--- a/hotspot/test/gc/class_unloading/TestG1ClassUnloadingHWM.java	Mon Aug 11 14:03:06 2014 +0200
+++ b/hotspot/test/gc/class_unloading/TestG1ClassUnloadingHWM.java	Mon Aug 18 14:12:48 2014 +0200
@@ -46,6 +46,7 @@
   private static OutputAnalyzer run(boolean enableUnloading) throws Exception {
     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
       "-Xbootclasspath/a:.",
+      "-XX:+UnlockDiagnosticVMOptions",
       "-XX:+WhiteBoxAPI",
       "-XX:MetaspaceSize=" + MetaspaceSize,
       "-Xmn" + YoungGenSize,