From 4436f60e2f92cdcd86b42a95a3eb5e0955cb7064 Mon Sep 17 00:00:00 2001
From: Norman Maurer <norman@apache.org>
Date: Tue, 10 Apr 2012 21:00:44 +0200
Subject: [PATCH] Workaround to have multicast tests work on osx, linux and
 windows

---
 .../transport/socket/AbstractDatagramMulticastTest.java  | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/testsuite/src/test/java/io/netty/testsuite/transport/socket/AbstractDatagramMulticastTest.java b/testsuite/src/test/java/io/netty/testsuite/transport/socket/AbstractDatagramMulticastTest.java
index 15c5095f6e..673688e10d 100644
--- a/testsuite/src/test/java/io/netty/testsuite/transport/socket/AbstractDatagramMulticastTest.java
+++ b/testsuite/src/test/java/io/netty/testsuite/transport/socket/AbstractDatagramMulticastTest.java
@@ -28,6 +28,7 @@ import io.netty.channel.socket.DatagramChannelFactory;
 import io.netty.testsuite.util.TestUtils;
 import io.netty.util.internal.ExecutorUtil;
 
+import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.NetworkInterface;
 import java.util.concurrent.CountDownLatch;
@@ -72,7 +73,13 @@ public abstract class AbstractDatagramMulticastTest {
 
         int port = TestUtils.getFreePort();
         
-        NetworkInterface iface = NetworkInterface.getNetworkInterfaces().nextElement();
+        NetworkInterface iface = NetworkInterface.getByInetAddress(InetAddress.getLocalHost());
+        
+        // check if the NetworkInterface is null, this is the case on my ubuntu dev machine but not on osx and windows.
+        // if so fail back the the first interface
+        if (iface == null) {
+            iface = NetworkInterface.getByIndex(0);
+        }
         sb.setOption("networkInterface", iface);
         sb.setOption("reuseAddress", true);