--- a/hotspot/src/share/vm/services/threadService.cpp	Tue Apr 29 19:40:51 2008 -0700
+++ b/hotspot/src/share/vm/services/threadService.cpp	Tue Apr 29 19:45:22 2008 -0700
@@ -541,6 +541,7 @@
 
 Handle ThreadStackTrace::allocate_fill_stack_trace_element_array(TRAPS) {
   klassOop k = SystemDictionary::stackTraceElement_klass();
+  assert(k != NULL, "must be loaded in 1.4+");
   instanceKlassHandle ik(THREAD, k);
 
   // Allocate an array of java/lang/StackTraceElement object