GSON fromJSON having problems - arrays

Question

I have a POJO class as below.
import java.util.List;
public class LocationInfoDTO{
private int _id;
private String name;
private String type;
private String fullName;
private int location_id;
private boolean isEurope;
private String countryCode;
private boolean coreCountry;
private int iataAirportCode;
private List<Geospatial> geo_location;
public int get_id() {
return _id;
}
public void set_id(int _id) {
this._id = _id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getFullName() {
return fullName;
}
public void setFullName(String fullName) {
this.fullName = fullName;
}
public int getLocation_id() {
return location_id;
}
public void setLocation_id(int location_id) {
this.location_id = location_id;
}
public boolean isEurope() {
return isEurope;
}
public void setEurope(boolean isEurope) {
this.isEurope = isEurope;
}
public String getCountryCode() {
return countryCode;
}
public void setCountryCode(String countryCode) {
this.countryCode = countryCode;
}
public boolean isCoreCountry() {
return coreCountry;
}
public void setCoreCountry(boolean coreCountry) {
this.coreCountry = coreCountry;
}
public int getIataAirportCode() {
return iataAirportCode;
}
public void getIataAirportCode(int iataAirportCode) {
this.iataAirportCode = iataAirportCode;
}
#Override
public String toString() {
return "LocationInfoDTO [_id=" + _id + ", name=" + name + ", type="
+ type + ", fullName=" + fullName + ", location_id="
+ location_id + ", isEurope=" + isEurope + ", countryCode="
+ countryCode + ", coreCountry=" + coreCountry
+ ", iataAirportCode=" + iataAirportCode + ", geo_location="
+ geo_location + "]";
}
public List<Geospatial> getGeo_location() {
return geo_location;
}
public void setGeo_location(List<Geospatial> geo_location) {
this.geo_location = geo_location;
}
}
All there will be inside a JSON object, just one thing the geospatial attribute has latitude and longitude and that is a different POJO class.All happens good using GSON fromJSON except the geo-location thing is null;
{"_id":376217,"key":null,"name":"test","fullName":"test, test","geo_position":{"latitude":52.52437,"longitude":13.41053}}
This is a sample JSON.
Triggering in this way
GsonBuilder gsonBuilder = new GsonBuilder();
Gson gson = gsonBuilder.create();
JSONArray array = new JSONArray(json);
for(int i=0;i<array.length();i++){
System.out.println("Array:"+gson.fromJson(array.getJSONObject(i).toString(), LocationInfoDTO.class));
EDIT--------------------------------
Changed the geo-location to geo-position
Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT

Answer 1

The error says exaclty what's wrong. You have a json object there for geo-location and it expects a list. Even if it's a one element list. Change
{"_id":376217,"key":null,"name":"test","fullName":"test, test","geo_position":{"latitude":52.52437,"longitude":13.41053}}
to
{"_id":376217,"key":null,"name":"test","fullName":"test, test","geo_position":[{"latitude":52.52437,"longitude":13.41053}]}
UPDATE
Since there will always be one lat/long, you should update your POJO so that geo_location is a single GeoSpatial object, not a List<GeoSpatial>