How to Check if the openfire server supports flexible offline message Retrieval

Here is my code

public void configureAccount() {

connectionConfiguration = new ConnectionConfiguration(“182.71.209.49”,

5222);

connectionConfiguration.setSASLAuthenticationEnabled(false);

connectionConfiguration.setSecurityMode(SecurityMode.disabled);

connectionConfiguration.setSendPresence(false);

//connectionConfiguration.setDebuggerEnabled(true);

//connectionConfiguration.setSecurityMode(securityMode);

xmppConnection = new XMPPConnection(connectionConfiguration);

}

public void connect() {

if (xmppConnection != null) {

try {

//xmppConnection.disconnect();

xmppConnection.connect();

registerNewUser();

// xmppConnection.login(“admin”, “icareadmin”);

} catch (XMPPException e) {

e.printStackTrace();

} catch (NoClassDefFoundError e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

private void login(){

if(xmppConnection.isConnected()){

if(xmppConnection!=null){

try {

xmppConnection.login(“abc”, “pwd”);

Log.d(TAG,“Logged in as abc”);

OfflinePacketFilter();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

Log.d(TAG,"XMPPException "+e);

}

}

}else{

Log.d(TAG,“Not connected to server”);

//startConnection();

}

}

public void handleOfflineMessages(XMPPConnection connection)throws Exception {

try {

ServiceDiscoveryManager sdm= ServiceDiscoveryManager.getInstanceFor(connection);

OfflineMessageManager offlineMessageManager = new OfflineMessageManager(connection);

if (!offlineMessageManager.supportsFlexibleRetrieval()){ -------------------------i AM getting null pointer exception

Log.d(TAG,"does not supportsFlexibleRetrieval ");

return;

}

Log.d(TAG,"does it supportsFlexibleRetrieval "+offlineMessageManager.supportsFlexibleRetrieval()); */

//Log.d(TAG,"Message count " + offlineMessageManager.getMessageCount());

Iterator i = offlineMessageManager.getMessages();

if (!offlineMessageManager.supportsFlexibleRetrieval()){

Log.d(TAG,"does not supportsFlexibleRetrieval ");

return;

}

while (i.hasNext()) {

Message msg = i.next();

String fullJid = msg.getFrom();

String bareJid = StringUtils.parseBareAddress(fullJid);

String messageBody = msg.getBody();

if (messageBody != null) {

Log.d(TAG,“Retrieved offline message from " +bareJid+” -----"+messageBody);

}

}

offlineMessageManager.deleteMessages();

} catch (XMPPException e) {

e.printStackTrace();

return;

}

}

How to check if my openfire support flexible offline message retrieval. Please Please Help am struggling .if not how to get offline messages alternatively