String sub = (String) s.getChildItem(Signal.SUBJECT);
String sub = (String) s.getChild(Signal.SUBJECT);
    public void handle(Signal s, Boolean b) throws Exception {        if (s != null) {                        String sub = (String) s.getChildItem(Signal.SUBJECT);            if (sub != null) {                if (sub.isEqualTo(getName())) {                    log(System.DEBUG_LOG_LEVEL, "Handle signal in super class.");                    super.handle(s, b);                } else {                    Integer count = (Integer) getChildItem(Family.SYSTEMS_COUNT);                    if (count != null) {                        String str = null;                        System sys = null;                        int i = 0;//??                        while (i < count.getJavaPrimitive()) {                            //?? Delete this line later and use the one below!                            str = Family.SYSTEM;                            //?? When more modules are used, use the following line!                            //?? To be implemented yet.//??                            str = new String(Family.SYSTEM.getJavaObject() + "_" + java.lang.String.valueOf(i));                            if (sub.isEqualTo(str)) {                                sys = (System) getSystem(str);                                    if (sys != null) {                                    log(System.DEBUG_LOG_LEVEL, "Handle signal in system " + sys);                                    sys.handle(s, b);                                                } else {                                    throw new Exception("Could not handle signal. A system is null.");                                }                                //??                                break;                            }                            i++;//??                        }                    } else {                        throw new Exception("Could not handle signal. The systems count is null.");                    }                }            } else {                throw new Exception("Could not handle signal. The subject is null.");            }        } else {            throw new Exception("Could not handle signal. The signal is null.");        }    }