code: public <T extends J4pResponse> List<T> getResponses() {
          List<T> ret = new ArrayList<T>();
          for (Object entry : results) {
              if (entry instanceof J4pResponse) {
                  ret.add((T) entry);
              }
          }
          return ret;
      }
docs: Get the a list of responses for successful requests.
  
  @param <T> response type
  @return list of successful responses.