Error when using DocumentReferences with Ektorp and JSF

Error when using DocumentReferences with Ektorp and JSF - java

I have been getting an error with DocumentReferences in a small JSF project i created to learn CouchDB/Ektorp .
I belive everything is working as is should in the CRUD, the id of the parent document is stored as a string, similar to the tutorial project.
But when I retrieve the parent object from the database I get this error:
org.codehaus.jackson.map.JsonMappingException: Can not instantiate value of type
[simple type, class com.pro.documents.Apple] from JSON String; no single-String
constructor/factory method (through reference chain: com.pro.documents.Eiere["apple"])
Here is the rest of the code:
{
"_id": "_design/Eiere",
"_rev": "17-ebb06b0d3102622a3d9849b9399cd94f",
"language": "javascript",
"views": {
"all": {
"map": "function(doc){if (doc.type == 'eiere') {emit(doc._id, doc);}}"
},
"ektorp_docrefs_apple": {
"map": "function(doc){ if(doc.eiere){emit([doc.eiere, 'apple', doc.kategori], null);}}"
}
}
}
{
"_id": "_design/Apple",
"_rev": "8-e04d8b5633776545b9eacdc998db4aea",
"language": "javascript",
"views": {
"all": {
"map": "function(doc){ if(doc.type == 'apple'){emit(doc._id, doc);}}"
}
}
}
public class Eiere extends CouchDbDocument {
#TypeDiscriminator
private String type;
private String navn;
private String telefon;
#DocumentReferences(backReference = "eiere", fetch = FetchType.LAZY, descendingSortOrder = true)
private Set<Apple> apple;
private Date dateCreated;
public Set<Apple> getApple() {
return apple;
}
public void setApple(Set<Apple> apples) {
this.apple = apples;
}
public void addApple(Apple c) {
Assert.notNull(c, "Apple may not be null");
if (getApple() == null) {
apple = new TreeSet<Apple>();
}
c.setEiere(this.getId());
apple.add(c);
}
public String getType() {
if (type == null) {
type = "eiere";
}
return type;
}
public void setType(String type) {
this.type = type;
}
public String getNavn() {
return navn;
}
public void setNavn(String navn) {
this.navn = navn;
}
public String getTelefon() {
return telefon;
}
public void setTelefon(String telefon) {
this.telefon = telefon;
}
public Date getDateCreated() {
return dateCreated;
}
public void setDateCreated(Date dateCreated) {
this.dateCreated = dateCreated;
}
}
public class Apple extends CouchDbDocument implements Comparable<Apple>{
private static final long serialVersionUID = 1L;
#TypeDiscriminator
private String type;
private List<String> prices;
private String kategori;
private String eiere;
private Date dateCreated;
public String getType() {
if(type == null){
type = "apple";
}
return type;
}
public void setType(String type) {
this.type = type;
}
public List<String> getPrices() {
if(prices == null){
prices = new ArrayList<String>();
prices.add(0, " ");
prices.add(1, " ");
prices.add(2, " ");
}
return prices;
}
public void setPrices(List<String> prices) {
this.prices = prices;
}
public String getKategori() {
return kategori;
}
public void setKategori(String kategori) {
this.kategori = kategori;
}
public String getEiere() {
return eiere;
}
public void setEiere(String eiere) {
this.eiere = eiere;
}
#Override
public String toString() {
return prices.toString();
}
public Date getDateCreated() {
return dateCreated;
}
public void setDateCreated(Date dateCreated) {
this.dateCreated = dateCreated;
}
#Override
public int compareTo(Apple other) {
if (other == this) return 0;
if (dateCreated != null) {
return - dateCreated.compareTo(other.dateCreated);
}
return 0;
}
}
Any help or advice to help me understand what I'm doing wrong will be much appreciated.
Edit: If there is any information that I could add that would make my problem clearer or help in determining the cause of it please let me know.
Br.

Related

Receive array of objects in JSON by Spring Boot RestApi Controller

I want to send array of objects like this to Spring REST Controller:
{
"measureList": [
{
"apiKey": "exampleKEY",
"stationId": "abcdef123",
"date": "2022-02-18T17:43:51.787535Z",
"temp": "20.5",
"humidity": "60.4",
"pressure": "1020.5",
"pm25": "100.0",
"pm25Corr": "150.0",
"pm10": "90.0"
},
{
"apiKey": "exampleKEY",
"stationId": "abcdef123",
"date": "2022-02-18T17:43:53.254309Z",
"temp": "20.5",
"humidity": "60.4",
"pressure": "1020.5",
"pm25": "100.0",
"pm25Corr": "150.0",
"pm10": "90.0"
}
]
}
I have created NewMeausurePackageDto like this:
package com.weather.server.domain.dto;
import java.util.ArrayList;
import java.util.List;
public class NewMeasurePackageDto {
private ArrayList<NewMeasureDto> measureList;
public NewMeasurePackageDto(ArrayList<NewMeasureDto> measureList) {
this.measureList = measureList;
}
public NewMeasurePackageDto() {
}
public ArrayList<NewMeasureDto> getNewMeasureListDto() {
return measureList;
}
#Override
public String toString() {
return "NewMeasurePackageDto{" +
"measureList=" + measureList +
'}';
}
}
NewMeasureDto class:
package com.weather.server.domain.dto;
public class NewMeasureDto {
private String apiKey;
private String stationId;
private String date;
private String temp;
private String humidity;
private String pressure;
private String pm25;
private String pm10;
private String pm25Corr;
//station_id
public NewMeasureDto() {
}
private NewMeasureDto(Builder builder){
apiKey = builder.apiKey;
stationId = builder.stationId;
date = builder.date;
temp = builder.temp;
humidity = builder.humidity;
pressure = builder.pressure;
pm25 = builder.pm25;
pm10 = builder.pm10;
pm25Corr = builder.pm25Corr;
}
public String getApiKey() {
return apiKey;
}
public String getStationID() {
return stationId;
}
public String getDate() {
return date;
}
public String getTemp() {
return temp;
}
public String getHumidity() {
return humidity;
}
public String getPressure() {
return pressure;
}
public String getPm25() {
return pm25;
}
public String getPm10() {
return pm10;
}
public String getPm25Corr() {
return pm25Corr;
}
public static final class Builder {
private String apiKey;
private String stationId;
private String date;
private String temp;
private String humidity;
private String pressure;
private String pm25;
private String pm10;
private String pm25Corr;
public Builder() {
}
public Builder apiKey(String apiKey) {
this.apiKey = apiKey;
return this;
}
public Builder stationID(String stationId) {
this.stationId = stationId;
return this;
}
public Builder date(String date) {
this.date = date;
return this;
}
public Builder temp(String temp) {
this.temp = temp;
return this;
}
public Builder humidity(String humidity) {
this.humidity = humidity;
return this;
}
public Builder pressure(String pressure){
this.pressure = pressure;
return this;
}
public Builder pm25(String pm25){
this.pm25 = pm25;
return this;
}
public Builder pm10(String pm10){
this.pm10 = pm10;
return this;
}
public Builder pm25Corr(String pm25Corr){
this.pm25Corr = pm25Corr;
return this;
}
public NewMeasureDto build() {
return new NewMeasureDto(this);
}
}
}
And request mapping in RestController:
#PostMapping(value="/new-measure-package") //addStation id
public ResponseEntity<Void> newMeasure(#RequestBody NewMeasurePackageDto measureList){
//if api key is valid
return measureService.saveMeasurePackage(measureList.getNewMeasureListDto()) ? new ResponseEntity<>(HttpStatus.OK) :
new ResponseEntity<>(HttpStatus.BAD_REQUEST);
}
With this code all I got is error about null measureList in Service function when trying to iterate over the list. I tried changing #RequestBody to
List<NewMeasureDto> measureList, and to Map<String, NewMeasureDto> measureList but still measureList is null or empty.

Thanks to ShaharT suggestion I found the answer.
There was missing setter in NewMeasurePackageDto, the class should look like this:
package com.weather.server.domain.dto;
import java.util.ArrayList;
public class NewMeasurePackageDto {
private ArrayList<NewMeasureDto> measureList;
public NewMeasurePackageDto(ArrayList<NewMeasureDto> measureList) {
this.measureList = measureList;
}
public NewMeasurePackageDto() {
}
public ArrayList<NewMeasureDto> getMeasureList() {
return measureList;
}
public void setMeasureList(ArrayList<NewMeasureDto> measureList) {
this.measureList = measureList;
}
#Override
public String toString() {
return "NewMeasurePackageDto{" +
"measureList=" + measureList +
'}';
}
}
Conclusion is: when dealing with object of arrays in JSON, there must be setter method for variable storing list in DTO.

Java 17 java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.time.ZoneOffset

I have been trying to convert a json string to variables my java program can use but when i run this it doesnt work.
(responseString is a valid json string)
GetConversion conversion = new ObjectMapper().readValue(responseString, GetConversion.class);
class GetConversion{
private State state;
private Swupdate swupdate;
private String type;
private String name;
private String modelid;
private String manufacturername;
private String productname;
private Capabilities capabilities;
private Config config;
private String uniqueid;
private String swversion;
private String swconfigid;
private String productid;
public State getState() { return state; }
public void setState(State value) { this.state = value; }
public Swupdate getSwupdate() { return swupdate; }
public void setSwupdate(Swupdate value) { this.swupdate = value; }
public String getType() { return type; }
public void setType(String value) { this.type = value; }
public String getName() { return name; }
public void setName(String value) { this.name = value; }
public String getModelid() { return modelid; }
public void setModelid(String value) { this.modelid = value; }
public String getManufacturername() { return manufacturername; }
public void setManufacturername(String value) { this.manufacturername = value; }
public String getProductname() { return productname; }
public void setProductname(String value) { this.productname = value; }
public Capabilities getCapabilities() { return capabilities; }
public void setCapabilities(Capabilities value) { this.capabilities = value; }
public Config getConfig() { return config; }
public void setConfig(Config value) { this.config = value; }
public String getUniqueid() { return uniqueid; }
public void setUniqueid(String value) { this.uniqueid = value; }
public String getSwversion() { return swversion; }
public void setSwversion(String value) { this.swversion = value; }
public String getSwconfigid() { return swconfigid; }
public void setSwconfigid(String value) { this.swconfigid = value; }
public String getProductid() { return productid; }
public void setProductid(String value) { this.productid = value; }
}
class Capabilities {
private boolean certified;
private Control control;
private Streaming streaming;
public boolean getCertified() { return certified; }
public void setCertified(boolean value) { this.certified = value; }
public Control getControl() { return control; }
public void setControl(Control value) { this.control = value; }
public Streaming getStreaming() { return streaming; }
public void setStreaming(Streaming value) { this.streaming = value; }
}
class Control {
private long mindimlevel;
private long maxlumen;
private String colorgamuttype;
private double[][] colorgamut;
private CT ct;
public long getMindimlevel() { return mindimlevel; }
public void setMindimlevel(long value) { this.mindimlevel = value; }
public long getMaxlumen() { return maxlumen; }
public void setMaxlumen(long value) { this.maxlumen = value; }
public String getColorgamuttype() { return colorgamuttype; }
public void setColorgamuttype(String value) { this.colorgamuttype = value; }
public double[][] getColorgamut() { return colorgamut; }
public void setColorgamut(double[][] value) { this.colorgamut = value; }
public CT getCT() { return ct; }
public void setCT(CT value) { this.ct = value; }
}
class CT {
private long min;
private long max;
public long getMin() { return min; }
public void setMin(long value) { this.min = value; }
public long getMax() { return max; }
public void setMax(long value) { this.max = value; }
}
class Streaming {
private boolean renderer;
private boolean proxy;
public boolean getRenderer() { return renderer; }
public void setRenderer(boolean value) { this.renderer = value; }
public boolean getProxy() { return proxy; }
public void setProxy(boolean value) { this.proxy = value; }
}
class Config {
private String archetype;
private String function;
private String direction;
private Startup startup;
public String getArchetype() { return archetype; }
public void setArchetype(String value) { this.archetype = value; }
public String getFunction() { return function; }
public void setFunction(String value) { this.function = value; }
public String getDirection() { return direction; }
public void setDirection(String value) { this.direction = value; }
public Startup getStartup() { return startup; }
public void setStartup(Startup value) { this.startup = value; }
}
class Startup {
private String mode;
private boolean configured;
public String getMode() {
return mode;
}
public void setMode(String value) {
this.mode = value;
}
public boolean getConfigured() {
return configured;
}
public void setConfigured(boolean value) {
this.configured = value;
}
}
class State {
private boolean on;
private long bri;
private long hue;
private long sat;
private String effect;
private double[] xy;
private long ct;
private String alert;
private String colormode;
private String mode;
private boolean reachable;
public boolean getOn() { return on; }
public void setOn(boolean value) { this.on = value; }
public long getBri() { return bri; }
public void setBri(long value) { this.bri = value; }
public long getHue() { return hue; }
public void setHue(long value) { this.hue = value; }
public long getSat() { return sat; }
public void setSat(long value) { this.sat = value; }
public String getEffect() { return effect; }
public void setEffect(String value) { this.effect = value; }
public double[] getXy() { return xy; }
public void setXy(double[] value) { this.xy = value; }
public long getCT() { return ct; }
public void setCT(long value) { this.ct = value; }
public String getAlert() { return alert; }
public void setAlert(String value) { this.alert = value; }
public String getColormode() { return colormode; }
public void setColormode(String value) { this.colormode = value; }
public String getMode() { return mode; }
public void setMode(String value) { this.mode = value; }
public boolean getReachable() { return reachable; }
public void setReachable(boolean value) { this.reachable = value; }
}
class Swupdate {
private String state;
private OffsetDateTime lastinstall;
public String getState() { return state; }
public OffsetDateTime getLastinstall() { return lastinstall; }
}
I believe it may have something to do with the last part of the code "public OffsetDateTime getLastinstall() { return lastinstall; }" because the error mentions java.time.OffsetDateTime and this is where that is called.
When I run this it gives a this error:
Exception in thread "main" java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.time.ZoneOffset java.time.OffsetDateTime.offset accessible: module java.base does not "opens java.time" to unnamed module #3578436e
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178)
at java.base/java.lang.reflect.Field.setAccessible(Field.java:172)
at com.fasterxml.jackson.databind.util.ClassUtil.checkAndFixAccess(ClassUtil.java:891)
at com.fasterxml.jackson.databind.deser.impl.FieldProperty.fixAccess(FieldProperty.java:102)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBuilder._fixAccess(BeanDeserializerBuilder.java:484)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBuilder.build(BeanDeserializerBuilder.java:350)
at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.buildBeanDeserializer(BeanDeserializerFactory.java:245)
at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.createBeanDeserializer(BeanDeserializerFactory.java:137)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer2(DeserializerCache.java:411)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer(DeserializerCache.java:349)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:264)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244)
at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142)
at com.fasterxml.jackson.databind.DeserializationContext.findNonContextualValueDeserializer(DeserializationContext.java:467)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.resolve(BeanDeserializerBase.java:473)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:293)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244)
at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142)
at com.fasterxml.jackson.databind.DeserializationContext.findNonContextualValueDeserializer(DeserializationContext.java:467)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.resolve(BeanDeserializerBase.java:473)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:293)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244)
at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142)
at com.fasterxml.jackson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:477)
at com.fasterxml.jackson.databind.ObjectMapper._findRootDeserializer(ObjectMapper.java:4190)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4009)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3004)
at sendCommands.Loft.runGet(Loft.java:141)
at sendCommands.Loft.routine(Loft.java:103)
at sendCommands.Main.main(Main.java:7)
Help fix this pls. The json I used for response string is :
{
"state": {
"on": true,
"bri": 198,
"hue": 25360,
"sat": 254,
"effect": "none",
"xy": [
0.1749,
0.6963
],
"ct": 500,
"alert": "none",
"colormode": "xy",
"mode": "homeautomation",
"reachable": true
},
"swupdate": {
"state": "noupdates",
"lastinstall": "2021-08-13T13:51:54"
},
"type": "Extended color light",
"name": "Hue color spot 6",
"modelid": "LCG002",
"manufacturername": "Signify Netherlands B.V.",
"productname": "Hue color spot",
"capabilities": {
"certified": true,
"control": {
"mindimlevel": 200,
"maxlumen": 300,
"colorgamuttype": "C",
"colorgamut": [
[
0.6915,
0.3083
],
[
0.17,
0.7
],
[
0.1532,
0.0475
]
],
"ct": {
"min": 153,
"max": 500
}
},
"streaming": {
"renderer": true,
"proxy": true
}
},
"config": {
"archetype": "spotbulb",
"function": "mixed",
"direction": "downwards",
"startup": {
"mode": "safety",
"configured": true
}
},
"uniqueid": "00:17:88:01:08:3f:fb:56-0b",
"swversion": "1.88.2",
"swconfigid": "4AF23F6F",
"productid": "Philips-LCG002-1-GU10ECLv2"
}

It looks to me like it's a problem with Jackson attempting to serialize an OffsetDateTime field - it's trying to access the OffsetDateTime's private 'offset' property.
Jackson needs to be told how to serialize OffsetDateTime properly.
You can either add another Jackson library dependency to take care of this, or write a custom object mapper, if you need a format not provided by the library.
See Jackson date-format for OffsetDateTime in Spring Boot

I encountered a similar issue when I was unit testing Twilio SMS.
I solved the issue by registering JavaTimeModule on the ObjectMapper.
String json = "{\"status\": \"sent\"}";
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new JavaTimeModule());
var message = Message.fromJson(json, mapper);

json data should be print in specified textview

I have json data regarding student details,That i want to print in respective textviews. i'm new to json services please help me to print the this data on screen.I'm using getters and setters for subject score so further i want to use them dynamically.
here is my json data
{
"studentInfo": {
"studentName": "srini#gmail.com",
"studentId": "abc",
"date": 14102017,
"JanuaryScoreCard" : {
"english" : "44",
"Science" : "45",
"maths": "66",
"social" : "56",
"hindi" : "67",
"kannada" : "78",
},
"MarchScoreCard" : {
" english " : "54",
" Science " : "56",
" maths ": "70",
" social " : "87",
" hindi " : "98",
" kannada " : "56"
},
"comments" : ""
}
I'm Something to print but could not,i don't where i'm going wrong
public void init()
{
try {
parseJSON();
} catch (JSONException e)
{
e.printStackTrace();
}
}
public void parseJSON() throws JSONException{
jsonObject = new JSONObject(strJson);
JSONObject object = jsonObject.getJSONObject("studentInfo");
patientName = object.getString("studentName");
patientID = object.getString("studentId");
mName.setText(studentName);
mUserId.setText(studentId);
}

You can use JSON parser and then you can print any data you want from that,
Use GSON for this, here is an example https://www.javacodegeeks.com/2011/01/android-json-parsing-gson-tutorial.html

Here is a basic JSON Parsing process
public void parseJson() {
String your_response = "replace this with your response";
try {
JSONObject jsonObject = new JSONObject(your_response);
JSONObject studentInfoJsonObject = jsonObject.getJSONObject("studentInfo");
StudentInfo studentInfo1 = new StudentInfo();
studentInfo1.setStudentName(studentInfoJsonObject.optString("studentName"));
studentInfo1.setStudentId(studentInfoJsonObject.optString("studentId"));
studentInfo1.setDate(studentInfoJsonObject.optString("date"));
studentInfo1.setComments(studentInfoJsonObject.optString("comments"));
JSONObject januaryScoreCardJsonObject = studentInfoJsonObject.optJSONObject("JanuaryScoreCard");
JanuaryScoreCard januaryScoreCard1 = new JanuaryScoreCard();
januaryScoreCard1.setEnglish(januaryScoreCardJsonObject.optString("english"));
januaryScoreCard1.setHindi(januaryScoreCardJsonObject.optString("hindi"));
januaryScoreCard1.setMaths(januaryScoreCardJsonObject.optString("maths"));
januaryScoreCard1.setSocial(januaryScoreCardJsonObject.optString("social"));
januaryScoreCard1.setKannada(januaryScoreCardJsonObject.optString("kannada"));
januaryScoreCard1.setScience(januaryScoreCardJsonObject.optString("Science"));
JSONObject marchScoreCardJsonObject = studentInfoJsonObject.optJSONObject("JanuaryScoreCard");
MarchScoreCard marchScoreCard = new MarchScoreCard();
marchScoreCard.setEnglish(marchScoreCardJsonObject.optString("english"));
marchScoreCard.setHindi(marchScoreCardJsonObject.optString("hindi"));
marchScoreCard.setMaths(marchScoreCardJsonObject.optString("maths"));
marchScoreCard.setSocial(marchScoreCardJsonObject.optString("social"));
marchScoreCard.setKannada(marchScoreCardJsonObject.optString("kannada"));
marchScoreCard.setScience(marchScoreCardJsonObject.optString("Science"));
studentInfo1.setJanuaryScoreCard(januaryScoreCard1);
studentInfo1.setMarchScoreCard(marchScoreCard);
} catch (JSONException e) {
e.printStackTrace();
}
}
Student Info Class
public class StudentInfo {
private String studentName;
private String studentId;
private String date;
private String comments;
private JanuaryScoreCard januaryScoreCard;
private MarchScoreCard marchScoreCard;
public JanuaryScoreCard getJanuaryScoreCard() {
return januaryScoreCard;
}
public void setJanuaryScoreCard(JanuaryScoreCard januaryScoreCard) {
this.januaryScoreCard = januaryScoreCard;
}
public MarchScoreCard getMarchScoreCard() {
return marchScoreCard;
}
public void setMarchScoreCard(MarchScoreCard marchScoreCard) {
this.marchScoreCard = marchScoreCard;
}
public String getStudentName() {
return studentName;
}
public void setStudentName(String studentName) {
this.studentName = studentName;
}
public String getStudentId() {
return studentId;
}
public void setStudentId(String studentId) {
this.studentId = studentId;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getComments() {
return comments;
}
public void setComments(String comments) {
this.comments = comments;
}
}
and Here is January class
public class JanuaryScoreCard {
private String english;
private String Science;
private String maths;
private String kannada;
private String social;
private String hindi;
public String getEnglish() {
return english;
}
public void setEnglish(String english) {
this.english = english;
}
public String getScience() {
return Science;
}
public void setScience(String science) {
Science = science;
}
public String getMaths() {
return maths;
}
public void setMaths(String maths) {
this.maths = maths;
}
public String getKannada() {
return kannada;
}
public void setKannada(String kannada) {
this.kannada = kannada;
}
public String getSocial() {
return social;
}
public void setSocial(String social) {
this.social = social;
}
public String getHindi() {
return hindi;
}
public void setHindi(String hindi) {
this.hindi = hindi;
}
}
and Here is March Class
public class MarchScoreCard{
private String english;
private String Science;
private String maths;
private String kannada;
private String social;
private String hindi;
public String getEnglish() {
return english;
}
public void setEnglish(String english) {
this.english = english;
}
public String getScience() {
return Science;
}
public void setScience(String science) {
Science = science;
}
public String getMaths() {
return maths;
}
public void setMaths(String maths) {
this.maths = maths;
}
public String getKannada() {
return kannada;
}
public void setKannada(String kannada) {
this.kannada = kannada;
}
public String getSocial() {
return social;
}
public void setSocial(String social) {
this.social = social;
}
public String getHindi() {
return hindi;
}
public void setHindi(String hindi) {
this.hindi = hindi;
}
}

You need to parse this json Data , For this you need Create appropriate bean classes and put data while parsing json into this bean classes object and create List .
Then you need to create ListView and Adapter for populate data into Screen or Activity.

Jackson: Parsing an object with an array of objects

I'm working on a project where I'm integrating with a 3rd party service that returns a JSON response. I am using Jackson to deserialize the response into a Java POJO. The response is an object that has a few simple fields that Jackson is able to easily parse. However the response also contains an array with a single entry that is also an object. When Jackson attempts to deserialize it I get the top level object containing a list with the single entry in the list, however all of the fields for the single entry in the list are null. Any idea what I'm doing wrong here?
UPDATE: after setting FAIL_ON_UNKNOWN_PROPERTIES to true, I am getting the following stack trace. Still not sure why it is having issues with the wrapped "RecurringDetail" object in the array.
com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "RecurringDetail" (class com.adyen.www.models.RecurringDetail), not marked as ignorable (19 known properties: "variant", "contractTypes", "tokenDetails", "aliasType", "name", "creationDate", "firstPspReference", "elv", "card", "additionalData", "shopperName", "socialSecurityNumber", "billingAddress", "bank", "recurringDetailReference", "paymentMethodVariant", "alias", "acquirer", "acquirerAccount"])
at [Source: response.json; line: 5, column: 33] (through reference chain: com.adyen.www.models.RecurringDetailsResult["details"]->java.util.ArrayList[0]->com.adyen.www.models.RecurringDetail["RecurringDetail"])
at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:62)
at com.fasterxml.jackson.databind.DeserializationContext.handleUnknownProperty(DeserializationContext.java:834)
at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:1094)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1470)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownVanilla(BeanDeserializerBase.java:1448)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:282)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:287)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:259)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:26)
at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:499)
at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:101)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:276)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3798)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2759)
JSON
{
"creationDate": "2017-01-26T23:11:20+01:00",
"details": [
{
"RecurringDetail": {
"acquirer": "TestPmmAcquirer",
"acquirerAccount": "TestPmmAcquirerAccount",
"additionalData": {
"cardBin": "440000"
},
"alias": "B133243153928547",
"aliasType": "Default",
"card": {
"expiryMonth": "8",
"expiryYear": "2018",
"holderName": "Steve HAll",
"number": "0008"
},
"contractTypes": [
"RECURRING"
],
"creationDate": "2017-01-26T23:11:20+01:00",
"firstPspReference": "8524854686798738",
"paymentMethodVariant": "visadebit",
"recurringDetailReference": "8414854686802111",
"variant": "visa"
}
}
],
"invalidOneclickContracts": "false",
"lastKnownShopperEmail": "someones#email.com",
"shopperReference": "xggZcGauSSG5jP+akIlijQ=="
}
Unit Test
public class RecurringDetailResultTest {
public static ObjectMapper mapper = new ObjectMapper()
{
private static final long serialVersionUID = -174113593500315394L;
{
configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
configure(DeserializationFeature.UNWRAP_SINGLE_VALUE_ARRAYS, true);
setSerializationInclusion(JsonInclude.Include.NON_NULL);
}
};
#Test
public void testParseRecurringDetailResulte() throws IOException {
RecurringDetailsResult result = mapper.readValue(new File("response.json"), new TypeReference<RecurringDetailsResult>(){});
if (result.getDetails() != null && !result.getDetails().isEmpty()) {
RecurringDetail detail = result.getDetails().get(0);
if (StringUtils.isEmpty(detail.getRecurringDetailReference())) {
fail("Recurring detail does not contain any information.");
}
} else {
fail("No result details returned.");
}
}
}
Model (Root object)
public class RecurringDetailsResult
implements java.io.Serializable {
private static final long serialVersionUID = 5297684963950973136L;
private Date creationDate;
private String shopperReference;
private List<RecurringDetail> details;
private String lastKnownShopperEmail;
#JsonGetter("creationDate")
public Date getCreationDate ( ) {
return this.creationDate;
}
#JsonSetter("creationDate")
public void setCreationDate (Date value) {
this.creationDate = value;
}
#JsonGetter("shopperReference")
public String getShopperReference ( ) {
return this.shopperReference;
}
#JsonSetter("shopperReference")
public void setShopperReference (String value) {
this.shopperReference = value;
}
#JsonGetter("details")
public List<RecurringDetail> getDetails ( ) {
return this.details;
}
#JsonSetter("details")
public void setDetails (List<RecurringDetail> value) {
this.details = value;
}
#JsonGetter("lastKnownShopperEmail")
public String getLastKnownShopperEmail ( ) {
return this.lastKnownShopperEmail;
}
#JsonSetter("lastKnownShopperEmail")
public void setLastKnownShopperEmail (String value) {
this.lastKnownShopperEmail = value;
}
}
Model (the object in the array, all of the fields of this guy are null when Jackson deserializes the JSON)
public class RecurringDetail
implements java.io.Serializable {
private static final long serialVersionUID = 5302883242997268343L;
private String name;
private Date creationDate;
private Card card;
private ELV elv;
private Address billingAddress;
private String additionalData;
private Name shopperName;
private String socialSecurityNumber;
private String recurringDetailReference;
private BankAccount bank;
private String alias;
private String aliasType;
private TokenDetails tokenDetails;
private String variant;
private String paymentMethodVariant;
private String firstPspReference;
private List<String> contractTypes;
private String acquirer;
private String acquirerAccount;
#JsonGetter("name")
public String getName ( ) {
return this.name;
}
#JsonSetter("name")
public void setName (String value) {
this.name = value;
}
#JsonGetter("creationDate")
public Date getCreationDate ( ) {
return this.creationDate;
}
#JsonSetter("creationDate")
public void setCreationDate (Date value) {
this.creationDate = value;
}
#JsonGetter("card")
public Card getCard ( ) {
return this.card;
}
#JsonSetter("card")
public void setCard (Card value) {
this.card = value;
}
#JsonGetter("elv")
public ELV getElv ( ) {
return this.elv;
}
#JsonSetter("elv")
public void setElv (ELV value) {
this.elv = value;
}
#JsonGetter("billingAddress")
public Address getBillingAddress ( ) {
return this.billingAddress;
}
#JsonSetter("billingAddress")
public void setBillingAddress (Address value) {
this.billingAddress = value;
}
#JsonGetter("additionalData")
public String getAdditionalData ( ) {
return this.additionalData;
}
#JsonSetter("additionalData")
public void setAdditionalData (String value) {
this.additionalData = value;
}
#JsonGetter("shopperName")
public Name getShopperName ( ) {
return this.shopperName;
}
#JsonSetter("shopperName")
public void setShopperName (Name value) {
this.shopperName = value;
}
#JsonGetter("socialSecurityNumber")
public String getSocialSecurityNumber ( ) {
return this.socialSecurityNumber;
}
#JsonSetter("socialSecurityNumber")
public void setSocialSecurityNumber (String value) {
this.socialSecurityNumber = value;
}
#JsonGetter("recurringDetailReference")
public String getRecurringDetailReference ( ) {
return this.recurringDetailReference;
}
#JsonSetter("recurringDetailReference")
public void setRecurringDetailReference (String value) {
this.recurringDetailReference = value;
}
#JsonGetter("bank")
public BankAccount getBank ( ) {
return this.bank;
}
#JsonSetter("bank")
public void setBank (BankAccount value) {
this.bank = value;
}
#JsonGetter("alias")
public String getAlias ( ) {
return this.alias;
}
#JsonSetter("alias")
public void setAlias (String value) {
this.alias = value;
}
#JsonGetter("aliasType")
public String getAliasType ( ) {
return this.aliasType;
}
#JsonSetter("aliasType")
public void setAliasType (String value) {
this.aliasType = value;
}
#JsonGetter("tokenDetails")
public TokenDetails getTokenDetails ( ) {
return this.tokenDetails;
}
#JsonSetter("tokenDetails")
public void setTokenDetails (TokenDetails value) {
this.tokenDetails = value;
}
#JsonGetter("variant")
public String getVariant ( ) {
return this.variant;
}
#JsonSetter("variant")
public void setVariant (String value) {
this.variant = value;
}
#JsonGetter("paymentMethodVariant")
public String getPaymentMethodVariant ( ) {
return this.paymentMethodVariant;
}
#JsonSetter("paymentMethodVariant")
public void setPaymentMethodVariant (String value) {
this.paymentMethodVariant = value;
}
#JsonGetter("firstPspReference")
public String getFirstPspReference ( ) {
return this.firstPspReference;
}
#JsonSetter("firstPspReference")
public void setFirstPspReference (String value) {
this.firstPspReference = value;
}
#JsonGetter("contractTypes")
public List<String> getContractTypes ( ) {
return this.contractTypes;
}
#JsonSetter("contractTypes")
public void setContractTypes (List<String> value) {
this.contractTypes = value;
}
#JsonGetter("acquirer")
public String getAcquirer ( ) {
return this.acquirer;
}
#JsonSetter("acquirer")
public void setAcquirer (String value) {
this.acquirer = value;
}
#JsonGetter("acquirerAccount")
public String getAcquirerAccount ( ) {
return this.acquirerAccount;
}
#JsonSetter("acquirerAccount")
public void setAcquirerAccount (String value) {
this.acquirerAccount = value;
}
}

The easiest thing I can think to do is to make your java objects look like your Json. Because this Json has a wrapped inner object but not the outer object you would have to have a similar wrapping in java. It isn't elegant but works.
public class RecurringDetailsResult implements java.io.Serializable {
private Date creationDate;
private String shopperReference;
private List<RecurringDetailWrapper> details;
private String lastKnownShopperEmail;
// getters and setters here. No need for any #JsonGetter or #JsonSetter annotations
}
#JsonRootName("RecurringDetail")
public class RecurringDetailWrapper {
#JsonProperty("RecurringDetail")
RecurringDetail recurringDetail;
public RecurringDetail getRecurringDetail() {
return recurringDetail;
}
public void setRecurringDetail(RecurringDetail recurringDetail) {
this.recurringDetail = recurringDetail;
}
}
public class RecurringDetail implements java.io.Serializable {
private static final long serialVersionUID = 5302883242997268343L;
private String name;
private Date creationDate;
private Card card;
private AdditionalData additionalData;
private String socialSecurityNumber;
private String recurringDetailReference;
private String alias;
private String aliasType;
private String variant;
private String paymentMethodVariant;
private String firstPspReference;
private List<String> contractTypes;
private String acquirer;
private String acquirerAccount;
public class AdditionalData {
String cardBin;
public String getCardBin() {
return cardBin;
}
public void setCardBin(String cardBin) {
this.cardBin = cardBin;
}
}
// getters and setters here. No need for any #JsonGetter or #JsonSetter annotations
}
Then in your unit test:
#Test
public void testParseRecurringDetailResulte() throws IOException {
InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("ID41901838.json");
ObjectReader objectReader = mapper.readerFor(RecurringDetailsResult.class);
RecurringDetailsResult result = objectReader.readValue(inputStream);
if (result.getDetails() != null && !result.getDetails().isEmpty()) {
RecurringDetailWrapper detail = result.getDetails().get(0);
if (StringUtils.isEmpty(detail.getRecurringDetail().getRecurringDetailReference())) {
fail("Recurring detail does not contain any information.");
}
} else {
fail("No result details returned.");
}
}
I posted the full working code here:
https://github.com/teacurran/java-experiments/tree/master/stackoverflow-sandbox/src/main/java/com/wirelust/stackoverflowsandbox/ID41901838

It seems your current structure will work for the response JSON as below (an extra named layer is removed)
{
"creationDate": "2017-01-26T23:11:20+01:00",
"details": [
{
"acquirer": "TestPmmAcquirer",
"acquirerAccount": "TestPmmAcquirerAccount",
"additionalData": {
"cardBin": "440000"
},
"alias": "B133243153928547",
"aliasType": "Default",
"card": {
"expiryMonth": "8",
"expiryYear": "2018",
"holderName": "Steve HAll",
"number": "0008"
},
"contractTypes": [
"RECURRING"
],
"creationDate": "2017-01-26T23:11:20+01:00",
"firstPspReference": "8524854686798738",
"paymentMethodVariant": "visadebit",
"recurringDetailReference": "8414854686802111",
"variant": "visa"
}
],
"invalidOneclickContracts": "false",
"lastKnownShopperEmail": "someones#email.com",
"shopperReference": "xggZcGauSSG5jP+akIlijQ=="
}
For named object maybe you can try something like
public class RecurringDetailsResult
implements java.io.Serializable {
private static final long serialVersionUID = 5297684963950973136L;
private Date creationDate;
private String shopperReference;
private List<Map<String,RecurringDetail>> details;
private String lastKnownShopperEmail;
#JsonGetter("creationDate")
public Date getCreationDate ( ) {
return this.creationDate;
}
#JsonSetter("creationDate")
public void setCreationDate (Date value) {
this.creationDate = value;
}
#JsonGetter("shopperReference")
public String getShopperReference ( ) {
return this.shopperReference;
}
#JsonSetter("shopperReference")
public void setShopperReference (String value) {
this.shopperReference = value;
}
#JsonGetter("details")
public List<Map<String, RecurringDetail>> getDetails ( ) {
return this.details;
}
#JsonSetter("details")
public void setDetails (List<Map<String, RecurringDetail>> value) {
this.details = value;
}
#JsonGetter("lastKnownShopperEmail")
public String getLastKnownShopperEmail ( ) {
return this.lastKnownShopperEmail;
}
#JsonSetter("lastKnownShopperEmail")
public void setLastKnownShopperEmail (String value) {
this.lastKnownShopperEmail = value;
}
}

Model Class for the given GoogleBooks API

I am new to android and I am creating an app to learn JSON Parsing. I want to parse the Google Books API's JSON data for my app, but I am having trouble creating the Model class for the API. Here is the JSON data for the for first result displayed in the data:
{
"kind": "books#volumes",
"totalItems": 1591,
"items": [
{
"kind": "books#volume",
"id": "An4_e3Cr3zAC",
"etag": "DWmqBRkB8dw",
"selfLink": "https://www.googleapis.com/books/v1/volumes/An4_e3Cr3zAC",
"volumeInfo": {
"title": "The Rules of the Game",
"authors": [
"Neil Strauss"
],
"publisher": "Canongate Books",
"publishedDate": "2011-09-29",
"description": "If you want to play The Game you need to know The Rules This book is not a story. It is a how-to book. This Stylelife Challenge is not meant to be read. It is meant to be performed. Whatever experience level you have, whatever strengths and weaknesses you may have, whether you're a virgin or a Don Juan, the stage has been set for you to perform at your highest capacity. The Stylelife Challenge is a simple, easy-to-follow guide to the basics of approaching and attracting women. The Challenge is simply what works best and fastest. Neil Strauss spent four years gathering this knowledge, living it and sharing it. He's tested the specific material in this book on over 13,000 men of varying ages, nationalities and backgrounds. Part practical application and part sequel, this is the further adventures of Style and his game techniques. The result: A month-long workout program for your social, attraction, dating and seduction skills.",
"industryIdentifiers": [
{
"type": "ISBN_13",
"identifier": "9781847673558"
},
{
"type": "ISBN_10",
"identifier": "1847673554"
}
],
"readingModes": {
"text": true,
"image": true
},
"pageCount": 352,
"printType": "BOOK",
"categories": [
"Biography & Autobiography"
],
"averageRating": 3.5,
"ratingsCount": 82,
"maturityRating": "NOT_MATURE",
"allowAnonLogging": true,
"contentVersion": "1.7.6.0.preview.3",
"imageLinks": {
"smallThumbnail": "http://books.google.co.in/books/content?id=An4_e3Cr3zAC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api",
"thumbnail": "http://books.google.co.in/books/content?id=An4_e3Cr3zAC&printsec=frontcover&img=1&zoom=1&edge=curl&source=gbs_api"
},
"language": "en",
"previewLink": "http://books.google.co.in/books?id=An4_e3Cr3zAC&printsec=frontcover&dq=game&hl=&cd=1&source=gbs_api",
"infoLink": "http://books.google.co.in/books?id=An4_e3Cr3zAC&dq=game&hl=&source=gbs_api",
"canonicalVolumeLink": "http://books.google.co.in/books/about/The_Rules_of_the_Game.html?hl=&id=An4_e3Cr3zAC"
},
"saleInfo": {
"country": "IN",
"saleability": "FOR_SALE",
"isEbook": true,
"listPrice": {
"amount": 399.0,
"currencyCode": "INR"
},
"retailPrice": {
"amount": 279.3,
"currencyCode": "INR"
},
"buyLink": "http://books.google.co.in/books?id=An4_e3Cr3zAC&dq=game&hl=&buy=&source=gbs_api",
"offers": [
{
"finskyOfferType": 1,
"listPrice": {
"amountInMicros": 3.99E8,
"currencyCode": "INR"
},
"retailPrice": {
"amountInMicros": 2.793E8,
"currencyCode": "INR"
}
}
]
},
"accessInfo": {
"country": "IN",
"viewability": "PARTIAL",
"embeddable": true,
"publicDomain": false,
"textToSpeechPermission": "ALLOWED",
"epub": {
"isAvailable": true,
"acsTokenLink": "http://books.google.co.in/books/download/The_Rules_of_the_Game-sample-epub.acsm?id=An4_e3Cr3zAC&format=epub&output=acs4_fulfillment_token&dl_type=sample&source=gbs_api"
},
"pdf": {
"isAvailable": true,
"acsTokenLink": "http://books.google.co.in/books/download/The_Rules_of_the_Game-sample-pdf.acsm?id=An4_e3Cr3zAC&format=pdf&output=acs4_fulfillment_token&dl_type=sample&source=gbs_api"
},
"webReaderLink": "http://books.google.co.in/books/reader?id=An4_e3Cr3zAC&hl=&printsec=frontcover&output=reader&source=gbs_api",
"accessViewStatus": "SAMPLE",
"quoteSharingAllowed": false
},
"searchInfo": {
"textSnippet": "He's tested the specific material in this book on over 13,000 men of varying ages, nationalities and backgrounds. Part practical application and part sequel, this is the further adventures of Style and his game techniques."
}
}
]
}
I created four Model classes (as I saw fit). Here is the code of all four classes. All the classes contains their respective setters and getters.
public class BookItems {
String kind;
String id;
String etag;
String selfLink;
}
public class BookVolumeInfo {
String title;
String publisher;
String publishedDate;
String description;
long pageCount;
float averageRating;
long ratingsCount;
String maturityRating;
}
public class BookAuthors {
String authors;
}
public class BookCategories {
String categories;
}
I want to do this all in one class if possible. And when I ran the code I am not getting the title of the book. Here is the Main code of my project.
public class MainActivity extends AppCompatActivity {
public static final String Logcat = "vmech";
Button searchButton;
EditText editTextSearch;
TextView textViewDisplayResult;
String newText;
String urlstring;
public static final String MyAPIKey = "Your_Api_Key";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
searchButton = (Button) findViewById(R.id.buttonSerch);
editTextSearch = (EditText) findViewById(R.id.editTextSearch);
textViewDisplayResult = (TextView) findViewById(R.id.textViewDisplayResult);
searchButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
newText = editTextSearch.getText().toString();
if(newText.length()>0){
newText = newText.replace(" ", "+");
urlstring = "https://www.googleapis.com/books/v1/volumes?q=";
urlstring = urlstring + newText + "&maxResults=5" + "&key=" + MyAPIKey;
// Log.e(Logcat,"URL created successfully");
// Log.i(Logcat,"URL created successfully");
}
else {
Toast.makeText(MainActivity.this, "Please enter a book name to search.", Toast.LENGTH_LONG).show();
// Log.e(Logcat,"Search field empty");
// Log.i(Logcat,"Search field empty");
}
new JSONTask().execute(urlstring);
//Toast.makeText(MainActivity.this, "Search Button Clicked.", Toast.LENGTH_LONG).show();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
//super.onCreateOptionsMenu(menu);
MenuInflater inflater=getMenuInflater();
inflater.inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
Toast.makeText(this, "This is the Settings item", Toast.LENGTH_LONG).show();
return true;
}
public class JSONTask extends AsyncTask<String, String, List<BookVolumeInfo>>{
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected List<BookVolumeInfo> doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader bufferedReader = null;
// URL url = null;
try {
URL url = new URL(urlstring);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream inputstream = connection.getInputStream();
bufferedReader = new BufferedReader(new InputStreamReader(inputstream));
StringBuffer stringbuffer = new StringBuffer();
String line = "";
while ((line = bufferedReader.readLine()) != null) {
stringbuffer.append(line);
}
String finalJson = stringbuffer.toString();
JSONObject parentObject = new JSONObject(finalJson);
JSONArray parentArray = parentObject.getJSONArray("items");
List<BookVolumeInfo> bookVolumeInfoList = new ArrayList<>();
for(int i=0; i<parentArray.length(); i++){
JSONObject finalObject = parentArray.getJSONObject(i);
BookVolumeInfo bookVolumeInfo = new BookVolumeInfo();
BookAuthors bookAuthors = new BookAuthors();
BookCategories bookCategories = new BookCategories();
bookVolumeInfo.setTitle(finalObject.getString("title"));
bookVolumeInfo.setDescription(finalObject.getString("description"));
bookVolumeInfo.setAverageRating((float) finalObject.getDouble("averageRating"));
bookAuthors.setAuthors(finalObject.getString("authors"));
bookCategories.setCategories(finalObject.getString("categories"));
bookVolumeInfoList.add(bookVolumeInfo);
}
return bookVolumeInfoList;
} catch (IOException e){
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
} finally {
if (connection != null)
{
connection.disconnect();
}
try {
if (bufferedReader != null){
bufferedReader.close();
}
}catch (IOException e){
e.printStackTrace();
}
}
return null;
}
#Override
protected void onPostExecute(List<BookVolumeInfo> result) {
super.onPostExecute(result);
textViewDisplayResult.setText((CharSequence) result);
}
}
}
When I am running the code it is not giving any errors but when I am searching for the book it says in the Android Monitor window, "title cannot be found".
Please help.

Generate Model Class from here

Here is the full implementation of your json body to a java class
public class DemoClass {
private Items[] items;
private String totalItems;
private String kind;
public Items[] getItems ()
{
return items;
}
public void setItems (Items[] items)
{
this.items = items;
}
public String getTotalItems ()
{
return totalItems;
}
public void setTotalItems (String totalItems)
{
this.totalItems = totalItems;
}
public String getKind ()
{
return kind;
}
public void setKind (String kind)
{
this.kind = kind;
}
public class Items
{
private SaleInfo saleInfo;
private String id;
private SearchInfo searchInfo;
private String etag;
private VolumeInfo volumeInfo;
private String selfLink;
private AccessInfo accessInfo;
private String kind;
public SaleInfo getSaleInfo ()
{
return saleInfo;
}
public void setSaleInfo (SaleInfo saleInfo)
{
this.saleInfo = saleInfo;
}
public String getId ()
{
return id;
}
public void setId (String id)
{
this.id = id;
}
public SearchInfo getSearchInfo ()
{
return searchInfo;
}
public void setSearchInfo (SearchInfo searchInfo)
{
this.searchInfo = searchInfo;
}
public String getEtag ()
{
return etag;
}
public void setEtag (String etag)
{
this.etag = etag;
}
public VolumeInfo getVolumeInfo ()
{
return volumeInfo;
}
public void setVolumeInfo (VolumeInfo volumeInfo)
{
this.volumeInfo = volumeInfo;
}
public String getSelfLink ()
{
return selfLink;
}
public void setSelfLink (String selfLink)
{
this.selfLink = selfLink;
}
public AccessInfo getAccessInfo ()
{
return accessInfo;
}
public void setAccessInfo (AccessInfo accessInfo)
{
this.accessInfo = accessInfo;
}
public String getKind ()
{
return kind;
}
public void setKind (String kind)
{
this.kind = kind;
}
public class SearchInfo
{
private String textSnippet;
public String getTextSnippet ()
{
return textSnippet;
}
public void setTextSnippet (String textSnippet)
{
this.textSnippet = textSnippet;
}
}
public class AccessInfo
{
private String webReaderLink;
private String textToSpeechPermission;
private String publicDomain;
private String viewability;
private String accessViewStatus;
private Pdf pdf;
private Epub epub;
private String embeddable;
private String quoteSharingAllowed;
private String country;
public String getWebReaderLink ()
{
return webReaderLink;
}
public void setWebReaderLink (String webReaderLink)
{
this.webReaderLink = webReaderLink;
}
public String getTextToSpeechPermission ()
{
return textToSpeechPermission;
}
public void setTextToSpeechPermission (String textToSpeechPermission)
{
this.textToSpeechPermission = textToSpeechPermission;
}
public String getPublicDomain ()
{
return publicDomain;
}
public void setPublicDomain (String publicDomain)
{
this.publicDomain = publicDomain;
}
public String getViewability ()
{
return viewability;
}
public void setViewability (String viewability)
{
this.viewability = viewability;
}
public String getAccessViewStatus ()
{
return accessViewStatus;
}
public void setAccessViewStatus (String accessViewStatus)
{
this.accessViewStatus = accessViewStatus;
}
public Pdf getPdf ()
{
return pdf;
}
public void setPdf (Pdf pdf)
{
this.pdf = pdf;
}
public Epub getEpub ()
{
return epub;
}
public void setEpub (Epub epub)
{
this.epub = epub;
}
public String getEmbeddable ()
{
return embeddable;
}
public void setEmbeddable (String embeddable)
{
this.embeddable = embeddable;
}
public String getQuoteSharingAllowed ()
{
return quoteSharingAllowed;
}
public void setQuoteSharingAllowed (String quoteSharingAllowed)
{
this.quoteSharingAllowed = quoteSharingAllowed;
}
public String getCountry ()
{
return country;
}
public void setCountry (String country)
{
this.country = country;
}
public class Pdf
{
private String acsTokenLink;
private String isAvailable;
public String getAcsTokenLink ()
{
return acsTokenLink;
}
public void setAcsTokenLink (String acsTokenLink)
{
this.acsTokenLink = acsTokenLink;
}
public String getIsAvailable ()
{
return isAvailable;
}
public void setIsAvailable (String isAvailable)
{
this.isAvailable = isAvailable;
}
}
public class Epub
{
private String acsTokenLink;
private String isAvailable;
public String getAcsTokenLink ()
{
return acsTokenLink;
}
public void setAcsTokenLink (String acsTokenLink)
{
this.acsTokenLink = acsTokenLink;
}
public String getIsAvailable ()
{
return isAvailable;
}
public void setIsAvailable (String isAvailable)
{
this.isAvailable = isAvailable;
}
}
}
public class SaleInfo
{
private RetailPrice retailPrice;
private String saleability;
private ListPrice listPrice;
private Offers[] offers;
private String buyLink;
private String isEbook;
private String country;
public RetailPrice getRetailPrice ()
{
return retailPrice;
}
public void setRetailPrice (RetailPrice retailPrice)
{
this.retailPrice = retailPrice;
}
public String getSaleability ()
{
return saleability;
}
public void setSaleability (String saleability)
{
this.saleability = saleability;
}
public ListPrice getListPrice ()
{
return listPrice;
}
public void setListPrice (ListPrice listPrice)
{
this.listPrice = listPrice;
}
public Offers[] getOffers ()
{
return offers;
}
public void setOffers (Offers[] offers)
{
this.offers = offers;
}
public String getBuyLink ()
{
return buyLink;
}
public void setBuyLink (String buyLink)
{
this.buyLink = buyLink;
}
public String getIsEbook ()
{
return isEbook;
}
public void setIsEbook (String isEbook)
{
this.isEbook = isEbook;
}
public String getCountry ()
{
return country;
}
public void setCountry (String country)
{
this.country = country;
}
public class Offers
{
private RetailPrice retailPrice;
private ListPrice listPrice;
private String finskyOfferType;
public RetailPrice getRetailPrice ()
{
return retailPrice;
}
public void setRetailPrice (RetailPrice retailPrice)
{
this.retailPrice = retailPrice;
}
public ListPrice getListPrice ()
{
return listPrice;
}
public void setListPrice (ListPrice listPrice)
{
this.listPrice = listPrice;
}
public String getFinskyOfferType ()
{
return finskyOfferType;
}
public void setFinskyOfferType (String finskyOfferType)
{
this.finskyOfferType = finskyOfferType;
}
}
public class RetailPrice
{
private String amount;
private String currencyCode;
public String getAmount ()
{
return amount;
}
public void setAmount (String amount)
{
this.amount = amount;
}
public String getCurrencyCode ()
{
return currencyCode;
}
public void setCurrencyCode (String currencyCode)
{
this.currencyCode = currencyCode;
}
}
public class ListPrice
{
private String amount;
private String currencyCode;
public String getAmount ()
{
return amount;
}
public void setAmount (String amount)
{
this.amount = amount;
}
public String getCurrencyCode ()
{
return currencyCode;
}
public void setCurrencyCode (String currencyCode)
{
this.currencyCode = currencyCode;
}
}
}
public class VolumeInfo
{
private String pageCount;
private String averageRating;
private ReadingModes readingModes;
private String infoLink;
private String printType;
private String allowAnonLogging;
private String publisher;
private String[] authors;
private String canonicalVolumeLink;
private String title;
private String previewLink;
private String description;
private String ratingsCount;
private ImageLinks imageLinks;
private String contentVersion;
private String[] categories;
private String language;
private String publishedDate;
private IndustryIdentifiers[] industryIdentifiers;
private String maturityRating;
public String getPageCount ()
{
return pageCount;
}
public void setPageCount (String pageCount)
{
this.pageCount = pageCount;
}
public String getAverageRating ()
{
return averageRating;
}
public void setAverageRating (String averageRating)
{
this.averageRating = averageRating;
}
public ReadingModes getReadingModes ()
{
return readingModes;
}
public void setReadingModes (ReadingModes readingModes)
{
this.readingModes = readingModes;
}
public String getInfoLink ()
{
return infoLink;
}
public void setInfoLink (String infoLink)
{
this.infoLink = infoLink;
}
public String getPrintType ()
{
return printType;
}
public void setPrintType (String printType)
{
this.printType = printType;
}
public String getAllowAnonLogging ()
{
return allowAnonLogging;
}
public void setAllowAnonLogging (String allowAnonLogging)
{
this.allowAnonLogging = allowAnonLogging;
}
public String getPublisher ()
{
return publisher;
}
public void setPublisher (String publisher)
{
this.publisher = publisher;
}
public String[] getAuthors ()
{
return authors;
}
public void setAuthors (String[] authors)
{
this.authors = authors;
}
public String getCanonicalVolumeLink ()
{
return canonicalVolumeLink;
}
public void setCanonicalVolumeLink (String canonicalVolumeLink)
{
this.canonicalVolumeLink = canonicalVolumeLink;
}
public String getTitle ()
{
return title;
}
public void setTitle (String title)
{
this.title = title;
}
public String getPreviewLink ()
{
return previewLink;
}
public void setPreviewLink (String previewLink)
{
this.previewLink = previewLink;
}
public String getDescription ()
{
return description;
}
public void setDescription (String description)
{
this.description = description;
}
public String getRatingsCount ()
{
return ratingsCount;
}
public void setRatingsCount (String ratingsCount)
{
this.ratingsCount = ratingsCount;
}
public ImageLinks getImageLinks ()
{
return imageLinks;
}
public void setImageLinks (ImageLinks imageLinks)
{
this.imageLinks = imageLinks;
}
public String getContentVersion ()
{
return contentVersion;
}
public void setContentVersion (String contentVersion)
{
this.contentVersion = contentVersion;
}
public String[] getCategories ()
{
return categories;
}
public void setCategories (String[] categories)
{
this.categories = categories;
}
public String getLanguage ()
{
return language;
}
public void setLanguage (String language)
{
this.language = language;
}
public String getPublishedDate ()
{
return publishedDate;
}
public void setPublishedDate (String publishedDate)
{
this.publishedDate = publishedDate;
}
public IndustryIdentifiers[] getIndustryIdentifiers ()
{
return industryIdentifiers;
}
public void setIndustryIdentifiers (IndustryIdentifiers[] industryIdentifiers)
{
this.industryIdentifiers = industryIdentifiers;
}
public String getMaturityRating ()
{
return maturityRating;
}
public void setMaturityRating (String maturityRating)
{
this.maturityRating = maturityRating;
}
public class ImageLinks
{
private String thumbnail;
private String smallThumbnail;
public String getThumbnail ()
{
return thumbnail;
}
public void setThumbnail (String thumbnail)
{
this.thumbnail = thumbnail;
}
public String getSmallThumbnail ()
{
return smallThumbnail;
}
public void setSmallThumbnail (String smallThumbnail)
{
this.smallThumbnail = smallThumbnail;
}
}
public class ReadingModes
{
private String text;
private String image;
public String getText ()
{
return text;
}
public void setText (String text)
{
this.text = text;
}
public String getImage ()
{
return image;
}
public void setImage (String image)
{
this.image = image;
}
}
public class IndustryIdentifiers
{
private String type;
private String identifier;
public String getType ()
{
return type;
}
public void setType (String type)
{
this.type = type;
}
public String getIdentifier ()
{
return identifier;
}
public void setIdentifier (String identifier)
{
this.identifier = identifier;
}
}
}
}
}
More over you can also use Gson(https://github.com/google/gson) to convert json string directly into java pojo objects like,
new Gson().fromJson(finalJson,GoogleBook.class);

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

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