I'm successfully created user with email from android without any problem but after I downloaded the standard java library and tried to make user I get no error or feedback for error or success in callback
public static void main(String ...args){
    String url= "https://example.firebaseio.com/";
    Firebase fb = new Firebase(url);
    fb.createUser("example@gmail.com", "123456", new Firebase.ResultHandler() {
        @Override
        public void onSuccess() {
            System.out.println("success");
        }
        @Override
        public void onError(FirebaseError firebaseError) {
            System.out.println("failed !");
        }
    });
    System.out.println("Hello there");
}
 
     
    