diff -r 7f3b27d9c22d -r 4dab92cc7aed test/hotspot/jtreg/runtime/defineAnonClass/TestAnonSymbolLeak.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/defineAnonClass/TestAnonSymbolLeak.java	Wed Feb 13 07:22:09 2019 -0500
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2019, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+
+/*
+ * @test TestAnonSymbolLeak
+ * @bug 8218755
+ * @requires vm.opt.final.ClassUnloading
+ * @modules java.base/jdk.internal.misc
+ *          java.base/jdk.internal.org.objectweb.asm
+ *          java.management
+ * @library /test/lib /runtime/testlibrary
+ * @build p1.AnonSymbolLeak
+ * @build sun.hotspot.WhiteBox
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ *                              sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -Xlog:class+unload -XX:+WhiteBoxAPI TestAnonSymbolLeak
+ */
+
+import java.lang.reflect.Method;
+import sun.hotspot.WhiteBox;
+import jdk.test.lib.Asserts;
+
+public class TestAnonSymbolLeak {
+    static String className = "p1.AnonSymbolLeak";
+
+    private static class ClassUnloadTestMain {
+        public static void test() throws Exception {
+            // Load the AnonSymbolLeak class in a new class loader, run it, which loads
+            // an unsafe anonymous class in the same package p1.  Then unload it.
+            // Then test that the refcount of the symbol created for the prepended name doesn't leak.
+            ClassLoader cl = ClassUnloadCommon.newClassLoader();
+            Class<?> c = cl.loadClass(className);
+            c.getMethod("test").invoke(null);
+            cl = null; c = null;
+            ClassUnloadCommon.triggerUnloading();
+        }
+    }
+
+    public static WhiteBox wb = WhiteBox.getWhiteBox();
+
+    public static void main(String... args) throws Exception {
+        String oldName = "AnonClass";
+        String prependedName = "p1/AnonClass";
+        ClassUnloadCommon.failIf(wb.isClassAlive(className), "should not be loaded");
+        int countBeforeOld = wb.getSymbolRefcount(oldName);
+        int countBefore = wb.getSymbolRefcount(prependedName);
+        ClassUnloadTestMain.test();
+        ClassUnloadCommon.failIf(wb.isClassAlive(className), "should be unloaded");
+        int countAfterOld = wb.getSymbolRefcount(oldName);
+        int countAfter = wb.getSymbolRefcount(prependedName);
+        Asserts.assertEquals(countBeforeOld, countAfterOld); // no leaks to the old name
+        System.out.println("count before and after " + countBeforeOld + " " + countAfterOld);
+        Asserts.assertEquals(countBefore, countAfter);       // no leaks to the prepended name
+        System.out.println("count before and after " + countBefore + " " + countAfter);
+    }
+}