code: protected Response getStubbedResponse(Object requestObject) {
          // compatibility
          String resp = getStubResponse(externalRequestToString(requestObject));
          if (resp != null) {
              Response oldStubbed = new Response();
              oldStubbed.setObject(resp);
              oldStubbed.setContent(externalResponseToString(resp));
              return oldStubbed;
          }
  
          List<SimulationResponse> responses = new ArrayList<>();
          for (Attribute attr : this.getAttributes()) {
              if (attr.getAttributeName().startsWith(WorkAttributeConstant.SIMULATION_RESPONSE)) {
                  SimulationResponse r = new SimulationResponse(attr.getAttributeValue());
                  responses.add(r);
              }
          }
          String unfilteredResponse = null;
          String returnCode = null;
          if (responses.size() == 0) {
              unfilteredResponse = null;
          }
          else if (responses.size() == 1) {
              unfilteredResponse = responses.get(0).getResponse();
              returnCode = responses.get(0).getReturnCode();
          }
          else {    // randomly pick a response based on chances
              int total_chances = 0;
              for (SimulationResponse r : responses) {
                  total_chances += r.getChance().intValue();
              }
              if (random == null)
                  random = new Random();
              int ran = random.nextInt(total_chances);
              int k = 0;
              for (SimulationResponse r : responses) {
                  if (ran >= k && ran < k + r.getChance().intValue()) {
                      unfilteredResponse = r.getResponse();
                      break;
                  }
                  k += r.getChance().intValue();
              }
          }
          Response response = new Response();
          String filtered = filter(unfilteredResponse, requestObject);
          response.setObject(filtered);
          response.setContent(filtered);
          if (returnCode != null) {
              try {
                  response.setStatusCode(Integer.parseInt(returnCode));
              }
              catch (NumberFormatException ex) {
              }
          }
          return response;
      }
docs: Return stubbed response from external system.