Local ArrayList<RequestHook> is created in the method RequestEngine.addHooks. Elements are added to it, but then content is unused. Seems leftovers from some refactoring.

    static void addHooks(List<RequestHook> newEntries) {
        List<RequestHook> addEntries = new ArrayList<>();
        for (RequestHook rh : newEntries) {
            rh.type.setEventHook(true);
            addEntries.add(rh);
            logHook("Added", rh.type);
        }
        entries.addAll(newEntries);
    }