--- a/src/hotspot/share/oops/klass.hpp	Fri Mar 09 12:03:20 2018 -0500
+++ b/src/hotspot/share/oops/klass.hpp	Thu Feb 08 09:23:49 2018 +0100
@@ -546,6 +546,9 @@
 
   const char* class_loader_and_module_name() const;
 
+  // Returns "interface", "abstract class" or "class".
+  const char* external_kind() const;
+
   // type testing operations
 #ifdef ASSERT
  protected: