diff -r 88b85470e72c -r f50545b5e2f1 src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/mimepull/DataFile.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/mimepull/DataFile.java	Tue Mar 06 16:09:35 2012 -0800
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 1997, 2010, 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 com.sun.xml.internal.org.jvnet.mimepull;
+
+import java.io.*;
+
+/**
+ * Use {@link RandomAccessFile} for concurrent access of read
+ * and write partial part's content.
+ *
+ * @author Kohsuke Kawaguchi
+ * @author Jitendra Kotamraju
+ */
+final class DataFile {
+    private WeakDataFile weak;
+    private long writePointer;
+
+    DataFile(File file) {
+        writePointer=0;
+        weak = new WeakDataFile(this, file);
+    }
+
+    /**
+     *
+     */
+    void close() {
+        weak.close();
+    }
+
+    /**
+     * Read data from the given file pointer position.
+     *
+     * @param pointer read position
+     * @param buf that needs to be filled
+     * @param offset the start offset of the data.
+     * @param length of data that needs to be read
+     */
+    synchronized void read(long pointer, byte[] buf, int offset, int length ) {
+        weak.read(pointer, buf, offset, length);
+    }
+
+    void renameTo(File f) {
+        weak.renameTo(f);
+    }
+
+    /**
+     * Write data to the file
+     *
+     * @param data that needs to written to a file
+     * @param offset start offset in the data
+     * @param length no bytes to write
+     * @return file pointer before the write operation(or at which the
+     *         data is written)
+     */
+    synchronized long writeTo(byte[] data, int offset, int length) {
+        long temp = writePointer;
+        writePointer = weak.writeTo(writePointer, data, offset, length);
+        return temp;
+    }
+
+}