--- /dev/null	2017-11-09 09:38:01.297999907 +0100
+++ new/src/jdk.management.jfr/share/classes/jdk/management/jfr/Stringifier.java	2018-04-09 16:28:02.755984350 +0200
@@ -0,0 +1,60 @@
+/*
+ * 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.management.jfr;
+/**
+ * Helper class for generating toString()
+ *
+ */
+final class Stringifier {
+    private final StringBuilder sb = new StringBuilder();
+    private boolean first = true;
+
+    public void add(String name, Object value) {
+        if (first) {
+            first = false;
+        } else {
+            sb.append(" ");
+        }
+        boolean isString = value instanceof String;
+        sb.append(name).append("=");
+        if (value == null) {
+            sb.append("null");
+        } else {
+            if (isString) {
+                sb.append("\"");
+            }
+            sb.append(value);
+            if (isString) {
+                sb.append("\"");
+            }
+        }
+    }
+
+    @Override
+    public String toString() {
+        return sb.toString();
+    }
+}