--- old/src/java.xml.ws/share/classes/com/sun/xml/internal/messaging/saaj/packaging/mime/internet/UniqueValue.java	2015-10-16 12:58:15.000000000 +0200
+++ new/src/java.xml.ws/share/classes/com/sun/xml/internal/messaging/saaj/packaging/mime/internet/UniqueValue.java	2015-10-16 12:58:15.000000000 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2012, 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
@@ -60,7 +60,7 @@
      * and the current time (in milliseconds).
      */
     public static String getUniqueBoundaryValue() {
-        StringBuffer s = new StringBuffer();
+        StringBuilder s = new StringBuilder();
 
         // Unique string is ----=_Part_<part>_<hashcode>.<currentTime>
         s.append("----=_Part_").append(part++).append("_").