private List<DatabusSubscription> createSubscriptions(List<String> sources)
      throws DatabusClientException {
    List<DatabusSubscription> subs = null;

    try {
      subs = DatabusSubscription.createFromUriList(sources);
    } catch (Exception ex) {
      throw new DatabusClientException(ex);
    }
    return subs;
  }