OPERATING SYSTEM(S):
--------------------
Microsoft Windows XP Professional SP2

FULL JDK VERSION(S):
-------------------
java version "1.6.0_02"
Java(TM) SE Runtime Environment (build 1.6.0_02-b06)
Java HotSpot(TM) Client VM (build 1.6.0_02-b06, mixed mode)

DESCRIPTION:
------------

Steps to reproduce
------------------

Compile and run the testcase using the following command
  >> javac LIR412.java
  >> java LIR412


Testcase
--------

import java.io.*;
import java.net.*;
import java.util.*;
import static java.lang.System.out;

public class LIR412 {
    public static void main(String args[]) throws SocketException {
        Enumeration<NetworkInterface> nets = NetworkInterface.getNetworkInterfaces();
        for (NetworkInterface netint : Collections.list(nets)) {
            if (netint.getName().compareTo("lo")==0) { //considering only loopback addresses
                out.printf("Hardware address: %s\n", Arrays.toString(netint.getHardwareAddress()));
            }
        }
    }
}


- Expected Result:
Hardware address: null //should be displayed

- Additional Information
Desired output is seen in Linux platform.

Test Case (with enhanced output):
---------------------------------

import java.io.*;
import java.net.*;
import java.util.*;
import static java.lang.System.out;

public class LIR412 {
    public static void main(String args[]) throws SocketException {
        Enumeration<NetworkInterface> nets = NetworkInterface.getNetworkInterfaces();
        for (NetworkInterface netint : Collections.list(nets)) {
            displayInterfaceInformation(netint);
        }
    }

    static void displayInterfaceInformation(NetworkInterface netint) throws

    SocketException {
        out.printf("Parent Info:%s\n", netint.getParent());
        out.printf("Display name: %s\n", netint.getDisplayName());
        out.printf("Name: %s\n", netint.getName());

        Enumeration<InetAddress> inetAddresses = netint.getInetAddresses();

        for (InetAddress inetAddress : Collections.list(inetAddresses)) {
            out.printf("InetAddress: %s\n", inetAddress);
        }

        List<InterfaceAddress> ias = netint.getInterfaceAddresses();

        Iterator<InterfaceAddress> iias = ias.iterator();
        while (iias.hasNext()) {
            InterfaceAddress ia = iias.next();

            out.println(" Interface Address");
            out.println(" Address: " + ia.getAddress());
            out.println(" Broadcast: " + ia.getBroadcast());
            System.out.println(" Prefix length: "
                               + ia.getNetworkPrefixLength());
        }

        Enumeration<NetworkInterface> subIfs = netint.getSubInterfaces();

        for (NetworkInterface subIf : Collections.list(subIfs)) {
            out.printf("\tSub Interface Display name: %s\n", subIf
                       .getDisplayName());
            out.printf("\tSub Interface Name: %s\n", subIf.getName());
        }
        out.printf("Up? %s\n", netint.isUp());
        out.printf("Loopback? %s\n", netint.isLoopback());
        out.printf("PointToPoint? %s\n", netint.isPointToPoint());
        out.printf("Supports multicast? %s\n", netint.supportsMulticast());
        out.printf("Virtual? %s\n", netint.isVirtual());
        out.printf("Hardware address: %s\n", Arrays.toString(netint.getHardwareAddress()));
        out.printf("MTU: %s\n", netint.getMTU());
        out.printf("\n");

    }

}