import org.jivesoftware.smack.tcp.XMPPTCPConnection;
import org.jivesoftware.smack.tcp.XMPPTCPConnectionConfiguration;
import org.jxmpp.jid.DomainBareJid;
import org.jxmpp.jid.EntityBareJid;
import org.jxmpp.jid.Jid;
import org.jxmpp.jid.impl.JidCreate;
import org.jxmpp.jid.util.JidUtil;
import org.jxmpp.stringprep.XmppStringprepException;

public class chat_try {
public static void main(String args[]) 
{

//DomainBareJid serviceName = JidCreate.bareFrom("test3@192.168.0.103");
//Jid jid= JidCreate.from("test3@192.168.0.103");
//Jid myJid = Jid("","",""); 
//Jid jid= JidCreate.from("xxxxx@winiqo.com");
String var = "sonic@nobody.com";
EntityBareJid jid = JidCreate.entityBareFrom(var);

XMPPTCPConnectionConfiguration config = XMPPTCPConnectionConfiguration.builder()
        .setUsernameAndPassword("test3", "elkill")
        //.setXmppDomain(serviceName)
        .setHost("192.168.0.103")
        .setPort(5222)
        .setDebuggerEnabled(true) // to view what's happening in detail
        .build();

XMPPTCPConnection conn1 = new XMPPTCPConnection(config);
try {
    conn1.connect();
    if(conn1.isConnected()) {
        System.out.println("isConnected");
    }
    conn1.login();

    if(conn1.isAuthenticated()) {
         System.out.println("isAuthenticated");
    }
}
catch (Exception e) {
     System.out.println(e.toString());
}

}}

This is my code for a simple XMPP user connection configuration using "smack" library.It requires a "XMPPDomain" to work. There's a ".setXmppDomain()" method for setting the domain, it takes a "DomainBareJid" as an argument, my attempts to convert a string to DomainBareJid using all the above libraries are resolving to the same error, "Unhandled exception type XmppStringprepException", help!

Sorry if it's a bad doubt, I'am new to Java coding.:)