--- old/src/share/jaxws_classes/com/sun/xml/internal/messaging/saaj/packaging/mime/internet/ParameterList.java	2013-04-04 15:27:45.192613359 +0200
+++ new/src/share/jaxws_classes/com/sun/xml/internal/messaging/saaj/packaging/mime/internet/ParameterList.java	2013-04-04 15:27:45.140613358 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2010, 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
@@ -226,6 +226,8 @@
 
     // Quote a parameter value token if required.
     private String quote(String value) {
+        if ("".equals(value))
+                return "\"\"";
         return MimeUtility.quote(value, HeaderTokenizer.MIME);
     }