--- a/hotspot/src/share/vm/services/threadService.cpp	Mon Nov 03 11:34:13 2014 -0800
+++ b/hotspot/src/share/vm/services/threadService.cpp	Wed Oct 29 10:13:24 2014 +0100
@@ -597,7 +597,7 @@
     GrowableArray<oop>* locked_monitors = frame->locked_monitors();
     for (int j = 0; j < len; j++) {
       oop monitor = locked_monitors->at(j);
-      assert(monitor != NULL && monitor->is_instance(), "must be a Java object");
+      assert(monitor != NULL, "must be a Java object");
       if (monitor == object) {
         found = true;
         break;