public void deleteMessages(List<String> nodes) throws XMPPException {
OfflineMessageRequest request = new OfflineMessageRequest();
for (String node : nodes) {
OfflineMessageRequest.Item item = new OfflineMessageRequest.Item(node);
item.setAction("remove");
request.addItem(item);
}
// Filter packets looking for an answer from the server.
PacketFilter responseFilter = new PacketIDFilter(request.getPacketID());
PacketCollector response = connection.createPacketCollector(responseFilter);
// Send the deletion request to the server.