PLAY - REST with JAVA - basic GET request

Question

I use play framework for my server-side with the reast api and java for the actual server-side functions. I'm trying to make a simple GET request, to get Array of Json. But it gives me an error in the Users when I use Json.toJson. why is that ??

the User is a simple class for the user object( "user name:, password:, first name: ,last name").

public class Users extends Controller {
    private static ArrayList<User> Users = new ArrayList(){{
        add(new User("a","2","a","a"));
    }};
    public static Result index(){
        return ok(Json.toJson(Users)); 
    }
}

edit 1 - the answer:

my problem was that I imported the wrong java lib for the play Result . the right one is :

import play.mvc.Result;

Answer 1

my problem was that I imported the wrong java lib for the play Result . the right one is :

import play.mvc.Result;