--- old/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	2015-04-02 12:31:44.708324740 +0200
+++ new/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	2015-04-02 12:31:44.620324744 +0200
@@ -1004,7 +1004,7 @@
   void post_initialize();
 
   // Initialize weak reference processing.
-  virtual void ref_processing_init();
+  void ref_processing_init();
 
   // Explicitly import set_par_threads into this scope
   using SharedHeap::set_par_threads;