Develop Reference

Java GSON Error: JSON document was not fully consumed

So I have a JSON document that I want to read with different values including array like below
{ "name": "MacBook", "price": 1299, "stock": 10, "picture": "macbook.jpeg", "categories": [{"id": 1,"name": "macbook"},{"id": 2, "name":"notebook"}]}
I created a couple of POJO java classes to read them:
1 - Class (Product.java)
package models;
import java.util.ArrayList;
public class Product {
String name;
int price;
int stock;
String picture;
public ArrayList<Categories> categories;
public Product(String name, int price, int stock, String picture) {
this.name = name;
this.price = price;
this.stock = stock;
this.picture = picture;
this.categories = new ArrayList<>();
}
public void setName(String name) {
this.name = name;
}
public void setPrice(int price) {
this.price = price;
}
public void setStock(int stock) {
this.stock = stock;
}
public void setPicture(String picture) {
this.picture = picture;
}
public void setCategories(ArrayList<Categories> categories) {
this.categories = categories;
}
public String getName() {
return name;
}
public int getPrice() {
return price;
}
public int getStock() {
return stock;
}
public String getPicture() {
return picture;
}
public ArrayList<Categories> getCategories() {
return categories;
}
#Override
public String toString() {
return "Product{" +
"productName='" + name + '\'' +
", productPrice=" + price +
", productStock=" + stock +
", productPicture='" + picture + '\'' +
", categories=" + categories +
'}';
}
}
2 Class (Categories.java) to read the array
package models;
public class Categories {
private int id;
private String description;
public int getId() {
return id;
}
public String getDescription() {
return description;
}
public void setId(int id) {
this.id = id;
}
public void setDescription(String description) {
this.description = description;
}
public Categories(int id, String description) {
this.id = id;
this.description = description;
}
#Override
public String toString() {
return "Category{" + "id=" + id + ", description=" + description + '}';
}
}
And this is the main
package p3;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import models.Product;
import com.google.gson.Gson;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.lang.reflect.Type;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
public class Main {
public static void main(String[] args) {
Gson gson = new GsonBuilder()
.setLenient()
.create();
String fichero = "";
try (BufferedReader br = new BufferedReader(new FileReader("src/res/FitxersJSON/products.json"))) {
String linea;
while ((linea = br.readLine()) != null) {
fichero += linea;
}
} catch (IOException ex) {
System.out.println(ex.getMessage());
}
Product productObject = gson.fromJson(fichero.toString(), Product.class);
System.out.println(productObject);
}
}
For some reason when I execute the main I get this error
Exception in thread "main" com.google.gson.JsonIOException: JSON document was not fully consumed.
at com.google.gson.Gson.assertFullConsumption(Gson.java:861)
at com.google.gson.Gson.fromJson(Gson.java:854)
at com.google.gson.Gson.fromJson(Gson.java:802)
at com.google.gson.Gson.fromJson(Gson.java:774)
at p3.Main.main(Main.java:42)
I have tried formating the JSON document but looks like everything is ok because I can clearly read it printing the "linea" value in each loop.
Thank you in advance.
[EDIT]
I solved the problem by adding "[" and "]" at the beginning and the end of the JSON file and also "," to all lines excepting the last one.
package p3;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import models.Categories;
import models.Product;
import java.io.*;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
public class Main {
public static void main(String[] args) {
ex2_readProducts();
ex3_addProducts();
}
private static void ex2_readProducts() {
Gson gson = new Gson();
Type collectionType = new TypeToken<Collection<Product>>() {
}.getType();
String file = "";
try (BufferedReader br = new BufferedReader(new FileReader("src/resources/products.json"))) {
String linea;
System.out.println("***************************** Reading the JSON file *********************************");
while ((linea = br.readLine()) != null) {
file += linea;
}
Collection<Product> enums = gson.fromJson(file, collectionType);
int counter = 0;
for (Product r : enums) {
counter++;
System.out.println("Product nº: " + counter );
System.out.println(r);
}
System.out.println("Result: " + counter + " products read from the file" );
System.out.println("***************************** Finished reading the JSON file *********************************");
} catch (IOException ex) {
System.out.println(ex.getMessage());
}
}
public static void ex3_addProducts() {
Gson gson = new Gson();
Categories c1 = new Categories(1, "tablet");
Categories c2 = new Categories(2, "game");
Categories c3 = new Categories(3, "phone");
Categories c4 = new Categories(5, "smartwatch");
Categories c5 = new Categories(9, " scooter");
Product p1 = new Product("ipad32", 1200, 23, "ipad32.jpg");
Product p2 = new Product("soccer 3000", 100, 500, "soccer.jpg");
Product p3 = new Product("pixel", 900, 900, "pixel.jpg");
Product p4 = new Product("mi watch", 300, 23, "miwatch.jpg");
Product p5 = new Product("mi scooter 365", 365, 23, "miscooter.jpg");
ArrayList<Categories> categoriesArrayList1;
categoriesArrayList1 = new ArrayList<>(Arrays.asList(c1, c3));
ArrayList<Categories> categoriesArrayList2;
categoriesArrayList2 = new ArrayList<>(Arrays.asList(c1, c2, c3));
ArrayList<Categories> categoriesArrayList3;
categoriesArrayList3 = new ArrayList<>(Arrays.asList(c1, c4, c3));
ArrayList<Categories> categoriesArrayList4;
categoriesArrayList4 = new ArrayList<>(Arrays.asList(c1, c3));
ArrayList<Categories> categoriesArrayList5;
categoriesArrayList5 = new ArrayList<>(Arrays.asList(c5, c1));
p1.setCategories(categoriesArrayList1);
p2.setCategories(categoriesArrayList2);
p3.setCategories(categoriesArrayList3);
p4.setCategories(categoriesArrayList4);
p5.setCategories(categoriesArrayList5);
Product[] productsArray = {p1, p2, p3, p4, p5};
try (BufferedWriter br = new BufferedWriter(new FileWriter("src/resources/products2.json"))) {
System.out.println("********************** Adding products to a new file: *********************************");
br.write("[");
br.newLine();
int counter = 0;
for (int i = 0; i < productsArray.length; i++) {
System.out.println("Product nº: " + (i+1) + '\n' + productsArray[i]);
String json = gson.toJson(productsArray[i]);
br.write(json);
if (i != productsArray.length - 1) {
br.write(",");
}
br.newLine();
counter = (i+1);
}
br.write("]");
System.out.println("Result: " + counter + " products added to the file" );
System.out.println("**************************** Finished adding products *****************************");
} catch (IOException ex) {
System.out.println(ex.getMessage());
}
}
}

First of all you are using Department instead of Categories in the java class. As I see it contains different fields. I believe your problem is inside the json file or Main class reading the file. Using Guava gives you easier reading files. See my code:
products.json
{
"name": "MacBook",
"price": 1299,
"stock": 10,
"picture": "macbook.jpeg",
"categories": [
{
"id": 1,
"name": "macbook"
},
{
"id": 2,
"name": "notebook"
}
]
}
Main.class
package com.test;
import com.google.common.io.Resources;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import java.nio.charset.StandardCharsets;
public class Main {
public static void main(String[] args) throws Exception {
Gson gson = new GsonBuilder()
.create();
String products = Resources.toString(Resources.getResource("products.json"), StandardCharsets.UTF_8).trim();
Product productObject = gson.fromJson(products, Product.class);
System.out.println(productObject);
}
}
output is
Product{name='MacBook', price=1299, stock=10, picture='macbook.jpeg', categories=[Category{id=1, name='macbook'}, Category{id=2, name='notebook'}]}

I think main problem that in json you have {"id": 1,"name": "macbook"} but in java class Categories you use private String description;, how json parser should understand that description and name are same field?
In my opioion, you should try to use name insted of description, for example
package models;
public class Categories {
private int id;
private String name;
public int getId() {
return id;
}
public String getName() {
return name;
}
public void setId(int id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
...
}

Android: Use result from stringrequest in individual textviews

I have been able to get a string from an url, using volley. This string is now shown as one block in a textview. But I would like to be able to display this data in individual textviews. How could I do this?
Maybe important to know: I'm completely new at programming and this is my first week I'm doing this. So my method I used could be strange, and this might be a stupid question, but I'm just trying to learn, and to get the result I want.
This is the code I have now, to get the data from the url:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = findViewById(R.id.text);
queue = Volley.newRequestQueue(this);
StringRequest request = new StringRequest(Request.Method.GET, URL, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
textView.setText(response.toString());
Toast.makeText(MainActivity.this,response.toString(),Toast.LENGTH_LONG).show();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.d("error",error.toString());
}
});
queue.add(request);
And this is how the result from the GET from the url looks like:
{"DeliveryDetailId":91003,"Delivery":{"DeliveryId":91,"DeliveryNumber":"1248","DropLocation":null,"DeliveryState":0},"ProductNumber":null,"Description":null,"PickLocation":"104","LocationCheck":null,"Quantity":64.0,"Histories":[],"BinNumberToUse":null}
So in this case I would like to have textviews which show the DeliveryID, Picklocation and Quantity. How can I extract this info from the string, so I can show it in the Textviews?

create model classes like below and store the response in Response.class
Then you can able to access DeliveryID by calling getDeliveryID()
-----------------------------------com.saranga.app.model.Delivery.java-----------------------------------
package com.saranga.app.model;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Delivery {
#SerializedName("DeliveryId")
#Expose
private Integer deliveryId;
#SerializedName("DeliveryNumber")
#Expose
private String deliveryNumber;
#SerializedName("DropLocation")
#Expose
private Object dropLocation;
#SerializedName("DeliveryState")
#Expose
private Integer deliveryState;
public Integer getDeliveryId() {
return deliveryId;
}
public void setDeliveryId(Integer deliveryId) {
this.deliveryId = deliveryId;
}
public String getDeliveryNumber() {
return deliveryNumber;
}
public void setDeliveryNumber(String deliveryNumber) {
this.deliveryNumber = deliveryNumber;
}
public Object getDropLocation() {
return dropLocation;
}
public void setDropLocation(Object dropLocation) {
this.dropLocation = dropLocation;
}
public Integer getDeliveryState() {
return deliveryState;
}
public void setDeliveryState(Integer deliveryState) {
this.deliveryState = deliveryState;
}
}
-----------------------------------com.saranga.app.model.Response.java-----------------------------------
package com.saranga.app.model;
import java.util.List;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Response {
#SerializedName("DeliveryDetailId")
#Expose
private Integer deliveryDetailId;
#SerializedName("Delivery")
#Expose
private Delivery delivery;
#SerializedName("ProductNumber")
#Expose
private Object productNumber;
#SerializedName("Description")
#Expose
private Object description;
#SerializedName("PickLocation")
#Expose
private String pickLocation;
#SerializedName("LocationCheck")
#Expose
private Object locationCheck;
#SerializedName("Quantity")
#Expose
private Double quantity;
#SerializedName("Histories")
#Expose
private List<Object> histories = null;
#SerializedName("BinNumberToUse")
#Expose
private Object binNumberToUse;
public Integer getDeliveryDetailId() {
return deliveryDetailId;
}
public void setDeliveryDetailId(Integer deliveryDetailId) {
this.deliveryDetailId = deliveryDetailId;
}
public Delivery getDelivery() {
return delivery;
}
public void setDelivery(Delivery delivery) {
this.delivery = delivery;
}
public Object getProductNumber() {
return productNumber;
}
public void setProductNumber(Object productNumber) {
this.productNumber = productNumber;
}
public Object getDescription() {
return description;
}
public void setDescription(Object description) {
this.description = description;
}
public String getPickLocation() {
return pickLocation;
}
public void setPickLocation(String pickLocation) {
this.pickLocation = pickLocation;
}
public Object getLocationCheck() {
return locationCheck;
}
public void setLocationCheck(Object locationCheck) {
this.locationCheck = locationCheck;
}
public Double getQuantity() {
return quantity;
}
public void setQuantity(Double quantity) {
this.quantity = quantity;
}
public List<Object> getHistories() {
return histories;
}
public void setHistories(List<Object> histories) {
this.histories = histories;
}
public Object getBinNumberToUse() {
return binNumberToUse;
}
public void setBinNumberToUse(Object binNumberToUse) {
this.binNumberToUse = binNumberToUse;
}
}

You need to decode your JSONObject and individually get each element unless it's in a JSONArray in that case you need to loop through it
#Override
public void onResponse(String response) {
JSONObject json = new JSONObject(response);
textView.setText(json.getString("DeliveryDetailld"));
JSONObject details = json.getJSONObject("Delivery");
//Get data in Delivery Object
textView2.setText(details.getString("DeliveryId"));
}

How to call key inside another key with Json

I'm trying to pull one result into another, but I'm not sure how to do that. In case I have already been able to pull other results, but the one that is inside another key I can not.
I'm doing with Retrofit. I looked for some tutorials and video lessons, but I could not do it.
package com.example.apiunion.apiunion.models;
import java.util.ArrayList;
public class UltimosLancados {
private ArrayList<Lancamentos> dados;
public ArrayList<Lancamentos> getDados() {
return dados;
}
public void setDados(ArrayList<Lancamentos> dados) {
this.dados = dados;
}
}
public class Lancamentos implements Serializable {
private String titulo;
private String url;
private String capa;
private int id;
public String getCapa() {
return capa;
}
public void setCapa(String capa) {
this.capa = capa;
}
public String getTitulo() {
return titulo;
}
public void setTitulo(String titulo) {
this.titulo = titulo;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
}

Parsing the JSON sample provided:
Android framework classes: JSONObject, JSONArray
package com.example.elletlar.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import org.json.JSONArray;
import org.json.JSONObject;
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getName();
private static final String TEST_STRING =
"{\"orden\":\"2018-7-199\"," +
"\"s\":\"2018-7-199\"," +
"\"capitulos\":{" +
"\"dados\":[" +
"{\"id\":\"169472\"," +
"\"capitulo\":\"75\"}, " +
"{\"id\":\"14952\"," +
"\"capitulo\":\"80\"}" +
"]" +
"}" +
"}";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
final JSONObject root = new JSONObject(TEST_STRING);
final String orden = root.getString("orden");
Log.i(TAG, orden);
final String s = root.getString("s");
Log.i(TAG, s);
final JSONObject capitulos = root.getJSONObject("capitulos");
final JSONArray dados = capitulos.getJSONArray("dados");
for (int i = 0; i < dados.length(); ++i) {
final JSONObject currentObj = dados.getJSONObject(i);
Log.i(TAG, currentObj.getString("capitulo"));
Log.i(TAG, currentObj.getString("id"));
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
I've left the insertion of the values into the Lancamentos object Array to you. I'm sure that you know how to do that now that the JSON is fully parsed.

Java.net(RestFul service JSON reponse parsing issue) How to convert list of same item in JSON reponse String to Java Object?

I am calling Restful service using below code :(Java.net implementation )
StringBuilder responseStrBuilder = new StringBuilder();
try
{
URL url = new URL(restUrl);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod(httpRequestMethod);
conn.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
conn.setRequestProperty("Content-Type", "application/json");
if (requestHeaders != null)
{
for (Map.Entry<String, String> entry : requestHeaders.entrySet())
{
conn.setRequestProperty(entry.getKey(), entry.getValue());
}
}
conn.setDoInput(true);
conn.setDoOutput(true);
OutputStream os = conn.getOutputStream();
os.write(urlParameters.getBytes());
os.flush();
os.close();
if (conn.getResponseCode() != 200) {//do something}
br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
while ((output = br.readLine()) != null)
responseStrBuilder.append(output);
Approach 1:
I have below string(JSON String) as my Restful service response , how can I convert it to Java object. Since same(Itm) object is repeated multiple times if I use org.codehaus.jettison.json.JSONObject myObject = new org.codehaus.jettison.json.JSONObject(responseStrBuilder.toString());
It only reads first Itm Object and does not bring list of all item object.
JSON String output from service :
{"Response":{"RID":"04'34'",
"Itm":{"id":{"ab":"1","cd":"12"},"qw":"JK","name":"abcd "},
"Itm":{"id":{"ab":"2","cd":"34},"qw":"JK","name":"asdf "},
"Itm":{"id":{"ab":"3","cd":"12"},"qw":"JK","name":"fghj "}
}}
Approach 2:
I also tried below snippet with correct Java object with setters and getters
ObjectMapper objectMapper = new ObjectMapper();
mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
MyJavaReponseObject javaObj = mapper.readValue(json, MyJavaReponseObject.class);
This approach also reads only one object of Itm and not all the object as its not coming in array format in JSON string. Is there any better way of getting all the object(Itm) mapped to single List of Object in java pojo ?

You can use the List class in your response object, if you should parse that json string itself.
I have a ReponseJSON class with json objects, one Response and three Itms
static class ReponseJSON {
private Response Response;
#JsonProperty("Response")
public Response getResponse() {
return Response;
}
public void setResponse(Response Response) {
this.Response = Response;
}
static class Response {
private String rid;
private Itm Itm;
private List<Itm> listItm = new ArrayList<Itm>();
public Itm getItm() {
return Itm;
}
#JsonProperty("Itm")
public void setItm(Itm Itm) {
this.Itm = Itm;
listItm.add(Itm);
}
public String getRID() {
return rid;
}
public List<Itm> getItms() {
return listItm;
}
#JsonProperty("RID")
public void setRID(String rid) {
this.rid = rid;
}
static class Itm {
private Id id;
private String qw, name;
public String getQw() {
return qw;
}
public void setQw(String qw) {
this.qw = qw;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Id getId() {
return id;
}
public void setId(Id id) {
this.id = id;
}
static class Id {
private String ab, cd;
public String getCd() {
return cd;
}
public void setCd(String cd) {
this.cd = cd;
}
public String getAb() {
return ab;
}
public void setAb(String ab) {
this.ab = ab;
}
}
}
}
}
In a Response class, I have a list class and save a Itm object whenever object mapper call this class.
static class Response {
... skip ..
private List<Itm> listItm = new ArrayList<Itm>();
... skip ..
#JsonProperty("Itm")
public void setItm(Itm Itm) {
this.Itm = Itm;
listItm.add(Itm);
}
}
Check the full source code as follows.
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
public class JacksonParserTest {
static class ReponseJSON {
private Response Response;
#JsonProperty("Response")
public Response getResponse() {
return Response;
}
public void setResponse(Response Response) {
this.Response = Response;
}
static class Response {
private String rid;
private Itm Itm;
private List<Itm> listItm = new ArrayList<Itm>();
public Itm getItm() {
return Itm;
}
#JsonProperty("Itm")
public void setItm(Itm Itm) {
this.Itm = Itm;
listItm.add(Itm);
}
public String getRID() {
return rid;
}
public List<Itm> getItms() {
return listItm;
}
#JsonProperty("RID")
public void setRID(String rid) {
this.rid = rid;
}
static class Itm {
private Id id;
private String qw, name;
public String getQw() {
return qw;
}
public void setQw(String qw) {
this.qw = qw;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Id getId() {
return id;
}
public void setId(Id id) {
this.id = id;
}
static class Id {
private String ab, cd;
public String getCd() {
return cd;
}
public void setCd(String cd) {
this.cd = cd;
}
public String getAb() {
return ab;
}
public void setAb(String ab) {
this.ab = ab;
}
}
}
}
}
public static void main(String[] args) {
String responseJson =
"{\"Response\":{\"RID\":\"04'34'\","
+ "\"Itm\":{\"id\":{\"ab\":\"1\",\"cd\":\"12\"},\"qw\":\"JK\",\"name\":\"abcd\"}"
+ ",\"Itm\":{\"id\":{\"ab\":\"2\",\"cd\":\"34\"},\"qw\":\"JK\",\"name\":\"asdf\"}"
+ ",\"Itm\":{\"id\":{\"ab\":\"3\",\"cd\":\"12\"},\"qw\":\"JK\",\"name\":\"fghj\"}"
+ "}} ";
ObjectMapper mapper = new ObjectMapper();
ReponseJSON responseObj = null;
try {
responseObj = mapper.readValue(responseJson, ReponseJSON.class);
ReponseJSON.Response response = responseObj.getResponse();
for(int i = 0; i < response.getItms().size(); i++)
{
ReponseJSON.Response.Itm item = response.getItms().get(i);
System.out.println(item.getId().getAb());
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
The version of my jackson mapper is 2.9.1.
You check the main method of the source, because the JSON string you prepared is invalid as coddemonkey mentioned.
Have a good day.

Make your json response looks something similar to this
{"Response":{"RID":"04'34'",
"Itms":[{"id":{"ab":"1","cd":"12"},"qw":"JK","name":"abcd "},
{"id":{"ab":"2","cd":"34"},"qw":"JK","name":"asdf "},
{"id":{"ab":"3","cd":"12"},"qw":"JK","name":"fghj "}]
}}
then, use org.json jar to parse the string to jsonObject
JSONObject jsonObject=new JSONObject(responseString);
This is one type of solution, if you can't change the response as mentioned above then you have to manually parse the string(using java bean) there is no other option available.

Android Dynamic response type Retroft

hello i have Json response like this
[
{
"question": "hhhhh",
"question_answer": "hhhh ",
"question_type": "question type",
"questioner_age": "questioner age",
"questioner_city": "questioner city",
"questioner_country": "questioner country",
"questioner_name": "questioner name",
"questioner_sex": "questioner sex",
"comments_allowed": "1",
"question_id": "63",
"question_date": "05/08/2017 - 19:33",
"is_public": "1"
},
{
"question": "hhhh !!",
"question_answer": "hhhh",
"question_type": [],
"questioner_age": [],
"questioner_city": [],
"questioner_country": [],
"questioner_name": "hhhhh",
"questioner_sex": [],
"comments_allowed": "1",
"question_id": "57",
"question_date": "04/30/2017 - 14:24",
"is_public": "1"
}
]
if the column is null will return as an array like this "question_type": [],
if not will return as a string !
so i tried to get this response on retrofit but i failed and always got this error
com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 4 column 2 path $
after i searched in the internet i tried something like this but its not working !!
Gson gson = new Gson();
String json = response.body().toString();
if (json instanceof String)
{
MyQuestionModelString parseObject = gson.fromJson(json, MyQuestionModelString.class);
apiCallResponse.onSuccess(parseObject,responseMessage);
}else {
MyQuestionModel parseObject = gson.fromJson(json, MyQuestionModel.class);
apiCallResponse.onSuccess(parseObject,responseMessage);
}
any help !
UPDATAE !
this is my model for this response and same error !!!
public class MyQuestionModel {
#SerializedName("question")
#Expose
private String question;
#SerializedName("question_answer")
#Expose
private String questionAnswer;
#SerializedName("question_type")
#Expose
private List<Object> questionType = null;
#SerializedName("questioner_age")
#Expose
private List<Object> questionerAge = null;
#SerializedName("questioner_city")
#Expose
private List<Object> questionerCity = null;
#SerializedName("questioner_country")
#Expose
private List<Object> questionerCountry = null;
#SerializedName("questioner_name")
#Expose
private String questionerName;
#SerializedName("questioner_sex")
#Expose
private List<Object> questionerSex = null;
#SerializedName("comments_allowed")
#Expose
private String commentsAllowed;
#SerializedName("question_id")
#Expose
private String questionId;
#SerializedName("question_date")
#Expose
private String questionDate;
#SerializedName("is_public")
#Expose
private String isPublic;
}
My Main issue that how to define this field ! question_type
screen shot

During the parsing of json if the SerializedName key is not found it will throw an exception. Use #Expose to let the deserializer to know that this field can be null. Here is a similar Model of your mentioned response
public class ResponsePojo {
List<Data> data;
public class Data {
#Expose
#SerializedName("question")
String question;
#Expose
#SerializedName("question_answer")
String questionAnswer;
#Expose
#SerializedName("question_type")
String questionType;
#Expose
#SerializedName("questioner_age")
String questionerAge;
#Expose
#SerializedName("questioner_city")
String questionerCity;
#Expose
#SerializedName("questioner_country")
String questionerCountry;
#Expose
#SerializedName("questioner_name")
String questionerName;
#Expose
#SerializedName("questioner_sex")
String questionerSex;
#Expose
#SerializedName("comments_allowed")
String commentsAllowed;
#Expose
#SerializedName("question_id")
String questionId;
#Expose
#SerializedName("question_date")
String questionDate;
#Expose
#SerializedName("is_public")
String isPublic;
}
}

You must indicate which paramters or objects in the model are optional with #Exposed tag.
Example
#Expose
#SerializedName("question_type")
private String mQuestionType;

You problem is
ava.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 4 column 2 path $
If your json code is [...],your return is JSONArray , you can use Gsonto parse it to List<Object> .
If your json code is {...},your return is JSONObject , you can use Gsonto parse it to Object .
So you should use List<MyQuestionModel> to get parsed data .
Change MyQuestionModel to List<MyQuestionModel> in your call code .
Sample
Call<List<MyQuestionModel>> getData();
And my code for doing it .
JSONEntity for you json
public class JSONEntity {
/**
* question : hhhhh
* question_answer : hhhh
* question_type : question type
* questioner_age : questioner age
* questioner_city : questioner city
* questioner_country : questioner country
* questioner_name : questioner name
* questioner_sex : questioner sex
* comments_allowed : 1
* question_id : 63
* question_date : 05/08/2017 - 19:33
* is_public : 1
*/
private String question;
private String question_answer;
private String question_type;
private String questioner_age;
private String questioner_city;
private String questioner_country;
private String questioner_name;
private String questioner_sex;
private String comments_allowed;
private String question_id;
private String question_date;
private String is_public;
public String getQuestion() {
return question;
}
public void setQuestion(String question) {
this.question = question;
}
public String getQuestion_answer() {
return question_answer;
}
public void setQuestion_answer(String question_answer) {
this.question_answer = question_answer;
}
public String getQuestion_type() {
return question_type;
}
public void setQuestion_type(String question_type) {
this.question_type = question_type;
}
public String getQuestioner_age() {
return questioner_age;
}
public void setQuestioner_age(String questioner_age) {
this.questioner_age = questioner_age;
}
public String getQuestioner_city() {
return questioner_city;
}
public void setQuestioner_city(String questioner_city) {
this.questioner_city = questioner_city;
}
public String getQuestioner_country() {
return questioner_country;
}
public void setQuestioner_country(String questioner_country) {
this.questioner_country = questioner_country;
}
public String getQuestioner_name() {
return questioner_name;
}
public void setQuestioner_name(String questioner_name) {
this.questioner_name = questioner_name;
}
public String getQuestioner_sex() {
return questioner_sex;
}
public void setQuestioner_sex(String questioner_sex) {
this.questioner_sex = questioner_sex;
}
public String getComments_allowed() {
return comments_allowed;
}
public void setComments_allowed(String comments_allowed) {
this.comments_allowed = comments_allowed;
}
public String getQuestion_id() {
return question_id;
}
public void setQuestion_id(String question_id) {
this.question_id = question_id;
}
public String getQuestion_date() {
return question_date;
}
public void setQuestion_date(String question_date) {
this.question_date = question_date;
}
public String getIs_public() {
return is_public;
}
public void setIs_public(String is_public) {
this.is_public = is_public;
}
}
And the code for parse it .
Gson gson = new Gson();
String jsonString = response.body().string();
Type type = new TypeToken<List<JSONEntity>>() {
}.getType();
List<JSONEntity> datas = gson.fromJson(jsonString, type);
EDIT
If your response is JSONArray , you can try like this .
List<JSONEntity> datas = response.body();

Try to change your JSON Structure
First Approach
To
If the column is null return "question_type": null,else show "question_type": "value"
Instead
If the column is null will return as an array like this "question_type": [], if not will return as a string!
Second Approach Without changing Json structure
Handling Dynamic JSON Using Gson
Try this:
You have to use deserialize to parse dynamic datatype in json
In the reponse pojo use object
Ex:
Call<Object> call = //your API call ResponsePojo instead use `Object`
call.enqueue(new Callback<Object>()
{
#Override
public void onResponse(Response<Object> response, Retrofit retrofit)
{
try {
JSONArray jsonArray=new JSONArray(json);
for (int i = 0; i < jsonArray.length(); i++) {
Gson gson = new GsonBuilder()
.registerTypeAdapter(ServerResponse.class, new ServerResponse.OptionsDeserilizer())
.create();
ServerResponse serverResponse=gson.fromJson(jsonArray.get(i).toString(), ServerResponse.class);
System.out.println(serverResponse);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
#Override
public void onFailure(Throwable t)
{
///Handle failure
}
});
Use this ServerResponsePojo with JsonDeserializer
import android.text.TextUtils;
import com.google.gson.Gson;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
import com.google.gson.reflect.TypeToken;
import java.lang.reflect.Type;
public class ServerResponse {
#SerializedName("question")
#Expose
private String question;
#SerializedName("question_answer")
#Expose
private String questionAnswer;
private String questionerName;
#SerializedName("comments_allowed")
#Expose
private String commentsAllowed;
#SerializedName("question_id")
#Expose
private String questionId;
#SerializedName("question_date")
#Expose
private String questionDate;
#SerializedName("is_public")
#Expose
private String isPublic;
public String getQuestion() {
return question;
}
public void setQuestion(String question) {
this.question = question;
}
public String getQuestionAnswer() {
return questionAnswer;
}
public void setQuestionAnswer(String questionAnswer) {
this.questionAnswer = questionAnswer;
}
/* public List<OptionValue> getQuestionerAge() {
return questionerAge;
}
public void setQuestionerAge(List<OptionValue> questionerAge) {
this.questionerAge = questionerAge;
}
public List<OptionValue> getQuestionerCity() {
return questionerCity;
}
public void setQuestionerCity(List<OptionValue> questionerCity) {
this.questionerCity = questionerCity;
}
public List<OptionValue> getQuestionerCountry() {
return questionerCountry;
}
public void setQuestionerCountry(List<OptionValue> questionerCountry) {
this.questionerCountry = questionerCountry;
}
*/
public String getQuestionerName() {
return questionerName;
}
public void setQuestionerName(String questionerName) {
this.questionerName = questionerName;
}
/*
public List<OptionValue> getQuestionerSex() {
return questionerSex;
}
public void setQuestionerSex(List<OptionValue> questionerSex) {
this.questionerSex = questionerSex;
}*/
public String getCommentsAllowed() {
return commentsAllowed;
}
public void setCommentsAllowed(String commentsAllowed) {
this.commentsAllowed = commentsAllowed;
}
public String getQuestionId() {
return questionId;
}
public void setQuestionId(String questionId) {
this.questionId = questionId;
}
public String getQuestionDate() {
return questionDate;
}
public void setQuestionDate(String questionDate) {
this.questionDate = questionDate;
}
public String getIsPublic() {
return isPublic;
}
public void setIsPublic(String isPublic) {
this.isPublic = isPublic;
}
public class OptionValue {
}
public void setQuestionType(String questionType) {
this.questionType = questionType;
}
String questionType;
public static class OptionsDeserilizer implements JsonDeserializer<ServerResponse> {
#Override
public ServerResponse deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
Type listType = new TypeToken<ServerResponse>() {
}.getType();
ServerResponse options = (ServerResponse) new Gson().fromJson(json, listType);
JsonObject jsonArrayValue = json.getAsJsonObject();
for (int i = 0; i < jsonArrayValue.size(); i++) {
JsonObject jsonObject = jsonArrayValue.getAsJsonObject();
if (jsonObject.has("question_type")) {
JsonElement elem = (JsonElement) jsonObject.get("question_type");
if (elem != null && !elem.isJsonNull() && !elem.isJsonArray()) {
String valuesString = elem.getAsString();
if (!TextUtils.isEmpty(valuesString)) {
options.setQuestionType(valuesString);
} else {
options.setQuestionType("");
}
//Do your other stuffs
}
}
}
return options;
}
}
}
This is working happy codeing