NetworkInterface.isUp() may throw SocketException on subinterfaces.

Minimized test:
------------------
import java.net.*;
import java.util.*;

public class NITest {
       
    public static void main(String args[]) {
        Set<NetworkInterface> allInterfaces = null;
        try {
            allInterfaces = getNetworkInterfaces();
        } catch (SocketException ex) {
            ex.printStackTrace();
        }

        int count = 0;
        boolean passed = true;
        for (NetworkInterface ni: allInterfaces) {
            System.out.println("ni" + count + ": " + ni);
            try {
                System.out.println(" isUp: " + ni.isUp());
            } catch (Exception e) {
                System.out.println(" exception: " + e);
                passed = false;
            }
            count++;
            System.out.println("-----------");
        }
        System.out.println(passed ? "Test passed" : "Test failed");
    }
    
    static void addNetworkInterfaces( Set<NetworkInterface> set, Enumeration<NetworkInterface> e ) {
        while(e.hasMoreElements()){
            NetworkInterface ni = e.nextElement();
            set.add( ni );
            addNetworkInterfaces( set, ni.getSubInterfaces() );
        }
    }

    /**
     * Finds all NetworkInterfaces with subinterfaces
     */
    static Set<NetworkInterface> getNetworkInterfaces() throws SocketException {
        Set<NetworkInterface> res = new HashSet<NetworkInterface>();
        addNetworkInterfaces( res, NetworkInterface.getNetworkInterfaces() );
        return res;
    }
    
}
------------------

#> java -version
java version "1.6.0_05-ea"
Java(TM) SE Runtime Environment (build 1.6.0_05-ea-b05)
Java HotSpot(TM) Tiered VM (build 1.6.0_05-ea-b05, mixed mode)

#> java NITest
ni0: name:lo0 (lo0) index: 1 addresses:
/0:0:0:0:0:0:0:1%1;
/127.0.0.1;

  isUp: true
-----------
ni1: name:eri0 (eri0) index: 2 addresses:
/fc00:1068:0:0:203:baff:fe44:8dd8%2;
/fe80:0:0:0:203:baff:fe44:8dd8%2;
/10.16.106.226;

  isUp: true
-----------
ni2: name:eri0:1 (eri0:1) index: 2 addresses:
/fc00:1068:0:0:203:baff:fe44:8dd8%2;

  exception: java.net.SocketException: No such device or address
-----------
Test failed

#> ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
        inet 127.0.0.1 netmask ff000000
eri0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
        inet 10.16.106.226 netmask fffffe00 broadcast 10.16.107.255
lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252 index 1
        inet6 ::1/128
eri0: flags=2000841<UP,RUNNING,MULTICAST,IPv6> mtu 1500 index 2
        inet6 fe80::203:baff:fe44:8dd8/10
eri0:1: flags=2080841<UP,RUNNING,MULTICAST,ADDRCONF,IPv6> mtu 1500 index 2
        inet6 fc00:1068::203:baff:fe44:8dd8/64

#> uname -a
SunOS moonblade 5.10 Generic sun4u sparc SUNW,Sun-Blade-1000

--------
Comment:
isUp() throws exception on "/fc00:1068:0:0:203:baff:fe44:8dd8%2", but this interface is up and running.


6 JCK 6b tests:

api/java_net/MulticastSocket/descriptions.html#setTTL[MulticastSocket1017]
api/java_net/MulticastSocket/descriptions.html#setTTL[MulticastSocket1018]
api/java_net/MulticastSocket/descriptions.html#setTTL[MulticastSocket1019]
api/java_net/MulticastSocket/descriptions.html#setTimeToLive[MulticastSocket1020]
api/java_net/MulticastSocket/descriptions.html#setTimeToLive[MulticastSocket1021]
api/java_net/MulticastSocket/descriptions.html#setTimeToLive[MulticastSocket1022]

fail with a similar cause:

java.net.SocketException: No such device or address
at java.net.NetworkInterface.isUp0(Native Method)
at java.net.NetworkInterface.isUp(NetworkInterface.java:322)
at javasoft.sqe.tests.api.java.net.MulticastSocket.MulticastSocketSenderTest.execute(MulticastSocketSenderTest.java:95)
at javasoft.sqe.tests.api.java.net.MulticastSocket.setTTLTests.MulticastSocket1017(setTTLTests.java:66)
The JCK tests mentioned in description fail on JDK 6.0.