--- a/hotspot/src/share/vm/prims/jvmtiExport.cpp	Mon Mar 02 13:57:17 2009 -0700
+++ b/hotspot/src/share/vm/prims/jvmtiExport.cpp	Mon Mar 02 14:00:23 2009 -0700
@@ -1872,6 +1872,9 @@
 {
   // register the stub with the current dynamic code event collector
   JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current());
+  // state can only be NULL if the current thread is exiting which
+  // should not happen since we're trying to post an event
+  guarantee(state != NULL, "attempt to register stub via an exiting thread");
   JvmtiDynamicCodeEventCollector* collector = state->get_dynamic_code_event_collector();
   guarantee(collector != NULL, "attempt to register stub without event collector");
   collector->register_stub(name, code_begin, code_end);
@@ -2253,6 +2256,9 @@
 void JvmtiEventCollector::setup_jvmti_thread_state() {
   // set this event collector to be the current one.
   JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current());
+  // state can only be NULL if the current thread is exiting which
+  // should not happen since we're trying to configure for event collection
+  guarantee(state != NULL, "exiting thread called setup_jvmti_thread_state");
   if (is_vm_object_alloc_event()) {
     _prev = state->get_vm_object_alloc_event_collector();
     state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)this);