Expected BEGIN_OBJECT but was NUMBER - json

Question

im receiving this json as response from an rest server:
{
"externalOrderId":"5cb9bc46-aaa3-43ff-bb1a-6b17443f63ea",
"shortId":null,
"createdAt":1442255497402,
"updatedAt":1442255497402,
"cart":{
"id":"gy4ectxb3db84epljzhisqrf"
}
}
Then, when i try to parse this json using gson.fromJson, i got the error:
java.lang.IllegalStateException: Expected BEGIN_OBJECT but was NUMBER at line 1 column 201 path $.createdAt
here is the how im doing it:
public Order getOrder(String externalOrderId) throws Exception {
HttpRequest request = new HttpRequestBuilder()
.setUrl(new URI(baseURL + "/order/" + externalOrderId))
.build();
return gson.fromJson(HttpResource.getInstance().get(request).getBody(), new TypeToken<Order>(){}.getType());
}
The Order object:
private String externalOrderId;
private Long shortId;
private Date createdAt;
private Date updatedAt;
Thanks in advance.

Answer 1

Your createdAt and updatedAt fields are Date objects, whereas the JSON data has numbers. To be able to match against the numbers, you'll need to have createdAt and updatedAt also be Longs and the convert them to Date objects later.

Answer 2

Try This (See toString and longToDate metods in Order.java) -
Cart.java
public class Cart {
private String id;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
#Override
public String toString() {
return "Cart [id=" + id + "]";
}
}
Order.java
import java.util.Date;
public class Order {
private String externalOrderId;
private Long shortId;
private Long createdAt;
private Long updatedAt;
private Cart cart;
public String getExternalOrderId() {
return externalOrderId;
}
public void setExternalOrderId(String externalOrderId) {
this.externalOrderId = externalOrderId;
}
public Long getShortId() {
return shortId;
}
public void setShortId(Long shortId) {
this.shortId = shortId;
}
public Long getCreatedAt() {
return createdAt;
}
public void setCreatedAt(Long createdAt) {
this.createdAt = createdAt;
}
public Long getUpdatedAt() {
return updatedAt;
}
public void setUpdatedAt(Long updatedAt) {
this.updatedAt = updatedAt;
}
public Cart getCart() {
return cart;
}
public void setCart(Cart cart) {
this.cart = cart;
}
private Date longToDate(Long dt) {
return new Date(dt);
}
#Override
public String toString() {
return "Order [externalOrderId=" + externalOrderId + ", shortId="
+ shortId + ", createdAt=" + longToDate(createdAt) + ", updatedAt="
+ longToDate(updatedAt) + ", cart=" + cart + "]";
}
}
Main.java
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.testgson.beans.Order;
public class Main {
private static Gson gson;
static {
gson = new GsonBuilder().create();
}
public static void main(String[] args) {
String j = "{\"externalOrderId\":\"5cb9bc46-aaa3-43ff-bb1a-6b17443f63ea\",\"shortId\":null,\"createdAt\":1442255497402,\"updatedAt\":1442255497402,\"cart\":{\"id\":\"gy4ectxb3db84epljzhisqrf\"}}";
Order r = gson.fromJson(j, Order.class);
System.out.println(r);
}
}
Result
Order [externalOrderId=5cb9bc46-aaa3-43ff-bb1a-6b17443f63ea, shortId=null, createdAt=Tue Sep 15 00:01:37 IST 2015, updatedAt=Tue Sep 15 00:01:37 IST 2015, cart=Cart [id=gy4ectxb3db84epljzhisqrf]]