--- old/src/share/vm/memory/generation.cpp	2014-10-17 15:34:53.000000000 +0200
+++ new/src/share/vm/memory/generation.cpp	2014-10-17 15:34:53.000000000 +0200
@@ -65,7 +65,7 @@
 GenerationSpec* Generation::spec() {
   GenCollectedHeap* gch = GenCollectedHeap::heap();
   assert(0 <= level() && level() < gch->_n_gens, "Bad gen level");
-  return gch->_gen_specs[level()];
+  return level() == 0 ? gch->gen_policy()->young_gen_spec() : gch->gen_policy()->old_gen_spec();
 }
 
 size_t Generation::max_capacity() const {