--- /dev/null	2019-02-07 20:54:51.336000000 +0300
+++ new/test/lib/jdk/test/lib/util/SerializationUtils.java	2019-02-08 18:34:15.374703716 +0300
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2015, 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.
+ */
+
+package jdk.test.lib.util;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+
+/**
+ * Common library for various test serialization utility functions.
+ */
+public final class SerializationUtils {
+    /**
+     * Serialize an object into byte array.
+     */
+    public static byte[] serialize(Object obj) throws IOException {
+        ByteArrayOutputStream bs = new ByteArrayOutputStream();
+        try (ObjectOutputStream out = new ObjectOutputStream(bs)) {
+            out.writeObject(obj);
+        }
+        return bs.toByteArray();
+    }
+
+    /**
+     * Deserialize an object from byte array.
+     */
+    public static Object deserialize(byte[] ba) throws IOException, ClassNotFoundException {
+        try (ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(ba))) {
+            return in.readObject();
+        }
+    }
+    private SerializationUtils() {}
+}