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Exception while Creating Node to be Subscribed to get Notifications using Smack API

I am getting exceptions while creating a node to which I will be subscribed to get the notification using smack API. I have written the code I am using:

LeafNode node = null;

try {

try {

LeafNode existingNode = (LeafNode) mgr.getNode(publisherNodeID);

//exists, so delete

mgr.deleteNode(publisherNodeID);

} catch (XMPPException ex1) {

 //Here getting Exception that:  item-not-found(404)

System.out.println("XMPP Exception: " + ex1.getMessage());

}

node = (LeafNode) mgr.createNode(publisherNodeID);

} catch (XMPPException ex2) {

//And at the same time here getting exception: conflict(409)

System.err.println("Exception while Creating Node: "+ ex2.getMessage());

exit(0);

}

It looks strange to me as firstly I get exception that this node does not exist and then I get exception that The node I am going to create is conflicted(Already Exists).

Note:I am using 3 Jar files -

  1. smack-3.0.1.jar
  2. smackx-3.2.1.jar
  3. smackx-pubsub.0.6.jar