--- a/src/hotspot/share/classfile/javaClasses.hpp	Mon May 07 14:42:10 2018 +0200
+++ b/src/hotspot/share/classfile/javaClasses.hpp	Mon May 07 11:38:21 2018 +0200
@@ -1321,6 +1321,12 @@
   // Debugging
   friend class JavaClasses;
   friend class ClassFileParser; // access to number_of_fake_fields
+
+  // Describe ClassLoader for exceptions, tracing ...
+  // Prints "<name>" (instance of <classname>, child of "<name>" <classname>).
+  // If a classloader has no name, it prints <unnamed> instead. The output
+  // for well known loaders (system/platform) is abbreviated.
+  static const char* describe_external(const oop loader);
 };