code: public <T extends Item> List<T> getItems() throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
          return getItems((List<ExtensionElement>) null, null);
      }
docs: Get the current items stored in the node.
  
  @param <T> type of the items.
  @return List of {@link Item} in the node
  @throws XMPPErrorException
  @throws NoResponseException if there was no response from the server.
  @throws NotConnectedException
  @throws InterruptedException