diff -r 274a1ea904c8 -r fd44df5e3bc3 src/share/vm/classfile/classLoader.hpp
--- a/src/share/vm/classfile/classLoader.hpp	Wed Oct 14 16:43:13 2020 +0800
+++ b/src/share/vm/classfile/classLoader.hpp	Wed Oct 14 17:44:48 2020 +0800
@@ -366,6 +366,11 @@
   // creates a class path zip entry (returns NULL if JAR file cannot be opened)
   static ClassPathZipEntry* create_class_path_zip_entry(const char *apath);
 
+  // obtain package name from a fully qualified class name
+  // *bad_class_name is set to true if there's a problem with parsing class_name, to
+  // distinguish from a class_name with no package name, as both cases have a NULL return value
+  static const char* package_from_name(const char* const class_name, bool* bad_class_name = NULL);
+
   // Debugging
   static void verify()              PRODUCT_RETURN;