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How to Convert JSON to POJO class?

I checked the following json, it is valid, But http://www.jsonschema2pojo.org/ is not converting it into POJO object so I can fetch values from it, I need "nameValuePairs" object in following model. Please help. Thanks in advance
[
"order-chat-1",
{
"nameValuePairs":{
"chat":{
"nameValuePairs":{
"id":19,
"order_id":6,
"sender_id":10,
"receiver_id":3,
"message":"Hi",
"is_read":0,
"created_at":"2018-10-19 16:23:28",
"updated_at":"2018-10-19 16:23:28",
"is_sender":false
}
},
"message":"Hello from chef",
"message_type":"Message",
"is_sender":false
}
}
]

Here is the code to put on http://www.jsonschema2pojo.org/
{
"type":"object",
"properties":{
"chat":{
"type":"object",
"properties":{
"nameValuePairs":{
"type":"object",
"properties":{
"id": {"type": "integer"},
"order_id":{"type": "integer"},
"sender_id":{"type": "integer"},
"receiver_id":{"type": "integer"},
"message":{"type": "string"},
"is_read":{"type": "integer"},
"created_at":{"type": "string"},
"updated_at":{"type": "string"},
"is_sender":{"type": "boolean"}
}
}
}
},
"message":{"type": "string"},
"message_type":{"type": "string"},
"is_sender":{"type": "boolean"}
}
}
That produces the following POJO's where Example.class is your root object, change the name as you want.
-----------------------------------com.example.Chat.java-----------------------------------
package com.example;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Chat {
#SerializedName("nameValuePairs")
#Expose
private NameValuePairs nameValuePairs;
public NameValuePairs getNameValuePairs() {
return nameValuePairs;
}
public void setNameValuePairs(NameValuePairs nameValuePairs) {
this.nameValuePairs = nameValuePairs;
}
public Chat withNameValuePairs(NameValuePairs nameValuePairs) {
this.nameValuePairs = nameValuePairs;
return this;
}
}
-----------------------------------com.example.Example.java-----------------------------------
package com.example;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Example {
#SerializedName("chat")
#Expose
private Chat chat;
#SerializedName("message")
#Expose
private String message;
#SerializedName("message_type")
#Expose
private String messageType;
#SerializedName("is_sender")
#Expose
private boolean isSender;
public Chat getChat() {
return chat;
}
public void setChat(Chat chat) {
this.chat = chat;
}
public Example withChat(Chat chat) {
this.chat = chat;
return this;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public Example withMessage(String message) {
this.message = message;
return this;
}
public String getMessageType() {
return messageType;
}
public void setMessageType(String messageType) {
this.messageType = messageType;
}
public Example withMessageType(String messageType) {
this.messageType = messageType;
return this;
}
public boolean isIsSender() {
return isSender;
}
public void setIsSender(boolean isSender) {
this.isSender = isSender;
}
public Example withIsSender(boolean isSender) {
this.isSender = isSender;
return this;
}
}
-----------------------------------com.example.NameValuePairs.java-----------------------------------
package com.example;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class NameValuePairs {
#SerializedName("id")
#Expose
private int id;
#SerializedName("order_id")
#Expose
private int orderId;
#SerializedName("sender_id")
#Expose
private int senderId;
#SerializedName("receiver_id")
#Expose
private int receiverId;
#SerializedName("message")
#Expose
private String message;
#SerializedName("is_read")
#Expose
private int isRead;
#SerializedName("created_at")
#Expose
private String createdAt;
#SerializedName("updated_at")
#Expose
private String updatedAt;
#SerializedName("is_sender")
#Expose
private boolean isSender;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public NameValuePairs withId(int id) {
this.id = id;
return this;
}
public int getOrderId() {
return orderId;
}
public void setOrderId(int orderId) {
this.orderId = orderId;
}
public NameValuePairs withOrderId(int orderId) {
this.orderId = orderId;
return this;
}
public int getSenderId() {
return senderId;
}
public void setSenderId(int senderId) {
this.senderId = senderId;
}
public NameValuePairs withSenderId(int senderId) {
this.senderId = senderId;
return this;
}
public int getReceiverId() {
return receiverId;
}
public void setReceiverId(int receiverId) {
this.receiverId = receiverId;
}
public NameValuePairs withReceiverId(int receiverId) {
this.receiverId = receiverId;
return this;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public NameValuePairs withMessage(String message) {
this.message = message;
return this;
}
public int getIsRead() {
return isRead;
}
public void setIsRead(int isRead) {
this.isRead = isRead;
}
public NameValuePairs withIsRead(int isRead) {
this.isRead = isRead;
return this;
}
public String getCreatedAt() {
return createdAt;
}
public void setCreatedAt(String createdAt) {
this.createdAt = createdAt;
}
public NameValuePairs withCreatedAt(String createdAt) {
this.createdAt = createdAt;
return this;
}
public String getUpdatedAt() {
return updatedAt;
}
public void setUpdatedAt(String updatedAt) {
this.updatedAt = updatedAt;
}
public NameValuePairs withUpdatedAt(String updatedAt) {
this.updatedAt = updatedAt;
return this;
}
public boolean isIsSender() {
return isSender;
}
public void setIsSender(boolean isSender) {
this.isSender = isSender;
}
public NameValuePairs withIsSender(boolean isSender) {
this.isSender = isSender;
return this;
}
}

It is valid from JavaScript prospective, but not form standard Java libraries such as GSON, Jackson or whatever www.jsonschema2pojo.org uses.
There are two things:
It is an Array on top
There are two different types in that array String and an Object
It can be converted only to Object[] or Collection<Object> (e.g.List, Set etc).
But to do that you have to have a custom Serializer/Deserializer.

I worked with another technique to resolve this, I converted this Object to String through Gson() and after that with subString method I removed the first 16 characters and the last character of the newly created string, then I Converted that String to POJO Object.

Using GSON to parse an JSON object with an array of elements

How can I use GSON to parse the following JSON object:
{
"ProductsByCategory": [
{.....},
{.....},
{.....},
{.....},
]
}
The JSON object contains an array of elements. I am using GSON to try and parse the JSON and have the following POJO classes to assist me with this.
public class ProductItems {
#SerializedName("ProductsByCategory")
#Expose
private List<ProductsByCategory> productsByCategory = null;
public List<ProductsByCategory> getProductsByCategory() {
return productsByCategory;
}
public void setProductsByCategory(List<ProductsByCategory> productsByCategory) {
this.productsByCategory = productsByCategory;
}
}
public class ProductsByCategory {
#SerializedName("id")
#Expose
private Integer id;
#SerializedName("name")
#Expose
private String name;
#SerializedName("slug")
#Expose
private String slug;
#SerializedName("permalink")
#Expose
private String permalink;
#SerializedName("date_created")
#Expose
private String dateCreated;
#SerializedName("date_created_gmt")
#Expose
private String dateCreatedGmt;
#SerializedName("date_modified")
#Expose
private String dateModified;
#SerializedName("date_modified_gmt")
#Expose
private String dateModifiedGmt;
#SerializedName("type")
#Expose
private String type;
#SerializedName("status")
#Expose
private String status;
#SerializedName("featured")
#Expose
private Boolean featured;
#SerializedName("catalog_visibility")
#Expose
private String catalogVisibility;
#SerializedName("description")
#Expose
private String description;
#SerializedName("short_description")
#Expose
private String shortDescription;
#SerializedName("sku")
#Expose
private String sku;
#SerializedName("price")
#Expose
private String price;
#SerializedName("regular_price")
#Expose
private String regularPrice;
#SerializedName("sale_price")
#Expose
private String salePrice;
#SerializedName("date_on_sale_from")
#Expose
private Object dateOnSaleFrom;
#SerializedName("date_on_sale_from_gmt")
#Expose
private Object dateOnSaleFromGmt;
#SerializedName("date_on_sale_to")
#Expose
private Object dateOnSaleTo;
#SerializedName("date_on_sale_to_gmt")
#Expose
private Object dateOnSaleToGmt;
#SerializedName("price_html")
#Expose
private String priceHtml;
#SerializedName("on_sale")
#Expose
private Boolean onSale;
#SerializedName("purchasable")
#Expose
private Boolean purchasable;
#SerializedName("total_sales")
#Expose
private Integer totalSales;
#SerializedName("virtual")
#Expose
private Boolean virtual;
#SerializedName("downloadable")
#Expose
private Boolean downloadable;
#SerializedName("downloads")
#Expose
private List<Object> downloads = null;
#SerializedName("download_limit")
#Expose
private Integer downloadLimit;
#SerializedName("download_expiry")
#Expose
private Integer downloadExpiry;
#SerializedName("external_url")
#Expose
private String externalUrl;
#SerializedName("button_text")
#Expose
private String buttonText;
#SerializedName("tax_status")
#Expose
private String taxStatus;
#SerializedName("tax_class")
#Expose
private String taxClass;
#SerializedName("manage_stock")
#Expose
private Boolean manageStock;
#SerializedName("stock_quantity")
#Expose
private Integer stockQuantity;
#SerializedName("in_stock")
#Expose
private Boolean inStock;
#SerializedName("backorders")
#Expose
private String backorders;
#SerializedName("backorders_allowed")
#Expose
private Boolean backordersAllowed;
#SerializedName("backordered")
#Expose
private Boolean backordered;
#SerializedName("sold_individually")
#Expose
private Boolean soldIndividually;
#SerializedName("weight")
#Expose
private String weight;
#SerializedName("dimensions")
#Expose
private Dimensions dimensions;
#SerializedName("shipping_required")
#Expose
private Boolean shippingRequired;
#SerializedName("shipping_taxable")
#Expose
private Boolean shippingTaxable;
#SerializedName("shipping_class")
#Expose
private String shippingClass;
#SerializedName("shipping_class_id")
#Expose
private Integer shippingClassId;
#SerializedName("reviews_allowed")
#Expose
private Boolean reviewsAllowed;
#SerializedName("average_rating")
#Expose
private String averageRating;
#SerializedName("rating_count")
#Expose
private Integer ratingCount;
#SerializedName("related_ids")
#Expose
private List<Integer> relatedIds = null;
#SerializedName("upsell_ids")
#Expose
private List<Object> upsellIds = null;
#SerializedName("cross_sell_ids")
#Expose
private List<Object> crossSellIds = null;
#SerializedName("parent_id")
#Expose
private Integer parentId;
#SerializedName("purchase_note")
#Expose
private String purchaseNote;
#SerializedName("categories")
#Expose
private List<Category> categories = null;
#SerializedName("tags")
#Expose
private List<Object> tags = null;
#SerializedName("images")
#Expose
private List<Image> images = null;
#SerializedName("attributes")
#Expose
private List<Attribute> attributes = null;
#SerializedName("default_attributes")
#Expose
private List<Object> defaultAttributes = null;
#SerializedName("variations")
#Expose
private List<Integer> variations = null;
#SerializedName("grouped_products")
#Expose
private List<Object> groupedProducts = null;
#SerializedName("menu_order")
#Expose
private Integer menuOrder;
#SerializedName("meta_data")
#Expose
private List<MetaDatum> metaData = null;
#SerializedName("_links")
#Expose
private Links links;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSlug() {
return slug;
}
public void setSlug(String slug) {
this.slug = slug;
}
public String getPermalink() {
return permalink;
}
public void setPermalink(String permalink) {
this.permalink = permalink;
}
public String getDateCreated() {
return dateCreated;
}
public void setDateCreated(String dateCreated) {
this.dateCreated = dateCreated;
}
public String getDateCreatedGmt() {
return dateCreatedGmt;
}
public void setDateCreatedGmt(String dateCreatedGmt) {
this.dateCreatedGmt = dateCreatedGmt;
}
public String getDateModified() {
return dateModified;
}
public void setDateModified(String dateModified) {
this.dateModified = dateModified;
}
public String getDateModifiedGmt() {
return dateModifiedGmt;
}
public void setDateModifiedGmt(String dateModifiedGmt) {
this.dateModifiedGmt = dateModifiedGmt;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public Boolean getFeatured() {
return featured;
}
public void setFeatured(Boolean featured) {
this.featured = featured;
}
public String getCatalogVisibility() {
return catalogVisibility;
}
public void setCatalogVisibility(String catalogVisibility) {
this.catalogVisibility = catalogVisibility;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getShortDescription() {
return shortDescription;
}
public void setShortDescription(String shortDescription) {
this.shortDescription = shortDescription;
}
public String getSku() {
return sku;
}
public void setSku(String sku) {
this.sku = sku;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public String getRegularPrice() {
return regularPrice;
}
public void setRegularPrice(String regularPrice) {
this.regularPrice = regularPrice;
}
public String getSalePrice() {
return salePrice;
}
public void setSalePrice(String salePrice) {
this.salePrice = salePrice;
}
public Object getDateOnSaleFrom() {
return dateOnSaleFrom;
}
public void setDateOnSaleFrom(Object dateOnSaleFrom) {
this.dateOnSaleFrom = dateOnSaleFrom;
}
public Object getDateOnSaleFromGmt() {
return dateOnSaleFromGmt;
}
public void setDateOnSaleFromGmt(Object dateOnSaleFromGmt) {
this.dateOnSaleFromGmt = dateOnSaleFromGmt;
}
public Object getDateOnSaleTo() {
return dateOnSaleTo;
}
public void setDateOnSaleTo(Object dateOnSaleTo) {
this.dateOnSaleTo = dateOnSaleTo;
}
public Object getDateOnSaleToGmt() {
return dateOnSaleToGmt;
}
public void setDateOnSaleToGmt(Object dateOnSaleToGmt) {
this.dateOnSaleToGmt = dateOnSaleToGmt;
}
public String getPriceHtml() {
return priceHtml;
}
public void setPriceHtml(String priceHtml) {
this.priceHtml = priceHtml;
}
public Boolean getOnSale() {
return onSale;
}
public void setOnSale(Boolean onSale) {
this.onSale = onSale;
}
public Boolean getPurchasable() {
return purchasable;
}
public void setPurchasable(Boolean purchasable) {
this.purchasable = purchasable;
}
public Integer getTotalSales() {
return totalSales;
}
public void setTotalSales(Integer totalSales) {
this.totalSales = totalSales;
}
public Boolean getVirtual() {
return virtual;
}
public void setVirtual(Boolean virtual) {
this.virtual = virtual;
}
public Boolean getDownloadable() {
return downloadable;
}
public void setDownloadable(Boolean downloadable) {
this.downloadable = downloadable;
}
public List<Object> getDownloads() {
return downloads;
}
public void setDownloads(List<Object> downloads) {
this.downloads = downloads;
}
public Integer getDownloadLimit() {
return downloadLimit;
}
public void setDownloadLimit(Integer downloadLimit) {
this.downloadLimit = downloadLimit;
}
public Integer getDownloadExpiry() {
return downloadExpiry;
}
public void setDownloadExpiry(Integer downloadExpiry) {
this.downloadExpiry = downloadExpiry;
}
public String getExternalUrl() {
return externalUrl;
}
public void setExternalUrl(String externalUrl) {
this.externalUrl = externalUrl;
}
public String getButtonText() {
return buttonText;
}
public void setButtonText(String buttonText) {
this.buttonText = buttonText;
}
public String getTaxStatus() {
return taxStatus;
}
public void setTaxStatus(String taxStatus) {
this.taxStatus = taxStatus;
}
public String getTaxClass() {
return taxClass;
}
public void setTaxClass(String taxClass) {
this.taxClass = taxClass;
}
public Boolean getManageStock() {
return manageStock;
}
public void setManageStock(Boolean manageStock) {
this.manageStock = manageStock;
}
public Integer getStockQuantity() {
return stockQuantity;
}
public void setStockQuantity(Integer stockQuantity) {
this.stockQuantity = stockQuantity;
}
public Boolean getInStock() {
return inStock;
}
public void setInStock(Boolean inStock) {
this.inStock = inStock;
}
public String getBackorders() {
return backorders;
}
public void setBackorders(String backorders) {
this.backorders = backorders;
}
public Boolean getBackordersAllowed() {
return backordersAllowed;
}
public void setBackordersAllowed(Boolean backordersAllowed) {
this.backordersAllowed = backordersAllowed;
}
public Boolean getBackordered() {
return backordered;
}
public void setBackordered(Boolean backordered) {
this.backordered = backordered;
}
public Boolean getSoldIndividually() {
return soldIndividually;
}
public void setSoldIndividually(Boolean soldIndividually) {
this.soldIndividually = soldIndividually;
}
public String getWeight() {
return weight;
}
public void setWeight(String weight) {
this.weight = weight;
}
public Dimensions getDimensions() {
return dimensions;
}
public void setDimensions(Dimensions dimensions) {
this.dimensions = dimensions;
}
public Boolean getShippingRequired() {
return shippingRequired;
}
public void setShippingRequired(Boolean shippingRequired) {
this.shippingRequired = shippingRequired;
}
public Boolean getShippingTaxable() {
return shippingTaxable;
}
public void setShippingTaxable(Boolean shippingTaxable) {
this.shippingTaxable = shippingTaxable;
}
public String getShippingClass() {
return shippingClass;
}
public void setShippingClass(String shippingClass) {
this.shippingClass = shippingClass;
}
public Integer getShippingClassId() {
return shippingClassId;
}
public void setShippingClassId(Integer shippingClassId) {
this.shippingClassId = shippingClassId;
}
public Boolean getReviewsAllowed() {
return reviewsAllowed;
}
public void setReviewsAllowed(Boolean reviewsAllowed) {
this.reviewsAllowed = reviewsAllowed;
}
public String getAverageRating() {
return averageRating;
}
public void setAverageRating(String averageRating) {
this.averageRating = averageRating;
}
public Integer getRatingCount() {
return ratingCount;
}
public void setRatingCount(Integer ratingCount) {
this.ratingCount = ratingCount;
}
public List<Integer> getRelatedIds() {
return relatedIds;
}
public void setRelatedIds(List<Integer> relatedIds) {
this.relatedIds = relatedIds;
}
public List<Object> getUpsellIds() {
return upsellIds;
}
public void setUpsellIds(List<Object> upsellIds) {
this.upsellIds = upsellIds;
}
public List<Object> getCrossSellIds() {
return crossSellIds;
}
public void setCrossSellIds(List<Object> crossSellIds) {
this.crossSellIds = crossSellIds;
}
public Integer getParentId() {
return parentId;
}
public void setParentId(Integer parentId) {
this.parentId = parentId;
}
public String getPurchaseNote() {
return purchaseNote;
}
public void setPurchaseNote(String purchaseNote) {
this.purchaseNote = purchaseNote;
}
public List<Category> getCategories() {
return categories;
}
public void setCategories(List<Category> categories) {
this.categories = categories;
}
public List<Object> getTags() {
return tags;
}
public void setTags(List<Object> tags) {
this.tags = tags;
}
public List<Image> getImages() {
return images;
}
public void setImages(List<Image> images) {
this.images = images;
}
public List<Attribute> getAttributes() {
return attributes;
}
public void setAttributes(List<Attribute> attributes) {
this.attributes = attributes;
}
public List<Object> getDefaultAttributes() {
return defaultAttributes;
}
public void setDefaultAttributes(List<Object> defaultAttributes) {
this.defaultAttributes = defaultAttributes;
}
public List<Integer> getVariations() {
return variations;
}
public void setVariations(List<Integer> variations) {
this.variations = variations;
}
public List<Object> getGroupedProducts() {
return groupedProducts;
}
public void setGroupedProducts(List<Object> groupedProducts) {
this.groupedProducts = groupedProducts;
}
public Integer getMenuOrder() {
return menuOrder;
}
public void setMenuOrder(Integer menuOrder) {
this.menuOrder = menuOrder;
}
public List<MetaDatum> getMetaData() {
return metaData;
}
public void setMetaData(List<MetaDatum> metaData) {
this.metaData = metaData;
}
public Links getLinks() {
return links;
}
public void setLinks(Links links) {
this.links = links;
}
}
The code that I use is the following:
public void onResponse(Call call, Response response) throws IOException
{
String mMessage = response.body().string();
if (response.isSuccessful())
{
try
{
Gson gson = new Gson();
final ProductItems categoryProducts = gson.fromJson(mMessage, ProductItems.class);
response.close();
}
catch (Exception e)
{
Log.e("Error", "Failed to upload");
e.printStackTrace();
}
However, I get the following error: GSON throwing “Expected BEGIN_OBJECT but was BEGIN_ARRAY.
I have tried to change the ProductItems class to taking an object for productbycategories but then I get the following error: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected a string but was BEGIN_OBJECT at line 1 column 2324 path $.ProductsByCategory[0].meta_data[0].value. I am now a bit confused.

The reason you get this error is that the data is not consistent with the way the POJO is generated.
This is the specific part of the data that has the issue:
"meta_data": [
{
"id": 14232,
"key": "_vc_post_settings",
"value": {
"vc_grid_id": []
}
},
{
"id": 14273,
"key": "fb_product_description",
"value": ""
},
{
"id": 14274,
"key": "fb_visibility",
"value": "1"
},
Notice how the "meta_data" field is an array of objects and that these objects contain a "value" field. The data type of the "value" varies- sometimes it's an object and other times it's a string.
One possible solution would be to change the MetaDatum class so that the value is an Object:
package com.example;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class MetaDatum {
...
#SerializedName("value")
#Expose
private Object value;
...
public Object getValue() {
return value;
}
public void setValue(Object value) {
this.value = value;
}
}

How do I map Retrofit response to Data Model Class?

Here is my Retrofit Call...
public void getContests() {
String token = LoginActivity.authToken;
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(OctoInterface.BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
OctoInterface api = retrofit.create(OctoInterface.class);
Call<List<OctoModel2>> call = api.getOctoContests(token);
call.enqueue(new Callback<List<OctoModel2>>() {
#Override
public void onResponse(Call<List<OctoModel2>> call, Response<List<OctoModel2>> response) {
int statusCode = response.code();
int i = 0;
if (response.body().size() > titleList.size()) {
for (i = 0; i <= response.body().size() -1; i++) {
contestIdList.add(String.valueOf(response.body().get(i).getId()));
titleList.add(response.body().get(i).getTitle());
subtitleList.add(response.body().get(i).getDescShort());
offerIdList.add(String.valueOf(response.body().get(i).getId()));
offerLogoList.add(response.body().get(i).getLogoUrl());
businessId = String.valueOf(response.body().get(i).getBusinessId());
submit_button_text = response.body().get(i).getSubmitButtonText();
}
}
}
#Override
public void onFailure(Call<List<OctoModel2>> call, Throwable t) {
Log.e("Get Contest failure", call.toString());
t.printStackTrace();
}
});
}
As you can see, I'm currently grabbing the pieces of the response that I need and passing them to individual array lists. I'd much rather pass the entire return into a list of model objects that hold the data.
Here is my POJO class for retrofit...
public class OctoModel2 {
#SerializedName("how_it_works")
#Expose
private List<String> howItWorks = null;
#SerializedName("id")
#Expose
private int id;
#SerializedName("business_id")
#Expose
private int businessId;
#SerializedName("title")
#Expose
private String title;
#SerializedName("desc_short")
#Expose
private String descShort;
#SerializedName("logo_url")
#Expose
private String logoUrl;
#SerializedName("hashtag")
#Expose
private String hashtag;
#SerializedName("confirm_message_title")
#Expose
private String confirmMessageTitle;
#SerializedName("rules")
#Expose
private String rules;
#SerializedName("confirm_message")
#Expose
private String confirmMessage;
#SerializedName("start_date")
#Expose
private String startDate;
#SerializedName("end_date")
#Expose
private String endDate;
#SerializedName("active")
#Expose
private boolean active;
#SerializedName("entry_count")
#Expose
private int entryCount;
#SerializedName("age_required")
#Expose
private int ageRequired;
#SerializedName("submit_button_text")
#Expose
private String submitButtonText;
#SerializedName("hide_redeem_code")
#Expose
private boolean hideRedeemCode;
#SerializedName("redeem_button_text")
#Expose
private String redeemButtonText;
#SerializedName("rules_text")
#Expose
private String rulesText;
#SerializedName("mode")
#Expose
private String mode;
#SerializedName("entry_mode")
#Expose
private String entryMode;
#SerializedName("created_at")
#Expose
private String createdAt;
#SerializedName("updated_at")
#Expose
private String updatedAt;
#SerializedName("deleted_at")
#Expose
private Object deletedAt;
#SerializedName("locations")
#Expose
private List<Location> locations = null;
#SerializedName("entries")
#Expose
private List<Entry> entries = null;
#SerializedName("entry")
#Expose
private Entry entry;
#SerializedName("AWSAccessKeyId")
#Expose
private String aWSAccessKeyId;
#SerializedName("key")
#Expose
private String key;
#SerializedName("policy")
#Expose
private String policy;
#SerializedName("signature")
#Expose
private String signature;
#SerializedName("uuid")
#Expose
private String uuid;
#SerializedName("reward")
#Expose
private Reward reward;
#SerializedName("s3_url")
#Expose
private String s3_url;
public OctoModel2(Integer id, Integer businessId, String title, String descShort, String logoUrl, String hashtag, String confirmMessageTitle, String rules, String confirmMessage, String startDate, String endDate, Boolean active,
String submitButtonText, String redeemButtonText, String rulesText, List<Location> locations, String aWSAccessKeyId, String key, String policy, String signature, String uuid) {
this.id = id;
this.businessId = businessId;
this.title = title;
this.descShort = descShort;
this.logoUrl = logoUrl;
this.hashtag = hashtag;
this.confirmMessageTitle = confirmMessageTitle;
this.rules = rules;
this.confirmMessage = confirmMessage;
this.startDate = startDate;
this.endDate = endDate;
this.active = active;
this.submitButtonText = submitButtonText;
this.redeemButtonText = redeemButtonText;
this.rulesText = rulesText;
this.locations = locations;
this.aWSAccessKeyId = aWSAccessKeyId;
this.key = key;
this.policy = policy;
this.signature = signature;
this.uuid = uuid;
}
public List<String> getHowItWorks() {
return howItWorks;
}
public void setHowItWorks(List<String> howItWorks) {
this.howItWorks = howItWorks;
}
public int getId() {
return id;
}
public List<OctoModel2> getResults() {
return results;
}
public void setId(int id) {
this.id = id;
}
public int getBusinessId() {
return businessId;
}
public void setBusinessId(int businessId) {
this.businessId = businessId;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescShort() {
return descShort;
}
public void setDescShort(String descShort) {
this.descShort = descShort;
}
public String getLogoUrl() {
return logoUrl;
}
public void setLogoUrl(String logoUrl) {
this.logoUrl = logoUrl;
}
public String getHashtag() {
return hashtag;
}
public void setHashtag(String hashtag) {
this.hashtag = hashtag;
}
public String getConfirmMessageTitle() {
return confirmMessageTitle;
}
public void setConfirmMessageTitle(String confirmMessageTitle) {
this.confirmMessageTitle = confirmMessageTitle;
}
public String getRules() {
return rules;
}
public void setRules(String rules) {
this.rules = rules;
}
public String getConfirmMessage() {
return confirmMessage;
}
public void setConfirmMessage(String confirmMessage) {
this.confirmMessage = confirmMessage;
}
public String getStartDate() {
return startDate;
}
public void setStartDate(String startDate) {
this.startDate = startDate;
}
public String getEndDate() {
return endDate;
}
public void setEndDate(String endDate) {
this.endDate = endDate;
}
public boolean isActive() {
return active;
}
public void setActive(boolean active) {
this.active = active;
}
public int getEntryCount() {
return entryCount;
}
public void setEntryCount(int entryCount) {
this.entryCount = entryCount;
}
public int getAgeRequired() {
return ageRequired;
}
public void setAgeRequired(int ageRequired) {
this.ageRequired = ageRequired;
}
public String getSubmitButtonText() {
return submitButtonText;
}
public void setSubmitButtonText(String submitButtonText) {
this.submitButtonText = submitButtonText;
}
public boolean isHideRedeemCode() {
return hideRedeemCode;
}
public void setHideRedeemCode(boolean hideRedeemCode) {
this.hideRedeemCode = hideRedeemCode;
}
public String getRedeemButtonText() {
return redeemButtonText;
}
public void setRedeemButtonText(String redeemButtonText) {
this.redeemButtonText = redeemButtonText;
}
public String getRulesText() {
return rulesText;
}
public void setRulesText(String rulesText) {
this.rulesText = rulesText;
}
public String getMode() {
return mode;
}
public void setMode(String mode) {
this.mode = mode;
}
public String getEntryMode() {
return entryMode;
}
public void setEntryMode(String entryMode) {
this.entryMode = entryMode;
}
public String getCreatedAt() {
return createdAt;
}
public void setCreatedAt(String createdAt) {
this.createdAt = createdAt;
}
public String getUpdatedAt() {
return updatedAt;
}
public void setUpdatedAt(String updatedAt) {
this.updatedAt = updatedAt;
}
public Object getDeletedAt() {
return deletedAt;
}
public void setDeletedAt(Object deletedAt) {
this.deletedAt = deletedAt;
}
public List<Location> getLocations() {
return locations;
}
public void setLocations(List<Location> locations) {
this.locations = locations;
}
public List<Entry> getEntries() {
return entries;
}
public void setEntries(List<Entry> entries) {
this.entries = entries;
}
public Entry getEntry() {
return entry;
}
public String getAWSAccessKeyId() {
return aWSAccessKeyId;
}
public void setAWSAccessKeyId(String aWSAccessKeyId) {
this.aWSAccessKeyId = aWSAccessKeyId;
}
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
public String getPolicy() {
return policy;
}
public void setPolicy(String policy) {
this.policy = policy;
}
public String getSignature() {
return signature;
}
public String gets3url() {
return s3_url;
}
public void setSignature(String signature) {
this.signature = signature;
}
public Reward getReward() {
return reward;
}
public void setReward(Reward reward) {
this.reward = reward;
}
public String getUuid() {
return uuid;
}
public void setUuid(String uuid) {
this.uuid = uuid;
}
}
Instead of calling the data from each list like
TitleList.get(position);
SubtitleList.get(position);
LogoUrlList.get(position);
etc...
I'd like to be able to call
Contests.get(position).getTitle();
Contests.get(position).getSubtitle();
Contests.get(position).getLogoUrl();
or however it would be. This would make it better for me to sort the responses and get the data from individual responses without hoping and praying that I'm pulling the correct item from the correct ArrayList.

You need a mapper that maps your DTO (Data Transfer Object) into an entity or list of entities. For example:
public interface Mapper<From, To> {
To map(From value);
}
Now you can create a class, e.g. called `MyRetrofitResponseMapper, that implements the interface and maps the fields needed.
Moreover, you can create multiple mappers that map the same DTO into different entities depending on what DTO fields are required for those.
An example can be found here.

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

How to set Json string array to Java object using Java

I have following JSON string that I need to set to the Java objects of POJO class.
What method should I follow?
{"status":"FOUND","messages":null,"sharedLists": [{"listId":"391647d","listName":"/???","numberOfItems":0,"colla borative":false,"displaySettings":true}] }
I tried using Gson but it did not work for me.
Gson gson = new Gson();
SharedLists target = gson.fromJson(sb.toString(), SharedLists.class);
Following is my SharedLists pojo
public class SharedLists {
#SerializedName("listId")
private String listId;
#SerializedName("listName")
private String listName;
#SerializedName("numberOfItems")
private int numberOfItems;
#SerializedName("collaborative")
private boolean collaborative;
#SerializedName("displaySettings")
private boolean displaySettings;
public int getNumberOfItems() {
return numberOfItems;
}
public void setNumberOfItems(int numberOfItems) {
this.numberOfItems = numberOfItems;
}
public boolean isCollaborative() {
return collaborative;
}
public void setCollaborative(boolean collaborative) {
this.collaborative = collaborative;
}
public boolean isDisplaySettings() {
return displaySettings;
}
public void setDisplaySettings(boolean displaySettings) {
this.displaySettings = displaySettings;
}
public String getListId() {
return listId;
}
public void setListId(String listId) {
this.listId = listId;
}
}

Following is your JSON string.
{
"status": "FOUND",
"messages": null,
"sharedLists": [
{
"listId": "391647d",
"listName": "/???",
"numberOfItems": 0,
"colla borative": false,
"displaySettings": true
}
]
}
Clearly sharedLists is a JSON array within the outer JSON object.
So I have two classes as follows (created from http://www.jsonschema2pojo.org/ by providing your JSON as input)
ResponseObject - Represents the outer object
public class ResponseObject {
#SerializedName("status")
#Expose
private String status;
#SerializedName("messages")
#Expose
private Object messages;
#SerializedName("sharedLists")
#Expose
private List<SharedList> sharedLists = null;
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public Object getMessages() {
return messages;
}
public void setMessages(Object messages) {
this.messages = messages;
}
public List<SharedList> getSharedLists() {
return sharedLists;
}
public void setSharedLists(List<SharedList> sharedLists) {
this.sharedLists = sharedLists;
}
}
and the SharedList - Represents each object within the array
public class SharedList {
#SerializedName("listId")
#Expose
private String listId;
#SerializedName("listName")
#Expose
private String listName;
#SerializedName("numberOfItems")
#Expose
private Integer numberOfItems;
#SerializedName("colla borative")
#Expose
private Boolean collaBorative;
#SerializedName("displaySettings")
#Expose
private Boolean displaySettings;
public String getListId() {
return listId;
}
public void setListId(String listId) {
this.listId = listId;
}
public String getListName() {
return listName;
}
public void setListName(String listName) {
this.listName = listName;
}
public Integer getNumberOfItems() {
return numberOfItems;
}
public void setNumberOfItems(Integer numberOfItems) {
this.numberOfItems = numberOfItems;
}
public Boolean getCollaBorative() {
return collaBorative;
}
public void setCollaBorative(Boolean collaBorative) {
this.collaBorative = collaBorative;
}
public Boolean getDisplaySettings() {
return displaySettings;
}
public void setDisplaySettings(Boolean displaySettings) {
this.displaySettings = displaySettings;
}
}
Now you can parse the entire JSON string with GSON as follows
Gson gson = new Gson();
ResponseObject target = gson.fromJson(inputString, ResponseObject.class);
Hope this helps.