--- a/src/hotspot/share/jfr/recorder/checkpoint/types/jfrTypeSet.cpp	Mon Oct 28 18:43:54 2019 +0100
+++ b/src/hotspot/share/jfr/recorder/checkpoint/types/jfrTypeSet.cpp	Mon Oct 28 21:17:47 2019 +0100
@@ -754,9 +754,15 @@
   }
 };
 
+template <typename T>
+class EmptyStub {
+ public:
+  bool operator()(T const& value) { return true; }
+};
+
 typedef SerializePredicate<MethodPtr> MethodPredicate;
 typedef JfrPredicatedTypeWriterImplHost<MethodPtr, MethodPredicate, write__method> MethodWriterImplTarget;
-typedef Wrapper<KlassPtr, Stub> KlassCallbackStub;
+typedef Wrapper<KlassPtr, EmptyStub> KlassCallbackStub;
 typedef JfrTypeWriterHost<MethodWriterImplTarget, TYPE_METHOD> MethodWriterImpl;
 typedef MethodIteratorHost<MethodWriterImpl, KlassCallbackStub, BitMapFilter, false> MethodWriter;
 

--- a/src/hotspot/share/jfr/recorder/checkpoint/types/jfrTypeSetUtils.hpp	Mon Oct 28 18:43:54 2019 +0100
+++ b/src/hotspot/share/jfr/recorder/checkpoint/types/jfrTypeSetUtils.hpp	Mon Oct 28 21:17:47 2019 +0100
@@ -99,12 +99,6 @@
 };
 
 template <typename T>
-class Stub {
- public:
-  bool operator()(T const& value) { return true; }
-};
-
-template <typename T>
 class SerializePredicate {
   bool _class_unload;
  public: