code: public List<Subscription> getSubscriptions() throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
          return getSubscriptions(null, null);
      }
docs: Get the subscriptions currently associated with this node.
  
  @return List of {@link Subscription}
  @throws XMPPErrorException
  @throws NoResponseException
  @throws NotConnectedException
  @throws InterruptedException