your last commit is error

[kqjhuang]

public void buildMap(){
    for(int i=1; i<raw.size()+1; i+=2){
        byte[] k = raw.get(i);
        byte[] v = raw.get(i+1);
        keys.add(k);
        items.put(k, v);
    }
}

i think you should use i<raw.size() or i<raw.size()-1

[ideawu]

Yes, you are right. I have just fixed it.