--- a/hotspot/src/share/vm/runtime/java.hpp	Mon Sep 21 10:45:41 2015 +0200
+++ b/hotspot/src/share/vm/runtime/java.hpp	Fri Sep 11 15:31:03 2015 -0400
@@ -137,6 +137,14 @@
     return JDK_Version(major, 0, 0, update_number);
   }
 
+  static JDK_Version undefined() {
+    return JDK_Version(0);
+  }
+
+  bool is_undefined() const {
+    return (_major == 0);
+  }
+
   uint8_t major_version() const          { return _major; }
   uint8_t minor_version() const          { return _minor; }
   uint8_t micro_version() const          { return _micro; }