Java: load json with Gson

GsonService.java

package services;

import com.google.gson.Gson;

import java.io.InputStreamReader;
import java.io.Reader;
import java.util.Map;

public class GsonService {

    public GsonService(){
    }

    public void loadJson(){
        try {
            // create Gson instance
            Gson gson = new Gson();

            // create a reader
            Reader reader = new InputStreamReader(GsonService.class.getResourceAsStream("/data/cars.json"));

            // convert JSON file to map
            Map<?, ?> map = gson.fromJson(reader, Map.class);

            // print map entries
            for (Map.Entry<?, ?> entry : map.entrySet()) {
                System.out.println(entry.getKey() + "=" + entry.getValue());
            }

            // close reader
            reader.close();

        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

I would give credit to this article because I used most of that example only changed 1 line to use InputStreamReader instead of Files