--- old/test/jdk/jdk/jfr/event/runtime/TestClasses.java	2020-03-26 16:01:59.000000000 -0700
+++ new/test/jdk/jdk/jfr/event/runtime/TestClasses.java	2020-03-26 16:01:58.000000000 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -25,6 +25,14 @@
 
 package jdk.jfr.event.runtime;
 
+import java.lang.invoke.MethodType;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodHandles.Lookup;
+import java.lang.reflect.Array;
+import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*;
+
+import jdk.internal.misc.Unsafe;
+
 public class TestClasses {
 
     protected TestClassPrivate testClassPrivate;
@@ -76,8 +84,20 @@
 
 class TestClass {
     static {
-        // force creation of anonymous class (for the lambda form)
+        // force creation of hidden class (for the lambda form)
         Runnable r = () -> System.out.println("Hello");
         r.run();
     }
+
+    public static void createNonFindableClasses(byte[] klassbuf) throws Throwable {
+        // Create a hidden class and an array of hidden classes.
+        Lookup lookup = MethodHandles.lookup();
+        Class<?> clh = lookup.defineHiddenClass(klassbuf, false, NESTMATE).lookupClass();
+        Class<?> arrayOfHidden = Array.newInstance(clh, 10).getClass(); // HAS ISSUES?
+
+        // Create an Unsafe anonymous class and an array of unsafe anonymous classes.
+        Unsafe unsafe = Unsafe.getUnsafe();
+        Class<?> clu = unsafe.defineAnonymousClass(TestClass.class, klassbuf, new Object[0]);
+        final Class<?> arrayOfUAC = Array.newInstance(clu, 15).getClass();
+    }
 }