Null values after reading data from rest API

Question

Have similar problem to this but i couldnt work this out Getting null values when reading in JSON file in eclipse using java I'm having problem while reading data from this https://runsignup.com/Rest/races?format=json&country=US

Gson gson = new GsonBuilder().setPrettyPrinting().create();
        final String racesUri = "https://runsignup.com/Rest/races?format=json&country=US";
        HttpResponse<String> response = HttpClient
                .newBuilder()
                .proxy(ProxySelector.getDefault())
                .build()
                .send(Request.requestGet(racesUri), HttpResponse.BodyHandlers.ofString());
        RaceList races = gson.fromJson(response.body(), RaceList.class);
        System.out.println(response.body());
        System.out.println(races);

I just want to get "race_id" and "name" Race class looks like this:

package stefanowicz.kacper.model;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class Race {
    private long race_id;
    private String name;
}

Responsy body is perfectly fine but when im trying to convert it to the RaceList object which look like this:

package stefanowicz.kacper.model;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.List;

@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class RaceList {
    private List<Race> races;
}

And every Race has "race_id" equaled 0 and "name" as null.

RaceList(races=[Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null), Race(race_id=0, name=null)])

You are missing an object level (class) between RaceList and Race. — Roger Gustavsson
– Roger Gustavsson, Commented Sep 19, 2019 at 14:18

Roger Gustavsson · Accepted Answer · 2019-09-19 14:33:51Z

0

I think your classes should look something like this:

public class RaceList {
    private List<Race> races;
}

public class Race {
    private RaceData race;
}

public class RaceData {
    private long race_id;
    private String name;
    /* ... */
}

The name of the first race should then be accessed as races.getRaces().get(0).getRace().getName() if races is the name of the variable holding the RaceList object.

edited Sep 19, 2019 at 14:33

answered Sep 19, 2019 at 14:28

Roger Gustavsson

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Comments

Kacper1098 · Accepted Answer · 2019-09-19 15:00:27Z

0

Thanks guys, your answers have lead me to, i hope so, best solution:

@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class RaceList {
    private List<Map<String, Race>> races;
}

answered Sep 19, 2019 at 15:00

Kacper1098

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