On mac os x, output of uptime command is different.

Next fix helped test to pass:
$ hg diff test/java/lang/management/OperatingSystemMXBean/GetSystemLoadAverage.java
diff -r d4a63859633c test/java/lang/management/OperatingSystemMXBean/GetSystemLoadAverage.java
--- a/test/java/lang/management/OperatingSystemMXBean/GetSystemLoadAverage.java Wed Jun 15 11:49:10 2011 -0700
+++ b/test/java/lang/management/OperatingSystemMXBean/GetSystemLoadAverage.java Mon Jul 04 02:55:08 2011 -0700
@@ -79,7 +79,7 @@
         System.out.println("Test passed.");
     }
 
- private static String LOAD_AVERAGE_TEXT = "load average:";
+ private static String LOAD_AVERAGE_TEXT = "load averages:";
     private static void checkLoadAvg() throws Exception {
         // Obtain load average from OS command
         ProcessBuilder pb = new ProcessBuilder("/usr/bin/uptime");
@@ -95,7 +95,7 @@
         System.out.println("Load average returned from uptime = " + output);
         System.out.println("getSystemLoadAverage() returned " + loadavg);
 
- String[] lavg = output.split(",");
+ String[] lavg = output.trim().split(" ");
         double expected = Double.parseDouble(lavg[0]);
         double lowRange = expected * (1 - DELTA);
         double highRange = expected * (1 + DELTA);