String) s.getChild(Signal.PREDICATE);
    public void handle(Signal s, Boolean b) throws Exception {        super.handle(s, b);        if (s != null) {            String a = (String) s.getChildItem(Signal.PREDICATE);            if (a != null) {                if (a.isEqualTo(ShutdownSocket.SHUTDOWN_SYSTEM_ACTION)) {                    shutdownSystem();                }            } else {                throw new Exception("Could not handle signal. The action is null.");            }        } else {            throw new Exception("Could not handle signal. The signal is null.");        }    }