RFR 8194260, Point-to-point interface should be excluded from java/net/ipv6tests/*

[Chris Hegarty]

> On 17 Apr 2018, at 04:34, Felix Yang <felix.yang at oracle.com> wrote:
> ...
>     http://cr.openjdk.java.net/~xiaofeya/8194260/webrev.00/

Thanks for doing this Felix. Mainly looks good. Just a few comments.

The old test runs on systems without IPv4 or IPv6 configured. So
I think the Optional `get` should be replaced with `orElse`. Either that
or update usage to check for the presence of a value in the Optional.

The old test filters out the loopback address, in order to get “real” 
addresses. I think we should preserve this behaviour. Other filtering
is done in the old tests too, but I don’t think it is really needed.

---
diff --git a/test/jdk/java/net/ipv6tests/Tests.java b/test/jdk/java/net/ipv6tests/Tests.java
--- a/test/jdk/java/net/ipv6tests/Tests.java
+++ b/test/jdk/java/net/ipv6tests/Tests.java
@@ -178,26 +178,28 @@
     }
 
     public static Inet4Address getFirstLocalIPv4Address () {
-        return getNetworkConfig().ip4Addresses()
-                                 .findFirst()
-                                 .get();
+        return networkConfig.ip4Addresses()
+                             .filter(a -> !a.isLoopbackAddress())
+                             .findFirst()
+                             .orElse(null);
     }
 
     public static Inet6Address getFirstLocalIPv6Address () {
-        return getNetworkConfig().ip6Addresses()
-                                 .findFirst()
-                                 .get();
+        return networkConfig.ip6Addresses()
+                             .filter(a -> !a.isLoopbackAddress())
+                             .findFirst()
+                             .orElse(null);
     }
 
+    private static NetworkConfiguration networkConfig = getNetworkConfig();
+
     private static NetworkConfiguration getNetworkConfig() {
-        NetworkConfiguration cfg = null;
         try {
-            cfg = NetworkConfiguration.probe();
+            return  NetworkConfiguration.probe();
         } catch (IOException e) {
             System.out.println("Failed to probe NetworkConfiguration");
             throw new RuntimeException(e);
         }
-        return cfg;
     }
 
-Chris.