Java http request and json processing

Json.java

/**
 * dependencies {
 *    implementation group: 'com.squareup.okhttp', name: 'okhttp', version: '2.7.5'
 *    implementation group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.12.3'
 * }
 */
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;

import java.util.Iterator;
import java.util.Map;

public class Json {
    public static void main(String[] args) {
        try {
            OkHttpClient client = new OkHttpClient();
            Request request = new Request.Builder()
                    .url("http://reddit.com/r/worldnews.json")
                    .build();
            Response response = client.newCall(request).execute();
            String json = response.body().string();

            JsonFactory factory = new JsonFactory();
            ObjectMapper mapper = new ObjectMapper(factory);
            JsonNode root = mapper.readTree(json);
            Iterator<Map.Entry<String,JsonNode>> fieldsIterator = root.fields();
            System.out.println(root.path("data").path("children").toString());
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}