diff -r 4ebc2e2fb97c -r 71c04702a3d5 test/jdk/java/beans/XMLEncoder/Test4994637.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/beans/XMLEncoder/Test4994637.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2008, 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
+ * @bug 4994637
+ * @summary Tests custom map encoding
+ * @author Sergey Malenkov
+ */
+
+import java.util.HashMap;
+
+public final class Test4994637 extends AbstractTest<HashMap> {
+    public static void main(String[] args) {
+        new Test4994637().test(true);
+    }
+
+    @Override
+    protected CustomMap getObject() {
+        return new CustomMap();
+    }
+
+    @Override
+    protected CustomMap getAnotherObject() {
+        CustomMap map = new CustomMap();
+        map.clear();
+        map.put(null, "zero");
+        return map;
+    }
+
+    public static final class CustomMap extends HashMap<String, String> {
+        public CustomMap() {
+            put("1", "one");
+            put("2", "two");
+            put("3", "three");
+        }
+    }
+}