Develop Reference

java.lang.IllegalStateExeption: Expectet a string but was BEGIN_ARRAY at line 1 column 16 path $[0].questions

I looked at some other threads about this topic and integrated the solution it offered but it still throws the same error. this is the first time i try to call an api on android. here i want to 'GET' an array of objects. There is no stack trace since the app does not crash. i think the problem has to do with the array of questions.
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("http://192.168.1.100:3000/api/")
.addConverterFactory(GsonConverterFactory.create())
.build();
JsonPlaceHolderApi jsonPlaceHolderApi = retrofit.create(JsonPlaceHolderApi.class);
Call<List<Post>> call = jsonPlaceHolderApi.getPosts();
call.enqueue(new Callback<List<Post>>() {
#Override
public void onResponse(Call<List<Post>> call, Response<List<Post>> response) {
if (!response.isSuccessful()){
textViewResult.setText("Code: " + response.code());
return;
}
List<Post> posts = response.body();
for (Post post : posts){
String content = "";
content += "Doctor: " + post.getDoctor() + "\n";
content += "Name: " + post.getName() + "\n";
content += "Questions: " + post.getQuestions() + "\n\n";
textViewResult.append(content);
}
}
#Override
public void onFailure(Call<List<Post>> call, Throwable t) {
textViewResult.setText(t.getMessage());
}
});
here is an example of the json data:
[
{
"questions":[...],
"_id":"5f42954a7e252b48ec3564b6",
"name":"Lifestyle",
"doctor":"doctoremail#gmail.com",
"__v":0
},
{
"questions":[...],
"_id":"5f4299687e252b48ec3564b7",
"name":"Headache",
"doctor":"doctoremail#gmail.com",
"__v":0
},
{
"questions":[...],
"_id":"5f429b2f7e252b48ec3564b9",
"name":"Foot pain",
"doctor":"doctoremail#gmail.com",
"__v":0
}
]

I fixed it. the problem was that the 'questions' property in my model was of type string in stead of List String
package com.example.medlog;
import java.util.List;
public class Post {
private String name;
private String doctor;
private List<String> questions;
public String getName() {
return name;
}
public String getDoctor() {
return doctor;
}
public List<String> getQuestions() {
return questions;
}
}

Failed to show the output from json object

I want to parse json from json object and put it on textview. I tried some method but failed. The error:
expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $
API SERVICE: Full ver http://139.255.86.189:83/service/api/checklistpertanyaan/1
{
"success": true,
"data": [
{
"idRchecklistpompa": "1",
"nmChecklist": "Membersihkan Body Pompa"
},
{
"idRchecklistpompa": "2",
"nmChecklist": "Membersihkan Kabel Tray Pompa"
},
Harian.java
public class Harian {
#SerializedName("idRchecklistpompa")
#Expose
private String idRchecklistpompa;
#SerializedName("nmChecklist")
#Expose
private String nmChecklist;
public String getIdRchecklistpompa() {
return idRchecklistpompa;
}
public String getNmChecklist() {
return nmChecklist;
}
public void setIdRchecklistpompa(String idRchecklistpompa) {
this.idRchecklistpompa = idRchecklistpompa;
}
public void setNmChecklist(String nmChecklist) {
this.nmChecklist = nmChecklist;
}
}
MainActivity.java
public class HarianActivity extends AppCompatActivity {
private TextView textViewResult;
/*private static String url = "http://139.255.86.189:83/service/api/checklistpertanyaan/1";*/
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_harian);
textViewResult = findViewById(R.id.text_view_result);
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("http://139.255.86.189:83/service/api/")
.addConverterFactory(GsonConverterFactory.create())
.build();
HarianApi harianApi = retrofit.create(HarianApi.class);
Call<List<Harian>> call = harianApi.getHarian();
call.enqueue(new Callback<List<Harian>>() {
#Override
public void onResponse(Call<List<Harian>> call, Response<List<Harian>> response) {
if (!response.isSuccessful()) {
textViewResult.setText("CodeL " + response.code());
return;
}
List<Harian> harians = response.body();
for (Harian harian : harians) {
String content = "";
content += "ID " + harian.getIdRchecklistpompa() + "\n";
content += "NAMA " + harian.getNmChecklist() + "\n";
textViewResult.append(content);
}
}
#Override
public void onFailure(Call<List<Harian>> call, Throwable t) {
textViewResult.setText(t.getMessage());
}
});
}
}

I would expect JSON that encapsulated a List of Harians to look like this:
[
{
"idRchecklistpompa": "1",
"nmChecklist": "Membersihkan Body Pompa"
},
{
"idRchecklistpompa": "2",
"nmChecklist": "Membersihkan Kabel Tray Pompa"
}
]
Instead, yours begins with:
{
"success": true,
"data": [
...
So it isn't correct for your API to return List<Harian>. Instead, your API should return a different class which looks more like:
public class Container {
#SerializedName("success")
private boolean success;
#SerializedName("data")
List<Harian> data;
public static class Harian {
#SerializedName("idRchecklistpompa")
#Expose
private String idRchecklistpompa;
#SerializedName("nmChecklist")
#Expose
private String nmChecklist;
public String getIdRchecklistpompa() {
return idRchecklistpompa;
}
public String getNmChecklist() {
return nmChecklist;
}
public void setIdRchecklistpompa(String idRchecklistpompa) {
this.idRchecklistpompa = idRchecklistpompa;
}
public void setNmChecklist(String nmChecklist) {
this.nmChecklist = nmChecklist;
}
}
}
And have your Retrofit API return Container rather than List<Harian>

Not sure if I understand but, to debug the problem what I would do is:
1.- Check as a String that response is a well formed JSON String.
Log.d(TAG, "My JSON String: " + response.code());
1.5.- Check if that string is a JSONObject or a JSONArray
2.- Probably try to create a JSONObject/JSONArray from that String to see if it triggers an exception.
try {
JSONObject jsonObject = new JSONObject(response.code());
} catch (JSONException e) {
e.printStackTrace();
}
3.- Try to parse the JSONObject but checking for exceptions:
try {
String nmChecklist = jsonObject.getString("nmChecklist");
} catch (JSONException e) {
e.printStackTrace();
}
4.- If you want to avoid exceptions since some objects may or may not have a key or value:
String nmChecklist = jsonObject.has("nmChecklist") && !jsonObject.isNull("nmChecklist") ? jsonObject.getString("nmChecklist") : null;
I hope this helps.

I think there is some problem with your class. The response is different from your pojo class. See json to pojo and create your Model as per the generated pojo.

Retrofit response.body() is null, but API JSON visible in Logcat

I have my Android Java REST API code working perfectly with another REST API that uses a JSON object hierarchy (aka List-bracket-object1-bracket object2). Now I moved on to a simplified API (googlemaps timezone - just one simple object with 5 fields) but I cannot figure out how to get the google data into my object.
I am getting status code 200, I can see the googlemaps output/JSON in my logcat but my object is null. I read this post "0 Retrofit 2: response.body() is null, but status code is 200 2" and I am sure I have the same problem but I do not know how to adjust my object model to fix it. Here is my stuff...
1 - API/URL I am hitting:
https://maps.googleapis.com/maps/api/timezone/json?location=39.6034810,-119.6822510&timestamp=1331161200&key=xxxxxx
2 - What the API/URL returns (from my LogCat)
D/OkHttp: {
D/OkHttp: "dstOffset" : 0,
D/OkHttp: "rawOffset" : -28800,
D/OkHttp: "status" : "OK",
D/OkHttp: "timeZoneId" : "America/Los_Angeles",
D/OkHttp: "timeZoneName" : "Pacific Standard Time"
D/OkHttp: }
3 - Logcat showing object is null
Log.e(" main ", " apt " + response.body().getResults());
E/ main: apt null
4 - The calling routine
ApiInterface apiService = ApiClient.getClient(1).create(ApiInterface.class);
Call<ApiTimes> call = apiService.getTime(location,epoch,GOOG_TZ_KEY);
call.enqueue(new Callback<ApiTimes>() {
#Override
public void onResponse(Call<ApiTimes> call, Response<ApiTimes> response) {
int statusCode = response.code();
Log.e(" main ", " apt " + response.body().getResults());
}
#Override
public void onFailure(Call<ApiTimes> call, Throwable t) {
Log.e(" getFS ", t.toString());
}
});
5 - The object.
public class ApiTime {
#SerializedName("apitime")
private ApiTime apitime;
#SerializedName("dstOffset")
#Expose
private Long dstOffset;
#SerializedName("rawOffset")
#Expose
private Long rawOffset;
#SerializedName("status")
#Expose
private String status;
#SerializedName("timeZoneId")
#Expose
private String timeZoneId;
#SerializedName("timeZoneName")
#Expose
private String timeZoneName;
public ApiTime(Long dstOffset, Long rawOffset, String status, String timeZoneId, String timeZoneName) {
this.dstOffset = dstOffset ;
this.rawOffset = rawOffset ;
this.status = status ;
this.timeZoneId = timeZoneId ;
this.timeZoneName = timeZoneName ;
}
public ApiTime getResults() {
return apitime;
}
public void setResults(ApiTime apitimes) {
this.apitime = apitime;
}
public Long getDstOffset() {
return dstOffset;
}
public void setDstOffset(Long dstOffset) {
this.dstOffset = dstOffset;
}
public Long getRawOffset() {
return rawOffset;
}
public void setRawOffset(Long rawOffset) {
this.rawOffset = rawOffset;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public String getTimeZoneId() {
return timeZoneId;
}
public void setTimeZoneId(String timeZoneId) {
this.timeZoneId = timeZoneId;
}
public String getTimeZoneName() {
return timeZoneName;
}
public void setTimeZoneName(String timeZoneName) {
this.timeZoneName = timeZoneName;
}
#Override
public String toString() {
return "ApiTime{" +
"dstOffset=" + dstOffset +
", rawOffset=" + rawOffset +
", status='" + status + '\'' +
", timeZoneId='" + timeZoneId + '\'' +
", timeZoneName='" + timeZoneName + '\'' +
'}';
}
}
6 - Here are the two invocation routines:
public class ApiClient {
public static final String URL0 = blah blah
public static final String URL1 = "https://maps.googleapis.com/maps/api/timezone/";
private static Retrofit retrofit = null;
public static String BASE_URL = "www.google.com";
public static Retrofit getClient(int url) {
BASE_URL = URL0;
if (url == 1){
BASE_URL = URL1;
}
//The following block of code generates OkHttpClient loggging to LogCat.
//Only use if debugging.
OkHttpClient.Builder client = new OkHttpClient.Builder();
HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
client.addInterceptor(loggingInterceptor);
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.client(client.build())
.addConverterFactory(GsonConverterFactory.create())
.build();
//Retrofit retrofit = new Retrofit.Builder()
// .baseUrl(BASE_URL)
// .addConverterFactory(GsonConverterFactory.create())
// .build();
return retrofit;
}
}
public interface ApiInterface {
#GET("json")
Call<ApiTimes> getTime(#Query("location") String location, #Query("timestamp") String timestamp, #Query("key") String key);
}

Looks like you should use ApiTime instead of ApiTimes
I don't see #SerializedName("apitimes") in your json in logs
public interface ApiInterface {
#GET("json")
Call<ApiTime> getTime(#Query("location") String location, #Query("timestamp") String timestamp, #Query("key") String key);
}
-
ApiInterface apiService = ApiClient.getClient(1).create(ApiInterface.class);
Call<ApiTime> call = apiService.getTime(location, epoch, GOOG_TZ_KEY);
call.enqueue(new Callback<ApiTime>() {
#Override
public void onResponse(Call<ApiTime> call, Response<ApiTime> response) {
int statusCode = response.code();
Log.e("main", "apt " + response.body());
}
#Override
public void onFailure(Call<ApiTime> call, Throwable t) {
Log.e("getFS ", t.toString());
}
});
-
public class ApiTime {
#SerializedName("dstOffset")
private Long dstOffset;
#SerializedName("rawOffset")
private Long rawOffset;
#SerializedName("status")
private String status;
#SerializedName("timeZoneId")
private String timeZoneId;
#SerializedName("timeZoneName")
private String timeZoneName;
// getters here
}

Gson to parse string of arrays

I need to parse the below JSON content. Currently I have stored it inflat file and reading it. I have given the sample POJO classes which are created and the code which I tried below.
Tried two different approach and both are giving the following error
Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 3 path $
Json file
{
"DeviceCommon": {
"ASIdentifier": "123",
"DatadeliveyMechanism": "notify",
"MobileOriginatorCallbackReference": {
"url": "http://application.example.com/inbound/notifications/modatanotification/"
},
"AccessiblityCallbackReference": {
"url": "http://application.example.com/inbound/notifications/accessibilitystatusnotification"
}
},
"DeviceList": [{
"ExternalIdentifer": "123456#mydomain.com",
"msisdn": "123456",
"senderName": "Device1",
"MobileOriginatorCallbackReference": {
"notifyURL": "http://application.example.com/inbound/notifications/modatanotification/"
},
"ConfigurationResultCallbackReference": {
"notifyURL": "http://application.example.com/inbound/notifications/configurationResult"
},
"ASreferenceID": "AS000001",
"NIDDduration": "1d"
}]
}
POJO classes:
Note: I have mentioned only two classes here.
package com.As.jsonmodel.configrequest;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
#JsonIgnoreProperties(ignoreUnknown = true)
public class ConfigurationRequest
{
private DeviceList[] DeviceList;
private DeviceCommon DeviceCommon;
public DeviceList[] getDeviceList ()
{
return DeviceList;
}
public void setDeviceList (DeviceList[] DeviceList)
{
this.DeviceList = DeviceList;
}
public DeviceCommon getDeviceCommon ()
{
return DeviceCommon;
}
public void setDeviceCommon (DeviceCommon DeviceCommon)
{
this.DeviceCommon = DeviceCommon;
}
#Override
public String toString()
{
return "ClassPojo [DeviceList = "+DeviceList+", DeviceCommon = "+DeviceCommon+"]";
}
}
package com.As.jsonmodel.configrequest;
public class DeviceList
{
private MobileOriginatorCallbackReference MobileOriginatorCallbackReference;
private String NIDDduration;
private String ASreferenceID;
private String senderName;
private String ExternalIdentifer;
private String msisdn;
private ConfigurationResultCallbackReference ConfigurationResultCallbackReference;
public MobileOriginatorCallbackReference getMobileOriginatorCallbackReference ()
{
return MobileOriginatorCallbackReference;
}
public void setMobileOriginatorCallbackReference (MobileOriginatorCallbackReference MobileOriginatorCallbackReference)
{
this.MobileOriginatorCallbackReference = MobileOriginatorCallbackReference;
}
public String getNIDDduration ()
{
return NIDDduration;
}
public void setNIDDduration (String NIDDduration)
{
this.NIDDduration = NIDDduration;
}
public String getASreferenceID ()
{
return ASreferenceID;
}
public void setASreferenceID (String ASreferenceID)
{
this.ASreferenceID = ASreferenceID;
}
public String getSenderName ()
{
return senderName;
}
public void setSenderName (String senderName)
{
this.senderName = senderName;
}
public String getExternalIdentifer ()
{
return ExternalIdentifer;
}
public void setExternalIdentifer (String ExternalIdentifer)
{
this.ExternalIdentifer = ExternalIdentifer;
}
public String getMsisdn ()
{
return msisdn;
}
public void setMsisdn (String msisdn)
{
this.msisdn = msisdn;
}
public ConfigurationResultCallbackReference getConfigurationResultCallbackReference ()
{
return ConfigurationResultCallbackReference;
}
public void setConfigurationResultCallbackReference (ConfigurationResultCallbackReference ConfigurationResultCallbackReference)
{
this.ConfigurationResultCallbackReference = ConfigurationResultCallbackReference;
}
#Override
public String toString()
{
return "ClassPojo [MobileOriginatorCallbackReference = "+MobileOriginatorCallbackReference+", NIDD duration = "+NIDDduration+", AS referenceID = "+ASreferenceID+", senderName = "+senderName+", ExternalIdentifer = "+ExternalIdentifer+", msisdn = "+msisdn+", ConfigurationResultCallbackReference = "+ConfigurationResultCallbackReference+"]";
}
}
Json Reader
Approach1:
BufferedReader br = null;
try {
br = new BufferedReader(
new FileReader("/home/raj/apache-tomcat-8.0.3/webapps/file.json"));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
JsonReader jsonReader = new JsonReader(new FileReader("/home/raj/apache-tomcat-8.0.3/webapps/file.json"));
jsonReader.beginObject();
while (jsonReader.hasNext()) {
String name = jsonReader.nextName();
if (name.equals("DeviceCommon")) {
readApp(jsonReader);
}
}
jsonReader.endObject();
jsonReader.close();
}
public static void readApp(JsonReader jsonReader) throws IOException{
jsonReader.beginObject();
while (jsonReader.hasNext()) {
String name = jsonReader.nextName();
System.out.println(name);
if (name.contains("ASIdentifier")){
jsonReader.beginObject();
while (jsonReader.hasNext()) {
String n = jsonReader.nextName();
if (n.equals("MobileOriginatorCallbackReference")){
System.out.println(jsonReader.nextString());
}
if (n.equals("AccessiblityCallbackReference")){
System.out.println(jsonReader.nextInt());
}
if (n.equals("DeviceList")){
jsonReader.beginArray();
while (jsonReader.hasNext()) {
System.out.println(jsonReader.nextString());
}
jsonReader.endArray();
}
}
jsonReader.endObject();
}
}
jsonReader.endObject();
}
// TODO Auto-generated method stub
Aproach2:
Gson gson = new Gson();
DeviceList [] myTypes = gson.fromJson(new FileReader("/home/raj/apache-tomcat-8.0.3/webapps/file.json"), DeviceList[].class);
System.out.println(gson.toJson(myTypes));
Any pointers on how to parse this file will be helpful.

Here's how to do it with Gson:
import java.io.FileReader;
import java.util.Arrays;
import com.google.gson.Gson;
import com.google.gson.annotations.SerializedName;
public class Main {
public static void main(String[] args) throws Exception {
Data data = new Gson().fromJson(new FileReader("data.json"), Data.class);
System.out.println(data);
}
}
class Data {
#SerializedName("DeviceCommon")
DeviceCommon deviceCommon;
#SerializedName("DeviceList")
DeviceListEntry[] deviceList;
#Override
public String toString() {
return "Data{" +
"\n deviceCommon=" + deviceCommon +
"\n deviceList=" + Arrays.toString(deviceList) +
"\n}";
}
}
class DeviceCommon {
#SerializedName("ASIdentifier")
String asIdentifier;
#SerializedName("DatadeliveyMechanism")
String datadeliveyMechanism;
#SerializedName("MobileOriginatorCallbackReference")
Url mobileOriginatorCallbackReference;
#SerializedName("AccessiblityCallbackReference")
Url accessiblityCallbackReference;
#Override
public String toString() {
return "DeviceCommon{" +
"\n asIdentifier='" + asIdentifier + '\'' +
"\n datadeliveyMechanism='" + datadeliveyMechanism + '\'' +
"\n mobileOriginatorCallbackReference=" + mobileOriginatorCallbackReference +
"\n accessiblityCallbackReference=" + accessiblityCallbackReference +
"\n }";
}
}
class DeviceListEntry {
#SerializedName("ExternalIdentifer")
String externalIdentifer;
String msisdn;
String senderName;
#SerializedName("MobileOriginatorCallbackReference")
NotifyUrl mobileOriginatorCallbackReference;
#SerializedName("ConfigurationResultCallbackReference")
NotifyUrl configurationResultCallbackReference;
#SerializedName("ASreferenceID")
String asReferenceID;
#SerializedName("NIDDduration")
String nidDduration;
#Override
public String toString() {
return "DeviceListEntry{" +
"\n externalIdentifer='" + externalIdentifer + '\'' +
"\n msisdn='" + msisdn + '\'' +
"\n senderName='" + senderName + '\'' +
"\n mobileOriginatorCallbackReference=" + mobileOriginatorCallbackReference +
"\n configurationResultCallbackReference=" + configurationResultCallbackReference +
"\n asReferenceID='" + asReferenceID + '\'' +
"\n nidDduration='" + nidDduration + '\'' +
"\n }";
}
}
class Url {
String url;
#Override
public String toString() {
return url;
}
}
class NotifyUrl {
String notifyURL;
#Override
public String toString() {
return notifyURL;
}
}
Running Main will result in the following output:
Data{
deviceCommon=DeviceCommon{
asIdentifier='123'
datadeliveyMechanism='notify'
mobileOriginatorCallbackReference=http://application.example.com/inbound/notifications/modatanotification/
accessiblityCallbackReference=http://application.example.com/inbound/notifications/accessibilitystatusnotification
}
deviceList=[DeviceListEntry{
externalIdentifer='123456#mydomain.com'
msisdn='123456'
senderName='Device1'
mobileOriginatorCallbackReference=http://application.example.com/inbound/notifications/modatanotification/
configurationResultCallbackReference=http://application.example.com/inbound/notifications/configurationResult
asReferenceID='AS000001'
nidDduration='1d'
}]
}

Parsing Json Data from Url- Null Values Return - Java

I am using Eclipse IDE to parse the Json data from URl but everty time i run this code it returns null values.
This is the json data from URL
{
"userId": 1,
"id": 1,
"title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
"body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto"
}
This is the POJO class
package com.beto.test.json;
public class Data {
private String id;
private String body;
private String title;
private String userId;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getBody() {
return body;
}
public void setBody(String body) {
this.body = body;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
#Override
public String toString() {
return "ClassPojo [id = " + id + ", body = " + body + ", title = " + title + ", userId = " + userId + "]";
}
}
JsonParserUrl.java class
package com.beto.test.json;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.List;
import java.util.Objects;
/**
* Created by BeytullahC on 23.03.2015.
*/
public class JsonParserFromUrl {
public static void main(String[] args) {
DefaultHttpClient httpClient = null;
try {
httpClient = new DefaultHttpClient();
HttpResponse response = getResponse("http://jsonplaceholder.typicode.com/posts", httpClient);
String outPut = readData(response);
System.out.println(outPut);
Gson gson = new Gson();
List<Data> fromJson = gson.fromJson(outPut, new TypeToken<List<Data>>(){}.getType());
System.out.println("DATA SIZE : "+fromJson.size());
System.out.println("GET FIRST DATA : "+fromJson.get(0));
} catch (Exception e) {
e.printStackTrace();
} finally {
httpClient.getConnectionManager().shutdown();
}
}
public static HttpResponse getResponse(String url, DefaultHttpClient httpClient) throws IOException {
try {
HttpGet httpGet = new HttpGet(url);
httpGet.addHeader("accept", "application/json");
HttpResponse response = httpClient.execute(httpGet);
return response;
} catch (IOException e) {
throw e;
}
}
public static String readData(HttpResponse response) throws Exception {
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(
response.getEntity().getContent()));
StringBuffer data = new StringBuffer();
char[] dataLength = new char[1024];
int read;
while (((read = reader.read(dataLength)) != -1)) {
data.append(dataLength, 0, read);
}
return data.toString();
} finally {
if (reader != null)
reader.close();
}
}
}
TestRunner.java class
package com.beto.test.json;
public class TestRunner {
public static void main(String[] args) {
// TODO Auto-generated method stub
try{
Data data = JsonParserfromUrl.getData("http://jsonplaceholder.typicode.com/posts/1");
System.out.println("result:\n" +data);
}
catch(Exception e)
{
System.out.println("error");
}
}}
Liberaries Added :
- gson-2.3.1.jar
- httpclient-4.5.jar
- commons-logging-1.1.1.jar
- httpclient-cache-4.4.jar
- httpmime-4.0.jar
- commons-codec-1.1.jar
- httpcore-4.4.jar
OUTPUT
ClassPojo [id = " null ", body = " null ", title = " null ", userId ="null"]
Please solve this problem , it should not return null values.

First you should get the JSON String and then parse it to the Data class.
String yourJsonString = readUrl("http://jsonplaceholder.typicode.com/posts/1");
Gson gson = new Gson();
Data data = gson.fromJson(yourJsonString, Data.class);