I am mapping a file(&quot;sample.txt&quot;) to memory using `FileChannel.map()` and then closing the channel using `fc.close()`. After this when I write to the file using FileOutputStream, I am getting the following error:

&gt;    java.io.FileNotFoundException:
&gt; sample.txt (The requested operation
&gt; cannot be per formed on a file with a
&gt; user-mapped section open)

    File f = new File(&quot;sample.txt&quot;);
    RandomAccessFile raf = new RandomAccessFile(f,&quot;rw&quot;);
    FileChannel fc = raf.getChannel();
    MappedByteBuffer mbf = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
    fc.close();
    raf.close();

    FileOutputStream fos = new FileOutputStream(f);
    fos.write(str.getBytes());
    fos.close();

I presume this may be due to file being still mapped to the memory even after I close the `FileChannel`. Am I right?. If so, how can I &quot;unmap&quot; the file from memory?(I can&#39;t find any methods for this in the API).
Thanks.

Edit:
Looks like it(adding an unmap method) was submitted as RFE to sun some time back:
http://bugs.sun.com/view_bug.do?bug_id=4724038

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How to unmap a file from memory mapped using FileChannel in java?