final Map<Integer, User> users = new HashMap<Integer, User>();
public UserServiceImpl() {
int u1id = users.size();
User userOne = new User(u1id);
userOne.name = "John";
userOne.familyName = "Fassbinder";
userOne.age = 12;
userOne.avatar = "1.jpg";
users.put(u1id, userOne);
int u2id = users.size();
User userTwo = new User(u2id);
userTwo.name = "Bruce";
userTwo.familyName = "Lee";
userTwo.age = 27;
userTwo.avatar = "lee.jpg";
users.put(u2id, userTwo);
int u3id = users.size();
User userThree = new User(u3id);
userThree.name = "Chuck";
userThree.familyName = "Boo";
userThree.age = 37;
userThree.avatar = "484930.png";
users.put(u3id, userThree);