From 99698a52726962fd02f4a08354cf605d0ca31cf8 Mon Sep 17 00:00:00 2001
From: Norman Maurer <nmaurer@redhat.com>
Date: Wed, 24 Oct 2012 18:46:56 +0200
Subject: [PATCH] Fix NPE when System property os.name does not exist. See #669
 and #679

---
 src/main/java/org/jboss/netty/util/internal/DetectionUtil.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/org/jboss/netty/util/internal/DetectionUtil.java b/src/main/java/org/jboss/netty/util/internal/DetectionUtil.java
index 845156009c..42d0e4369e 100644
--- a/src/main/java/org/jboss/netty/util/internal/DetectionUtil.java
+++ b/src/main/java/org/jboss/netty/util/internal/DetectionUtil.java
@@ -38,7 +38,7 @@ public final class DetectionUtil {
     private static final boolean HAS_UNSAFE = hasUnsafe(AtomicInteger.class.getClassLoader());
     private static final boolean IS_WINDOWS;
     static {
-        String os = SystemPropertyUtil.get("os.name").toLowerCase();
+        String os = SystemPropertyUtil.get("os.name", "").toLowerCase();
         // windows
         IS_WINDOWS =  os.indexOf("win") >= 0;
     }