GSon not serializing properly with inheritance

Question

I am a newbie to Gson library, not sure why this object to json converter works weird. I have code something similar to the below

public class A implements Serializable{
    @Expose
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}

public class B extends A implements Serializable{
    @Expose
    private int x;

    public int getX() {
        return x;
    }

    public void setX(int x) {
        this.x = x;
    }
}

 public class MainclassTester{
    public static void main(String[] args){
    public B b = new B();
    b.setName("Point");
    b.setX(2);
    final Gson gson = new GsonBuilder().create();
    System.out.println(gson.toJson(b));

   }
 }

I want the output to be something like this

{
"name":'Point',
 "x":2
}

but I get the output

{
 "name":'Point'
 }

My subclass variables are not serialized properly.

check this out http://stackoverflow.com/questions/19588020/gson-serialize-a-list-of-polymorphic-objects/22081826#22081826 — Chakradhar Vyza, Jul 26 '16 at 08:32
which version are you using:??? wih gson 2.7 is working fine! — ΦXocę 웃 Пepeúpa ツ, Jul 26 '16 at 08:51
Tried 2.6.2 and working fine, btw, you don't use `public` for variable inside a method: `public B b = new B();` — shizhz, Apr 04 '17 at 02:23

score 0 · Answer 1 · edited Oct 02 '17 at 20:29

0

You need annotate your class with expose, just for field to be exposed. So do you need erase expose before private int x;.

To supress a field it is necessary to instantiate a Gson with a excludeFieldsWithoutExposeAnnotation modifier.

GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();

edited Oct 02 '17 at 20:29

John F. Miller

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answered Oct 02 '17 at 19:36

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GSon not serializing properly with inheritance

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