diff -r 6b6ddf8c4329 -r 80e866b1d053 src/share/vm/interpreter/interpreterRuntime.cpp
--- a/src/share/vm/interpreter/interpreterRuntime.cpp	Fri Nov 16 09:59:08 2012 +0100
+++ b/src/share/vm/interpreter/interpreterRuntime.cpp	Fri Nov 16 09:19:12 2012 -0500
@@ -312,7 +312,7 @@
 
 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
   ResourceMark rm(thread);
-  const char* klass_name = Klass::cast(obj->klass())->external_name();
+  const char* klass_name = obj->klass()->external_name();
   // lookup exception klass
   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
   if (ProfileTraps) {
@@ -341,7 +341,7 @@
 
   ResourceMark rm(thread);
   char* message = SharedRuntime::generate_class_cast_message(
-    thread, Klass::cast(obj->klass())->external_name());
+    thread, obj->klass()->external_name());
 
   if (ProfileTraps) {
     note_trap(thread, Deoptimization::Reason_class_check, CHECK);