/**
  * Method declaration
  *
  * @param node
  * @return
  * @see
  */
 @Override
 public Collection<String> getSubscribers(WAPrimaryKey pk) {
   SilverTrace.info(
       "subscribe", "SubscribeBmEJB.getNodeSubscribersId", "root.MSG_GEN_ENTER_METHOD");
   Connection con = null;
   try {
     con = getConnection();
     return subscriptionDao.getSubscribers(con, pk);
   } catch (Exception e) {
     throw new SubscribeRuntimeException(
         "SubscribeBmEJB.getNodeSubscribersId()",
         SilverpeasRuntimeException.ERROR,
         "subscribe.CANNOT_GET_NODE_SUBSCRIBERS",
         e);
   } finally {
     DBUtil.close(con);
   }
 }