GSON/Jackson in Android

Question

I was able to successfully parse the below JSON string in Android using JSONObject and JSONArray. Have had no success achieving the same result with GSON or Jackson. Can someone help me with code fragments including POJO definitions to parse this with GSON and Jackson?

{
    "response":{
        "status":200
    },
    "items":[
        {
            "item":{
                "body":"Computing"
                "subject":"Math"
                "attachment":false,
        }
    },
    {
        "item":{
           "body":"Analytics"
           "subject":"Quant"
           "attachment":true,
        }
    },

],
"score":10,
 "thesis":{
        "submitted":false,
        "title":"Masters"
        "field":"Sciences",        
    }
}

Answer 1

Following are simple examples of using Gson and Jackson to deserialize/serialize JSON (similar to the invalid JSON in the original question) to/from a matching Java data structure.

The JSON:

{
    "response": {
        "status": 200
    },
    "items": [
        {
            "item": {
                "body": "Computing",
                "subject": "Math",
                "attachment": false
            }
        },
        {
            "item": {
                "body": "Analytics",
                "subject": "Quant",
                "attachment": true
            }
        }
    ],
    "score": 10,
    "thesis": {
        "submitted": false,
        "title": "Masters",
        "field": "Sciences"
    }
}

The Matching Java Data Structure:

class Thing
{
  Response response;
  ItemWrapper[] items;
  int score;
  Thesis thesis;
}

class Response
{
  int status;
}

class ItemWrapper
{
  Item item;
}

class Item
{
  String body;
  String subject;
  boolean attachment;
}

class Thesis
{
  boolean submitted;
  String title;
  String field;
}

Jackson Example:

import java.io.File;

import org.codehaus.jackson.annotate.JsonAutoDetect.Visibility;
import org.codehaus.jackson.map.ObjectMapper;

public class JacksonFoo
{
  public static void main(String[] args) throws Exception
  {
    ObjectMapper mapper = new ObjectMapper();  
    mapper.setVisibilityChecker(  
      mapper.getVisibilityChecker()  
        .withFieldVisibility(Visibility.ANY));
    Thing thing = mapper.readValue(new File("input.json"), Thing.class);
    System.out.println(mapper.writeValueAsString(thing));
  }
}

Gson Example:

import java.io.FileReader;

import com.google.gson.Gson;

public class GsonFoo
{
  public static void main(String[] args) throws Exception
  {
    Gson gson = new Gson();
    Thing thing = gson.fromJson(new FileReader("input.json"), Thing.class);
    System.out.println(gson.toJson(thing));
  }
}