Getting bad request 400 error using asmack in android - android

I am trying to register a new user using my XMPP client using asmack library in Android on ejabberd server. The problem is that I am getting following error & the user is not being created on the server:
bad-request(400)
at org.jivesoftware.smack.AccountManager.createAccount(AccountManager.java:243)
at in.ui.MainActivity$1$1$1.run(MainActivity.java:316)
at java.lang.Thread.run(Thread.java:841)
Following is the code:
_xmppUsername = XMPPConfig.getStringUserInfoValue (XMPPConfig.XMPP_CLIENT_ID);
_xmppPassword = XMPPConfig.getStringUserInfoValue (XMPPConfig.XMPP_CLIENT_PASSWORD);
_xmppHost = XMPPConfig.getStringUserInfoValue (XMPPConfig.XMPP_HOST);
try {
_xmppPortNo = Integer.parseInt (XMPPConfig.getStringUserInfoValue (XMPPConfig.XMPP_PORT));
} catch (Exception e) {
e.printStackTrace ();
Log.e (TAG, e.getMessage ());
}
_xmppServiceName = XMPPConfig.getStringUserInfoValue (XMPPConfig.XMPP_SERVICE_NAME);
ConnectionConfiguration conConfig = new ConnectionConfiguration (_xmppHost, _xmppPortNo, _xmppServiceName);
_xmppConnection = new XMPPConnection (conConfig);
if (!_xmppConnection.isAuthenticated ()) {
login ();
}
/*
* If connection has not been established or had been established &
* broken again then login
*/
#Override
public void onShow (final DialogInterface dialog) {
Button positiveButton = _dlgRegistration.getButton (DialogInterface.BUTTON_POSITIVE);
positiveButton.setOnClickListener (new View.OnClickListener () {
#Override
public void onClick (View v) {
// Creating registration thread
new Thread (new Runnable () {
#Override
public void run () {
String clientID = null;
String password = null;
clientID = "user" + XMPP_SERVICE_NAME;
try {
// Getting hash password from UUID
password = "password";
Log.i (TAG, clientID + password);
} catch (NoSuchAlgorithmException e1) {
e1.printStackTrace ();
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace ();
}
}
AccountManager manager = _xmppConnection.getAccountManager ();
try {
// Creating account on the server
manager.createAccount (clientID, password, attr);
}
} catch (XMPPException e) {
e.printStackTrace ();
}
}
}).start ();
}
});

The problem was this line clientID = "user" + XMPP_SERVICE_NAME; where I shouldn't have been appending Domain or Service Name after "user".

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