Gson fromJson() returns object with null attrubutes

Question

I'm trying to create some Java objects using this line: `Quiz currentQuiz = gson.fromJson(json, Quiz.class);` But the all I get is this: Here are my object classes: Quiz: ``` public class Quiz { private String ref; private String broadcast_dt; private Question[] questions; public Quiz() { // TODO Auto-generated constructor stub } public String getRef() { return ref; } public void setRef(String ref) { this.ref = ref; } public String getBroadcast_dt() { return broadcast_dt; } public void setBroadcast_dt(String broadcast_dt) { this.broadcast_dt = broadcast_dt; } public Quiz(String ref, String broadcast_dt, Question[] questions) { super(); this.ref = ref; this.broadcast_dt = broadcast_dt; this.questions = questions; } public Question[] getQuestions() { return questions; } public void setQuestions(Question[] questions) { this.questions = questions; } } ``` Question: ``` public class Question { private int question_number; private String question_text; private Answer[] answers; public Quest…

Accepted Answer

From your json: i see that, at the root level it is something like

{quiz:{quizObject having ref,etc.,}}

So, you need to get one level down to start parsing using gson.

So, try this out,

```
JSONObject quizObject = json.get("quiz");

Quiz currentQuiz = gson.fromJson(quizObject.toString(), Quiz.class);
```

Gson fromJson() returns object with null attrubutes

Solution

Problem