JSON Conversion Exception to java object

Question

I am facing json conversion exception. While i converting json to java object.

Here is my json

[  
   {  
      "PrefrenceId":"228f176d-d224-32d7-9bb5-6287a06a68e8",
      "UserId":"327e6c64-bc90-3ae8-8f7d-72837581ca13",
      "QuestionnaireId":"41f31b11-47f5-3e29-8c88-1a3615c978a7",
      "Suggestions":"",
      "Explanation":"",
      "IsActive":true,
      "IsDelete":false,
      "DateCreated":"2016-11-01 09:53:00.000",
      "DateUpdated":"2016-11-01 09:53:17.000"
   },
   {  
      "PrefrenceId":"52a74739-bdd3-33ac-a83f-72f60b1992b5",
      "UserId":"327e6c64-bc90-3ae8-8f7d-72837581ca13",
      "QuestionnaireId":"8cd5ac8e-89db-3d7b-bb2d-4e6735b245de",
      "Suggestions":"",
      "Explanation":"",
      "IsActive":true,
      "IsDelete":false,
      "DateCreated":"2016-11-01 09:48:53.000",
      "DateUpdated":"2016-11-01 09:53:15.000"
   },
   {  
      "PrefrenceId":"ae7fc877-b26a-34d3-a5f3-244c7e777e08",
      "UserId":"327e6c64-bc90-3ae8-8f7d-72837581ca13",
      "QuestionnaireId":"d3b98cde-111c-30d5-a4c9-412a76b656eb",
      "Suggestions":"Camping",
      "Explanation":"",
      "IsActive":true,
      "IsDelete":false,
      "DateCreated":"2016-11-01 09:53:02.000",
      "DateUpdated":"2016-11-01 09:53:19.000"
   },
   {  
      "PrefrenceId":"bcac0da7-31a6-345f-be82-ddff17c29b35",
      "UserId":"327e6c64-bc90-3ae8-8f7d-72837581ca13",
      "QuestionnaireId":"8fb1bda7-7ec8-3538-8aa8-ff84637764a4",
      "Suggestions":"",
      "Explanation":"",
      "IsActive":true,
      "IsDelete":false,
      "DateCreated":"2016-11-01 09:53:07.000",
      "DateUpdated":"2016-11-01 09:53:22.000"
   },
   {  
      "PrefrenceId":"ff46ce3c-70cb-3d25-8dbb-10e9c46d4c2d",
      "UserId":"327e6c64-bc90-3ae8-8f7d-72837581ca13",
      "QuestionnaireId":"3afffc17-30e4-311f-a0fc-8daa3bda6c98",
      "Suggestions":"",
      "Explanation":"",
      "IsActive":true,
      "IsDelete":false,
      "DateCreated":"2016-11-01 09:53:05.000",
      "DateUpdated":"2016-11-01 09:53:20.000"
   }
]

My POJO classes :-

public class SurvivorZAMQuestionList implements Serializable {
    public List<SurvivorZAMQuestionnaire> survivorZAMQuestionnaires;
}


public class SurvivorZAMQuestionnaire implements Serializable {
    public String Suggestions;

    public String PrefrenceId;

    public String IsActive;

    public String IsDelete;

    public String DateCreated;

    public String DateUpdated;

    public String UserId;

    public String QuestionnaireId;

    public String Explanation;
}

But when i am converting json response to json it is showing following error:- com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2

Can anyone tell me what i am missing in pojo class. Any kind of held should be appreciated.

from error, you need to change json response format or change your method for fetchig json response. Post your code for more detail solution — Divyesh Patel
– Divyesh Patel, Commented Nov 10, 2016 at 7:29
static <T> T getObject(String response, Class<T> clazz) { try { Object t = clazz.newInstance(); Field[] fields = clazz.getDeclaredFields(); Gson gson = new Gson(); return (T) gson.fromJson(response, clazz); } catch (InstantiationException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } return null; } @Divyesh i amd using above code for converting response to json — Chandan Wadhwa
– Chandan Wadhwa, Commented Nov 10, 2016 at 7:37

Anand Savjani · Accepted Answer · 2016-11-10 07:33:51Z

2

Your response is proper but your parsing is not proper. So first of all add GSON in your gradle file.

compile 'com.google.code.gson:gson:2.4'

Now use below your code for parsing your response

try {
        JSONArray array = new JSONArray("put your response here");
        Gson gson =  new Gson();
        for (int i = 0 ; i <array.length();i++)
        {
            SurvivorZAMQuestionnaire obj = new SurvivorZAMQuestionnaire();
            obj.add(gson.fromJson(array.getJSONObject(i).toString(),SurvivorZAMQuestionnaire.class));
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }

Add your obj in list and show it :)

answered Nov 10, 2016 at 7:33

Anand Savjani

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Jeevanandhan · Accepted Answer · 2016-11-10 07:34:11Z

1

The Error clearly states that the Gson accepts JsonObject not JsonArray. In your case you can put the response JsonArray into a JsonObject with a key for that JsonArray and give that key as annotation in SurvivorZAMQuestionList. By this way you can easily sort this problem.

Hope this is Helpful :)

answered Nov 10, 2016 at 7:34

Jeevanandhan

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Guntars Ļuta · Accepted Answer · 2016-11-10 07:34:39Z

0

You can try to use GSON library -> compile 'com.google.code.gson:gson:2.8.0'

List<SurvivorZAMQuestionnaire> survivorZAMQuestionnaires;
...

Gson gson = new Gson();
Type listType = new TypeToken<List<SurvivorZAMQuestionnaire>>(){}.getType();
survivorZAMQuestionnaires = gson.fromJson(jsonString, listType);

Type is instance of java.lang.reflect.Type;

answered Nov 10, 2016 at 7:34

Guntars Ļuta

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Randheer · Accepted Answer · 2016-11-10 07:34:52Z

0

Parse Your Json this way,

List<SurvivorZAMQuestionnaire> survivorZAMQuestionnaires = new      Gson().fromJson(json, new TypeToken<List<SurvivorZAMQuestionnaire>>() {
    }.getType());

answered Nov 10, 2016 at 7:34

Randheer

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1 Comment

Randheer Over a year ago

If you are parsing with "SurvivorZAMQuestionList" type then you need to add your complete json under a new JsonObject with key "survivorZAMQuestionnaires".

Manoj Perumarath · Accepted Answer · 2016-11-10 10:25:50Z

0

Do a gradle dependency of gson.

compile 'com.google.code.gson:gson:2.4'

Update code like this;

 private void parseJSON(String jsonMessage) throws JSONException {
            if (jsonMessage.startsWith("[")) {
                Type type = new TypeToken<List<SurvivorZAMQuestionnaire>>() 
                }.getType();
                List<SurvivorZAMQuestionnaire> survivorZAMQuestionnaireList =new Gson().fromJson
                        (jsonMessage, type);
                Log.d("Print List",survivorZAMQuestionnaireList.toString());
            }

        }

edited Nov 10, 2016 at 10:25

Manoj Perumarath

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answered Nov 10, 2016 at 8:50

Aashish Aadarsh

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1 Comment

ρяσѕρєя K Over a year ago

Add some explanation with answer for how this answer help OP in fixing current issue

Community · Accepted Answer · 2017-05-23 12:13:40Z

0

You need List of objects not only object, because your JSON contain list of objects. How to Parse JSON Array in Android with Gson

edited May 23, 2017 at 12:13

CommunityBot

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answered Nov 10, 2016 at 10:40

Bills

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