--- /dev/null	2019-02-07 20:54:51.336000000 +0300
+++ new/test/lib/jfr/Stressor.java	2019-02-08 18:34:17.486630397 +0300
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2016, 2018, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+package jdk.test.lib.jfr;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Class to help run multiple threads executing some task
+ *
+ *
+ * @since 1.9
+ */
+public class Stressor {
+    public static void execute(int numberOfThreads, Thread.UncaughtExceptionHandler eh, Runnable task) throws Exception {
+        List<Thread> threads = new ArrayList<>();
+        for (int n = 0; n < numberOfThreads; ++n) {
+            Thread t = new Thread(task);
+            t.setUncaughtExceptionHandler(eh);
+            threads.add(t);
+            t.start();
+        }
+        for (Thread t : threads) {
+            t.join();
+        }
+    }
+}