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I am trying to test a java program for IPv6 support on my local system having Windows 7 OS. I have assigned an IPv6 address and have disabled IPv4 in Network Connection.

When I execute ipconfig command I get IPv6 address as output.

However, when I execute below java code I get 127.0.0.1 which is an IPv4 address

System.setProperty("java.net.preferIPv6Stack","true");
InetAddress addr = InetAddress.getLocalHost();
System.out.println(addr.getHostAddress());
As per my understanding the above code should print 0:0:0:0:0:0:0:1.
Have I missed something?
                Problem is resolved. I was setting wrong System property.  Correct property is System.setProperty("java.net.preferIPv6Addresses","true")
– Vinod
                Sep 9, 2013 at 11:27
                @vinod please write that as an answer (possible immediately) and mark it as accepted (possible after two days)
– John Dvorak
                Sep 9, 2013 at 11:34
Problem is resolved. I was setting wrong System property. Correct system property that needs to be set is 
System.setProperty("java.net.preferIPv6Addresses","true")
After setting this property the IPv6 address assigned in Network Connection will be displayed.
IPv6 loopback address can be retrieved using below code.
InetAddress.getLoopbackAddress().getHostAddress()
        
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