android - Gson fromJson() returns object with null attrubutes -

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i'm trying create java objects using line:

quiz currentquiz = gson.fromjson(json, quiz.class);

but this:

quiz object after fromjson

here 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 question(){  }  public question(int question_number, string question_text, answer[] answers) {     super();     this.question_number = question_number;     this.question_text = question_text;     this.answers = answers; }  public int getquestion_number() {     return question_number; }  public void setquestion_number(int question_number) {     this.question_number = question_number; }  public string getquestion_text() {     return question_text; }  public void setquestion_text(string question_text) {     this.question_text = question_text; }  public answer[] getanswers() {     return answers; }  public void setanswers(answer[] answers) {     this.answers = answers; } }

answer:

public class answer {  private string answer_text; private boolean correct_yn;  public answer(){  }  public string getanswer_text() {     return answer_text; }  public void setanswer_text(string answer_text) {     this.answer_text = answer_text; }  public boolean iscorrect_yn() {     return correct_yn; }  public void setcorrect_yn(boolean corrent_yn) {     this.correct_yn = corrent_yn; } }

and here json:

{ "quiz": {     "ref": "45g36745bu46",     "broadcast_dt": "2013-03-03t00:00:00z",     "questions": [         {             "question_number": 1,             "question_text": "example question one",             "answers": [                 {                     "answer_text": "answer one",                     "correct_yn": false                 },                 {                     "answer_text": "answer two",                     "correct_yn": true                 },                 {                     "answer_text": "answer three",                     "correct_yn": false                 }             ]         },         {             "question_number": 2,             "question_text": "question number two",             "answers": [                 {                     "answer_text": "something",                     "correct_yn": false                 },                 {                     "answer_text": "something else",                     "correct_yn": false                 },                 {                     "answer_text": "another thing",                     "correct_yn": true                 }             ]         },         {             "question_number": 3,             "question_text": "and third question additional question text appearing here.",             "answers": [                 {                     "answer_text": "cow",                     "correct_yn": false                 },                 {                     "answer_text": "pig",                     "correct_yn": true                 }             ]         }     ] } }

any ideas why happens? don't error message or logcat output.

from json: see that, @ root level

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

so, need 1 level down start parsing using gson.

so, try out,

jsonobject quizobject = json.get("quiz");  quiz currentquiz = gson.fromjson(quizobject.tostring(), quiz.class);

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