collectors

LinkedHashMap<String, LinkedHashMap<String, ArrayList<Commit>>> test = gitUsers.entrySet()
                .stream()
                .sorted((u1, u2) -> collator.compare(u1.getKey(), u2.getKey()))
                .map(u -> u.getValue().entrySet()
                        .stream()
                        .sorted((r1, r2) -> collator.compare(r1.getKey(), r2.getKey())))
                        .collect(Collectors.toMap(Map.Entry::getKey,Map.Entry::getValue,(a,b) -> a,LinkedHashMap::new));