Retrofit2 Error : java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $

Question

I am trying to pass an arraylist to php to do some operations. when i tested with postman i got the following resoponse..

{"correct_answers":"2","total_question":"5","message":"Great!. You need to score at least 60% of marks to move next level..","message_percentage":"40","saved_message":"success"}

enter image description here

But when I try to send the request i am getting this error..

java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $

this is my api interface

@POST("questions.php")

@FormUrlEncoded

Call<QuestionResult> correctQuestionData(@Field("tag") String tag, @Field("str_question_answer[]") ArrayList<QuestionAnswers> str_question_answer,
                                         @Field("student_id")  String student_id, @Field("level") String level);

Please show "QuestionResult" class. I think you made mistake in it. — Rana.S
– Rana.S, Commented Aug 2, 2017 at 18:25

Faustino Gagneten · Accepted Answer · 2017-08-02 18:26:34Z

2

The problem is that Gson expecting an object, but is receiving a String, this is because the format of the JSON probably is wrong. The JSON has to start with

Please, review the JSON format.

EDIT: Review the parameters of your query, I think that you are sending others parameters instead of what you are putting in postman and the server responding with a String instead of a JSON

edited Aug 2, 2017 at 18:26

answered Aug 2, 2017 at 18:08

Faustino Gagneten

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3 Comments

Sharaaf Nazeer Over a year ago

{"correct_answers":"2","total_question":"5","message":"Great!. You need to score at least 60% of marks to move next level..","message_percentage":"40","saved_message":"success"} this is the format I received when I tested it with postman.

Sharaaf Nazeer Over a year ago

echo json_encode([ "correct_answers" => count($correct_answers)."", "total_question" => $total_question."", "message" => $results["message"], "message_percentage" => $percentage."", "message"=> $results["message"], "saved_message" =>$results["saved_message"] ]); This is what i have defined in the php code

Faustino Gagneten Over a year ago

Try to copy and paste the result from the browser when you fetch the data or put a break point into the funciont "onFailure" in reotrofit2 to kwnow the answer. May be you are sending a wrong paremeter and is not the same answer

Rana.S · Accepted Answer · 2017-08-02 18:32:10Z

0

I think you made mistake in QuestionResult class. It's format should be like

public class QuestionResult{

public String correct_answers;
public String total_question;
public String message;  
public String message_percentage;
public String saved_message;

}

answered Aug 2, 2017 at 18:32

Rana.S

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