Firebase “User is missing a constructor with no arguments”

Question

I am trying to retrieve my user details from the /User/ tree i have in Firebase. I have the following User object :

public class User {
    private String          


        

Answer 1

You must be getting this error because your User class is a sub class.

Solution:

Either mark your class static:

 public class SomeParentClass{ 

        public static class User {
            ....
        }
    }

or create it in a separate file.