Smack 4.1 SASL authentication error

问题

I am using Smack 4.1 native library for android to develop a chat application. I'm able to set a connection between my application and my server but I'm getting SmackException regarding SASL authentication while logging in.

Points to be noted.

There is no SASL authentication required on my server side.
My application is not crashing but getting the following errors which i have shown below in my log cat snnippet.

I'm using eclipse Luna and JDK version 1.7 and I have included the following libraries in the libs folder.

jxmpp-core-0.4.1
jxmpp-util-cache-0.4.1
minidns-0.1.1
smack-android-4.1.0.jar
smack-android-extensions-4.1.0
smack-core-4.1.0
smack-extensions-4.1.0
smack-im-4.1.0
smack-tcp-4.1.0

This is my code which I'm using to establish a connection.

XMPPTCPConnectionConfiguration.Builder configBuilder = XMPPTCPConnectionConfiguration.builder();
        configBuilder.setUsernameAndPassword(userName, pass);
        configBuilder.setSecurityMode(XMPPTCPConnectionConfiguration.SecurityMode.disabled);
        configBuilder.setResource("testServices");
        configBuilder.setServiceName(DOMAIN);
        configBuilder.setPort(PORT);
        configBuilder.setHost(DOMAIN);
        configBuilder.setDebuggerEnabled(true);

        AbstractXMPPConnection connection = new XMPPTCPConnection(
                configBuilder.build());

        /** Connecting to the server */
        try {
            connection.connect();
            Log.i(TAG, "Connected to " + connection.getHost());
        } catch (SmackException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (XMPPException e) {
            Log.e(TAG, "Failed to connect to " + connection.getHost());
            Log.e(TAG, e.toString());
            e.printStackTrace();
        }

        /** LogingIn to the server */
        try {

            //SASLMechanism.PLAIN();
            //SASLAuthentication.("PLAIN", 0);

            connection.login(userName, pass);
            // connection.login();
        } catch (XMPPException e) {
            e.printStackTrace();
        } catch (SmackException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        /** LogingOut from the server */
        connection.disconnect();

This is my logcat output.

04-20 22:22:51.584: D/SMACK(8335): SENT (0): <stream:stream xmlns='jabber:client' to='my_server_url' xmlns:stream='http://etherx.jabber.org/streams' version='1.0' from='10001@my_server_url' xml:lang='en'>
04-20 22:22:52.519: D/SMACK(8335): RECV (0): <stream:stream xmlns:stream="http://etherx.jabber.org/streams" xmlns="jabber:client" version="1.0" id="0768491716592086" from="my_server_url">
04-20 22:22:53.744: D/SMACK(8335): RECV (0): <stream:features><mechanisms xmlns="urn:ietf:params:xml:ns:xmpp-sasl"><mechanism>PLAIN</mechanism></mechanisms></stream:features>
04-20 22:22:53.749: I/(8335): Connected to "smy_server_url"

04-21 12:24:55.815: I/(16566): SmackException to my_server_link.comorg.jivesoftware.smack.SmackException: SASL Authentication failed. No known authentication mechanisims.
04-20 22:22:53.754: W/System.err(8335): org.jivesoftware.smack.SmackException: SASL Authentication failed. No known authentication mechanisims.
04-20 22:22:53.759: W/System.err(8335):     at org.jivesoftware.smack.SASLAuthentication.authenticate(SASLAuthentication.java:254)
04-20 22:22:53.759: W/System.err(8335):     at org.jivesoftware.smack.tcp.XMPPTCPConnection.loginNonAnonymously(XMPPTCPConnection.java:365)
04-20 22:22:53.759: W/System.err(8335):     at org.jivesoftware.smack.AbstractXMPPConnection.login(AbstractXMPPConnection.java:452)
04-20 22:22:53.759: W/System.err(8335):     at org.jivesoftware.smack.AbstractXMPPConnection.login(AbstractXMPPConnection.java:427)
04-20 22:22:53.759: W/System.err(8335):     at com.epixoft.ui.LoginActivity$ConnectionTestTask.doInBackground(LoginActivity.java:120)
04-20 22:22:53.759: W/System.err(8335):     at com.epixoft.ui.LoginActivity$ConnectionTestTask.doInBackground(LoginActivity.java:1)
04-20 22:22:53.759: W/System.err(8335):     at android.os.AsyncTask$2.call(AsyncTask.java:288)
04-20 22:22:53.759: W/System.err(8335):     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
04-20 22:22:53.759: W/System.err(8335):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
04-20 22:22:53.764: W/System.err(8335):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
04-20 22:22:53.764: W/System.err(8335):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
04-20 22:22:53.764: W/System.err(8335):     at java.lang.Thread.run(Thread.java:841)
04-20 22:22:53.784: D/SMACK(8335): SENT (0): <presence id='PwoLk-3' type='unavailable'><c xmlns='http://jabber.org/protocol/caps' hash='sha-1' node='http://www.igniterealtime.org/projects/smack' ver='NfJ3flI83zSdUDzCEICtbypursw='/></presence>
04-20 22:22:53.789: D/SMACK(8335): SENT (0): </stream:stream>
04-20 22:22:53.864: E/ViewRootImpl(8335): sendUserActionEvent() mView == null

Thanks in advance for any help. cheers :)