documentation/manual/working/javaGuide/advanced/routing/code/javaguide/binder/models/User.java
private User findById(Long id) {
    if (id > 3) return null;
    User user = new User();
    user.id = id;
    user.name = "User " + String.valueOf(id);
    return user;
  }
private User findById(Long id) {
    if (id > 3) return null;
    User user = new User();
    user.id = id;
    user.name = "User " + String.valueOf(id);
    return user;
  }
designed to be lightweight operation