--- old/hotspot/src/share/vm/runtime/jniHandles.cpp	2010-03-29 16:16:21.000000000 +0100
+++ new/hotspot/src/share/vm/runtime/jniHandles.cpp	2010-03-29 16:16:20.000000000 +0100
@@ -173,7 +173,12 @@
   // is not permitted.
   return (thr->has_last_Java_frame() &&
          (void*)obj < (void*)thr->stack_base() &&
-         (void*)obj >= (void*)thr->last_Java_sp());
+#ifdef ZERO
+         (void*)obj >= (void*)thr->zero_stack()->sp()
+#else
+         (void*)obj >= (void*)thr->last_Java_sp()
+#endif // ZERO
+          );
 }