class User {
   Long id;
   String username;
   String password;
   boolean active;

   String getUsername() {
   }

   boolean isNew() {
     return id != null;
   }

   boolean isActive() {
     return active;
   }
}

{
  username: "foo",
  active: true, // or would it be isActive, can't remember
}

{
  username: "bar",
  active: false, // or would it be isActive, can't remember
  password: "password1"
}