--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/cds/appcds/javaldr/GCDuringDumpTransformer.java	Mon Jul 29 10:34:20 2019 -0400
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2017, 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.
+ *
+ */
+
+import java.lang.instrument.ClassFileTransformer;
+import java.lang.instrument.Instrumentation;
+import java.lang.instrument.IllegalClassFormatException;
+import java.security.ProtectionDomain;
+
+public class GCDuringDumpTransformer implements ClassFileTransformer {
+    public byte[] transform(ClassLoader loader, String name, Class<?> classBeingRedefined,
+                            ProtectionDomain pd, byte[] buffer) throws IllegalClassFormatException {
+        try {
+            makeGarbage();
+        } catch (Throwable t) {
+            t.printStackTrace();
+            try {
+                Thread.sleep(200); // let GC to have a chance to run
+            } catch (Throwable t2) {}
+        }
+
+        return null;
+    }
+
+    private static Instrumentation savedInstrumentation;
+
+    public static void premain(String agentArguments, Instrumentation instrumentation) {
+        System.out.println("ClassFileTransformer.premain() is called");
+        instrumentation.addTransformer(new GCDuringDumpTransformer(), /*canRetransform=*/true);
+        savedInstrumentation = instrumentation;
+    }
+
+    public static Instrumentation getInstrumentation() {
+        return savedInstrumentation;
+    }
+
+    public static void agentmain(String args, Instrumentation inst) throws Exception {
+        premain(args, inst);
+    }
+
+    public static void makeGarbage() {
+        for (int x=0; x<10; x++) {
+            Object[] a = new Object[10000];
+        }
+    }
+}