smack failed to login on gtalk

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I'm using smack 4.0.4 and trying to establish a connection with gtalk server but without any success. connection.getHost() and connection.getUser() returns null . Here is my code

     ConnectionConfiguration connConfig = new ConnectionConfiguration("talk.google.com", 5222, "gmail.com");
     XMPPTCPConnection connection = new XMPPTCPConnection(connConfig);

        try {
            connection.connect();
            System.out.println("Connected to " + connection.getHost());
        } catch (XMPPException ex) {
            //ex.printStackTrace();
            System.out.println("Failed to connect to " + connection.getHost());
            System.exit(1);
        } catch (SmackException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            connection.login("user@example.com", "password");
            System.out.println("Logged in as " + connection.getUser());

            Presence presence = new Presence(Presence.Type.available);
            connection.sendPacket(presence);

        } catch (XMPPException ex) {
            //ex.printStackTrace();
            System.out.println("Failed to log in as " + connection.getUser());
            System.exit(1);
        } catch (SaslException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SmackException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

and the output is

Connected to null
Failed to log in as null

asked 39 secs ago

Doua Beri

1,054

smack failed to login on gtalk