Gson showing nested Object as null

Question

Im trying to deserialize objects into JSON, one object contains a nested object. I created an instance of both the nested object (UserAddress)and the one containing it (UserObjectWithNestedObject). However, when I serialize, the nested object is null. So I ran the program in debugger mode to see when it goes null.

It seems to be null when I use it as a field when instantiating the UserObjectWithNestedObject class but I dont know why because I instantiated in the objects in the same scope so you'd think the they would be able to communicate with no issue

Sorry, you might need to zoom

My classes

Main

import com.google.gson.Gson;
import java.util.ArrayList;
import java.util.List;

 public class Main {

    public static void main(String[] args) {

        serializeUserObjectWithNestedObject();
    }

    public static void serializeUserObjectWithNestedObject(){

        UserAddress userAddress = new UserAddress(
                "std",
                "000",
                "Dulin",
                "Ireland"
        );

        UserObjectWithNestedObject uowno= new UserObjectWithNestedObject(

                "thanss",
                "[email protected]",
                21,
                true,
                userAddress
        );

        System.out.println( "\nthis is the UserAddress object "+userAddress);

        String theJson = new Gson().toJson(uowno, UserObjectWithNestedObject.class);

        System.out.println(theJson);
    }

}

UserObjectWithNestedObject

public class UserObjectWithNestedObject {

    private String name;
    private String email;
    private int age;
    private boolean isDeveloper;

    //This is the object inside this object
    public UserAddress userAddress;

    public UserObjectWithNestedObject(String name, String email, int age, boolean isDeveloper, UserAddress userAddress) {
        this.name = name;
        this.email = email;
        this.age = age;
        this.isDeveloper = isDeveloper;
    }

    @Override
    public String toString() {
        return "UserObjectWithNestedObject{" +
                "name='" + name + '\'' +
                ", email='" + email + '\'' +
                ", age=" + age +
                ", isDeveloper=" + isDeveloper +
                ", userAddress=" + userAddress +
                '}';
    }
}

UserAddress (this is the nested object that turns null)

public class UserAddress {

    private String street;
    private String houseNumber;
    private String city;
    private String country;

    public UserAddress( String houseNumber, String city, String country, String street) {
        this.houseNumber = houseNumber;
        this.city = city;
        this.country = country;
        this.street = street;

    }

    public String getStreet() {
        return street;
    }

    public void setStreet(String street) {
        this.street = street;
    }

    public String getHouseNumber() {
        return houseNumber;
    }

    public void setHouseNumber(String houseNumber) {
        this.houseNumber = houseNumber;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    @Override
    public String toString() {
        return "UserAddress{" +
                "street='" + street + '\'' +
                ", houseNumber='" + houseNumber + '\'' +
                ", city='" + city + '\'' +
                ", country='" + country + '\'' +
                '}';
    }
}

Answer 1

You did not initialize it :)

public UserObjectWithNestedObject(String name, String email, int age, boolean isDeveloper, UserAddress userAddress) {
    this.name = name;
    this.email = email;
    this.age = age;
    this.isDeveloper = isDeveloper;
    this.userAddress = userAddress;
}