Json parsing with gson returns null object

Question

I am parsing a Json string via gson , this is the Json string

[
{
    \"ID\": 1,
    \"Name\": \"Australia\",
    \"Active\": true
},
{
    \"ID\": 3,
    \"         


        

Answer 1

Names of the fields in your MyBranch class don't match to the fields in your json so you have to use SerializedName annotation.

import com.google.gson.annotations.SerializedName;

public class MyBranch extends Entity {
    public MyBranch () {
        super();
    }

    public MyBranch (int id, String name, String isActive) {
        super();
        _ID = id;
        _Name = name;
        _Active = isActive;
    }

    @Column(name = "id", primaryKey = true)
    @SerializedName("ID")
    public int _ID;

    @SerializedName("Name")
    public String _Name;

    @SerializedName("Active")
    public String _Active;
}

EDIT: You can also avoid using SerializedName annotation by simple renaming MyBranch fields:

import com.google.gson.annotations.SerializedName;

public class MyBranch extends Entity {
    public MyBranch () {
        super();
    }

    public MyBranch (int id, String name, String isActive) {
        super();
        ID = id;
        Name = name;
        Active = isActive;
    }

    @Column(name = "id", primaryKey = true)
    public int ID;
    public String Name;
    public String Active;
}

Answer 2

Instead of List use ArrayList ?

Gson gson = new Gson();
Type t = new TypeToken<ArrayList<MyBranch >>() {}.getType();     
ArrayList<MyBranch > list = (ArrayList<MyBranch >) gson.fromJson(json, t);