/**
   * Deletes a group if possible.
   *
   * @param proxy The user management webservice.
   */
  private static void deleteGroup(final UserManagementPortTypeProxy proxy) {
    final AuthenticationToken token = Settings.getAuthToken();
    try {
      final Group group = proxy.getGroup(GROUP_NAME, token);
      if (group == null) {
        LOG.info("Group [name=" + GROUP_NAME + "] not deleted because it does not exist");
      } else {
        proxy.deleteGroup(GROUP_NAME, token);
        LOG.info(
            "Group [name="
                + group.getName()
                + ", roles="
                + Arrays.toString(group.getRoles())
                + ']'
                + " deleted.");
      }

    } catch (final RemoteException e) {
      LOG.error(null, e);
    }
  }
  /**
   * Creates a group if it does not exists already.
   *
   * @param proxy The user management webservice.
   */
  private static void createGroups(final UserManagementPortTypeProxy proxy) {
    final AuthenticationToken token = Settings.getAuthToken();
    try {
      final Group group = proxy.getGroup(GROUP_NAME, token);
      if (group == null) {
        final Group newGroup = proxy.createGroup(GROUP_NAME, ROLES, token);
        LOG.info(
            "Group [name="
                + newGroup.getName()
                + ", roles="
                + Arrays.toString(newGroup.getRoles())
                + "] created.");
      } else {
        LOG.info(
            "Group [name="
                + group.getName()
                + ", roles="
                + Arrays.toString(group.getRoles())
                + "]"
                + " already exists.");
      }

    } catch (final RemoteException e) {
      LOG.error(null, e);
    }
  }