ChatStateManager and NullPointerException

Hi,

I'm running into a NullPointerException that I can't seem to remedy when attempting to incorporate chat state.  I've tracked the source of the exception, but I can't figure out why it's happening.  I've stripped out code that I don't think is relevant.  The offending code is here:

publicclass SimpleXMPP implements ChatStateListener {     Connection connection;     ChatStateManager csm;         privatevoid connect(){          try{               this.connection = new XMPPConnection("mydomain.tld");               this.connection.connect();               csm = ChatStateManager.getInstance(this.connection);          }catch (XMPPException ex) {               // handle exception          }      }      publicvoid processMessage(Chat chat, Message msg) {          // handle incoming message     }         publicvoid stateChanged(Chat chat, ChatState state) {          // handle state change     } } 

Logging in and initializing chat happen after connect(), but the problem is at ChatStateManager.getInstance(this.connection).  This, in turn, calls:

WeakReference<ChatStateManager> ref = managers.get(connection);

... which returns ref = null.

So, it goes onto:

            if (ref == null) {                manager = new ChatStateManager(connection);                manager.init();                managers.put(connection, new WeakReference<ChatStateManager>(manager));            }

... and the problem is specifically on manager.init(), which looks like this:

    privatevoid init() {        connection.getChatManager().addOutgoingMessageInterceptor(outgoingInterceptor,                filter);        connection.getChatManager().addChatListener(incomingInterceptor);          ServiceDiscoveryManager.getInstanceFor(connection).addFeature("http://jabber.org/protocol/chatstates");    } 

The problem is that ServiceDiscoveryManager.getInstanceFor(connection) returns null.  So, we get a NullPointerException on that last line, of course.  So you don't have to look it up, getInstanceFor() looks like this:

    publicstatic ServiceDiscoveryManager getInstanceFor(Connection connection) {        return instances.get(connection);    } 

instances is empty at this point.

I'm betting that I am simply missing some important step before calling ChatStateManager.getInstance().  Any help would be greatly appreciated.  Incidentally, when I remove that line (csm=ChatStateManager.getInstance...) everything works perfectly, except that, obviously, I don't get chat state functionality.

I'm using Smack 3.3.1.

Thank you for looking.

Cheers,

Breandan