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<dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-databind</artifactId>
   <version>{jackson-version}</version>
</dependency>

Feel free to use your favorite JSON processing API.

package com.mkyong.rest.client;

import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.map.ObjectMapper;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

public class ProcessText {

   public static void main(String[] args) {

      try {

         URL url = new URL("http://localhost:8080/_saga/processText");
         HttpURLConnection conn = (HttpURLConnection) url.openConnection();
         conn.setDoOutput(true);
         conn.setRequestMethod("POST");
         conn.setRequestProperty("Content-Type", "application/json");

         String input = "{" +
                        "\"q\":\"A WING FAILURE, RESULTING IN SUBSTANTIAL DAMAGE TO THE LAK-12 AIRCRAFT\"," +
                        "\"tags\":[\"aircraft\",\"component\"]," +
                        "\"splitRegex\": \"[\r|\n]+\"," +
                        "\"type\": \"text\"," +
                        "\"pretty\": true" +
                     "}";

         OutputStream os = conn.getOutputStream();
         os.write(input.getBytes());
         os.flush();

         ObjectMapper mapper = new ObjectMapper();


         JsonNode actualObj = mapper.readTree(new InputStreamReader(
               (conn.getInputStream())));

         if(actualObj != null){
            if (actualObj.get("_success").getBooleanValue()) {

               System.out.println("=================================================");
               System.out.println("=                    GRAPH                      =");
               System.out.println("=================================================\n\n");
               System.out.println(actualObj.get("data").get("graph").getTextValue());
               JsonNode nodeArray = actualObj.get("data").get("line");
               final String nodeTemplate = "%s (%.2f)[pos: %s]";
               List<String> nodeList = new ArrayList();
               if(nodeArray.isArray()){
                  nodeArray.forEach(jsonNode -> {
                     nodeList.add(String.format(nodeTemplate,
                           jsonNode.get("matching").getTextValue(),
                           jsonNode.get("confidence").getDoubleValue(),
                           jsonNode.get("character").getTextValue()));
                  });
               }
                    System.out.println("=================================================");
                    System.out.println("=           HIGHEST CONDIFIDENCE ROUTE          =");
                    System.out.println("=================================================\n\n");
               System.out.println(nodeList.stream().collect(Collectors.joining(" -> ")));
            } else {
               System.out.println("Failure");
            }
         }
         conn.disconnect();
      } catch (MalformedURLException e) {
         e.printStackTrace();
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
}