[SNMP4J] problem regarding example code

[bhushan]

hello friends,
I am newbie to snmp4j. I have started using snmp4j, at initial stages
i am just trying example code, so i am facing problem in running those
i have written sample code which will listen for snmp3 request & on
receiving
request it just dump request on console, code is as follows

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import java.io.IOException;
import java.net.InetAddress;
import org.snmp4j.CommandResponder;
import org.snmp4j.CommandResponderEvent;
import org.snmp4j.PDU;
import org.snmp4j.Snmp;
import org.snmp4j.TransportMapping;
import org.snmp4j.mp.MPv3;
import org.snmp4j.mp.MessageProcessingModel;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.security.SecurityModels;
import org.snmp4j.security.SecurityProtocols;
import org.snmp4j.security.USM;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.UdpAddress;
import org.snmp4j.transport.DefaultUdpTransportMapping;
import org.snmp4j.transport.TransportMappings;

import sun.net.InetAddressCachePolicy;
import java.net.InetAddress;
import com.sun.jndi.cosnaming.IiopUrl.Address;


public class main_listen{

    public static void main(String arg[]) throws IOException  {
        // TODO Auto-generated method stub
        java.net.InetAddress address = null;
        String data = "0.0.0.0";
        InetAddress.getByName(data);
        int port=161;
        TransportMapping transport =
            new DefaultUdpTransportMapping(new UdpAddress(address, port));
        Snmp snmp = new Snmp(transport);
        int version = 0;
        if (version == SnmpConstants.version3) {
            byte[] localEngineID =
                MPv3.createLocalEngineID();
            USM usm = new USM(SecurityProtocols.getInstance(),
                              new OctetString(localEngineID), 0);
            SecurityModels.getInstance().addSecurityModel(usm);
            snmp.setLocalEngine(localEngineID, 0, 0);

            CommandResponder trapPrinter = new CommandResponder() {
                public synchronized void processPdu(CommandResponderEvent e)
{
                  PDU command = e.getPDU();
                  if (command != null) {
                    System.out.println(command.toString());
                  }
                }
              };
            snmp.addCommandResponder(trapPrinter);
            transport.listen();
            // Add the configured user to the USM

    };

}
}

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But  problem with my code is when i run this code it just run for second.
& exits, also it not showing any error/ exception on console.  i am unable
 to understand what is happening.as far as i understood from this code,
 is this code should wait for request & on receiving request it should dump
data
on console. but what is happening
i am unable to understand,
so Is my interpretation  correct or not ?
Is any thing wrong done by me in code ?
Please help me.
Thanks in advance
Regards
Bhushan E. Sonawane