[jcifs] SmbFileOutputStream with append=true misbehaving on a certain NAS

Daniel Tripp dtripp at mdisolutions.com
Fri Jan 18 02:13:25 GMT 2008

Hello.  I have run into some strange behaviour when using a
SmbFileOutputStream with append=true.  This behaviour is produced by the
code below, but only when I try to write to a certain NAS I have in my
office here; the code runs fine when I write to other network shares around
the office.  So I am wondering if anyone has seen anything like this before,
or has any suggestions or other insight into this issue.


The strange behaviour is that the file produced by the code below is not 2
bytes, as would be expected.  After running the program, Windows Explorer
reports the file size as about 900 megs.  The contents of the file produced
is random garbage which looks suspiciously like the contents of some other
files that I know to be on this NAS.


There is more strangeness (involving an "SmbException: Incorrect function"
on the appending write) if I try to write more than two bytes, but I won't
get into that here.


If I set the append argument to false, then everything behaves normally.


I am running JCIFS 1.2.17.  Results on java 1.4 and 1.5 are the same.


Thanks in advance.



(substitute your own path / username / password values, naturally)


import java.io.*;

import jcifs.smb.*;


public class Foo {

  static public void main(String args_[]) throws Exception {

    String url = "smb://STORAGE-MDI/Dan/"+System.currentTimeMillis()+".txt";

    NtlmPasswordAuthentication creds

      = new NtlmPasswordAuthentication("ntdom", "STORAGE-MDI\\Guest",

    SmbFile file = new SmbFile(url, creds);


    OutputStream outStream1 = new SmbFileOutputStream(file);




    SmbFileOutputStream outStream2 = new SmbFileOutputStream(file, true);









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