Question

I have search for many similar questions “Expected BEGIN_OBJECT but was STRING” but nothing work for me.
Here is my json string:

{
"result": "true",
"data": [{
    "from": {
        "user_id": "user1",
        "name": "user1",
        "avatar": "http://zzzzzz.jpg"
    },
    "request_id": "user1:user2"
},
{
    "from": "null",
    "request_id": "user1:user3"
}]
}

This is my mapping entities:

  public class GetFriendResponse {
    public boolean result;
    public List<FriendRequest> data;
  } 

  public class FriendRequest {
     public String request_id;
     public UserInfo from;
  }

  public class UserInfo {
    public String user_id;
    public String name;
    public String avatar;
 }

And I parse json like this:

 Gson gson = new Gson();
 GetFriendResponse  response = gson.fromJson(jsonString,GetFriendResponse.class);

I have check and see the problem is when the result contains "from": "null", it give an error.
Is there any idea?

Answer 1

You should make the webservice return null or {}, not “null”.