diff -r 0b27f3512f9e -r 37f87013dfd8 src/share/vm/memory/heapInspection.cpp
--- a/src/share/vm/memory/heapInspection.cpp	Wed Jun 04 13:51:09 2008 -0700
+++ b/src/share/vm/memory/heapInspection.cpp	Thu Jun 05 15:57:56 2008 -0700
@@ -238,11 +238,14 @@
   HeapWord* ref;
 
   CollectedHeap* heap = Universe::heap();
+  bool is_shared_heap = false;
   switch (heap->kind()) {
+    case CollectedHeap::G1CollectedHeap:
     case CollectedHeap::GenCollectedHeap: {
-      GenCollectedHeap* gch = (GenCollectedHeap*)heap;
-      gch->gc_prologue(false /* !full */); // get any necessary locks
-      ref = gch->perm_gen()->used_region().start();
+      is_shared_heap = true;
+      SharedHeap* sh = (SharedHeap*)heap;
+      sh->gc_prologue(false /* !full */); // get any necessary locks, etc.
+      ref = sh->perm_gen()->used_region().start();
       break;
     }
 #ifndef SERIALGC
@@ -284,9 +287,9 @@
   }
   st->flush();
 
-  if (Universe::heap()->kind() == CollectedHeap::GenCollectedHeap) {
-    GenCollectedHeap* gch = GenCollectedHeap::heap();
-    gch->gc_epilogue(false /* !full */); // release all acquired locks
+  if (is_shared_heap) {
+    SharedHeap* sh = (SharedHeap*)heap;
+    sh->gc_epilogue(false /* !full */); // release all acquired locks, etc.
   }
 }