--- a/jaxws/src/java.xml.bind/share/classes/com/sun/xml/internal/org/jvnet/mimepull/MIMEPart.java	Thu Apr 09 06:40:17 2015 -0700
+++ b/jaxws/src/java.xml.bind/share/classes/com/sun/xml/internal/org/jvnet/mimepull/MIMEPart.java	Fri Apr 10 14:54:20 2015 +0300
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 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
@@ -25,6 +25,7 @@
 
 package com.sun.xml.internal.org.jvnet.mimepull;
 
+import java.io.Closeable;
 import java.io.File;
 import java.io.InputStream;
 import java.nio.ByteBuffer;
@@ -42,10 +43,11 @@
  *
  * @author Jitendra Kotamraju, Martin Grebac
  */
-public class MIMEPart {
+public class MIMEPart implements Closeable {
 
     private static final Logger LOGGER = Logger.getLogger(MIMEPart.class.getName());
 
+    private volatile boolean closed;
     private volatile InternetHeaders headers;
     private volatile String contentId;
     private String contentType;
@@ -55,6 +57,8 @@
     final MIMEMessage msg;
     private final DataHead dataHead;
 
+    private final Object lock = new Object();
+
     MIMEPart(MIMEMessage msg) {
         this.msg = msg;
         this.dataHead = new DataHead(this);
@@ -91,8 +95,16 @@
      * the temp file that is used to serve this part's content). After
      * calling this, one shouldn't call {@link #read()} or {@link #readOnce()}
      */
+    @Override
     public void close() {
-        dataHead.close();
+        if (!closed) {
+            synchronized (lock) {
+                if (!closed) {
+                    dataHead.close();
+                    closed = true;
+                }
+            }
+        }
     }
 
     /**
@@ -242,6 +254,15 @@
         this.contentTransferEncoding = cte;
     }
 
+    /**
+     * Return {@code true} if this part has already been closed, {@code false} otherwise.
+     *
+     * @return {@code true} if this part has already been closed, {@code false} otherwise.
+     */
+    public boolean isClosed() {
+        return closed;
+    }
+
     @Override
     public String toString() {
         return "Part="+contentId+":"+contentTransferEncoding;