code: package systemstesting;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.charset.StandardCharsets;
  import java.util.ArrayList;
  import org.apache.commons.io.IOUtils;
  import org.json.JSONArray;
  import org.json.JSONObject;
  import static systemstesting.Evaluator_WDAqua.systemAnswersList;
  
  
  public class CURLTest {
  
      public static void main(String[] args) throws IOException {
          String command = 
                  "curl -X POST http://qanswer-core1.univ-st-etienne.fr/api/gerbil?"
                  + "query=Who%20discovered%20Pluto%20&kb=wikidata";
          ProcessBuilder processBuilder = new ProcessBuilder(command.split(" "));
          Process process = processBuilder.start();
          InputStream inputStream = process.getInputStream();
          String result = IOUtils.toString(inputStream, StandardCharsets.UTF_8); 
          System.out.println(result);
          JSONObject json;
          result = result.replace("\\n", " ").replace("\\{", "{").replace("\\}", "}").replace("\\", "")
                      .replace("\"{", "{").replace("\"}", "}").replace("}\"", "}");
          json = new JSONObject(result);
  
              JSONArray bindings = json.getJSONArray("questions").getJSONObject(0)
                      .getJSONObject("question").getJSONObject("answers")
                      .getJSONObject("results").getJSONArray("bindings");
              System.out.println(bindings.toString());
  
              
              systemAnswersList = new ArrayList<>();
              
              for (int i = 0; i < bindings.length(); i++) {
                  JSONObject binding = (JSONObject) bindings.getJSONObject(i);
                  JSONObject o1 = (JSONObject) binding.getJSONObject("o1");
                  String value = (String) o1.get("value");
                  systemAnswersList.add(value.replace('_', ' ')
                          .replace("http://dbpedia.org/resource/", "")
                          .replace("https://en.wikipedia.org/wiki/", ""));
  
              }
      }
  }
  