diff -r 5a83b7215107 -r 41515291559a src/share/vm/classfile/systemDictionary.cpp
--- a/src/share/vm/classfile/systemDictionary.cpp	Wed Dec 12 18:35:26 2018 +0100
+++ b/src/share/vm/classfile/systemDictionary.cpp	Tue Aug 28 10:10:11 2018 -0400
@@ -139,6 +139,9 @@
 }
 
 #endif
+#if INCLUDE_JFR
+#include "jfr/jfr.hpp"
+#endif
 
 // ----------------------------------------------------------------------------
 // Parallel class loading check
@@ -1749,6 +1752,7 @@
   // First, mark for unload all ClassLoaderData referencing a dead class loader.
   bool unloading_occurred = ClassLoaderDataGraph::do_unloading(is_alive, clean_alive);
   if (unloading_occurred) {
+    JFR_ONLY(Jfr::on_unloading_classes();)
     dictionary()->do_unloading();
     constraints()->purge_loader_constraints();
     resolution_errors()->purge_resolution_errors();