Details
Major Description
For my application I need a way to get the InputStream of a binary file on a
FTPServer. What I did was :
// connect and get ftpFiles as an array
// for each ftpFile ...
InputStream is = ftp.retrieveFileStream(ftpFiles[i].getName());
However, this behaves erratically : sometimes the inputstream is correct and
sometimes it is null (and the ftpFile exists, no weird name or anything odd
about it).
After first blaming my FTPServer (I use GuildFTPd 0.9.9.13) I tried another
FTPServer (Serv-U 6.1), but this also had the same behavior.
Then I thought I might have to do with timing. So I tried Thread.sleep(xxx) on a
couple of locations but to no avail. In a last attempt (was getting pretty
desperate 
) I rewrote my original line and replaced it by this :
ByteArrayOutputStream out = new ByteArrayOutputStream();
ftp.retrieveFile(ftpFiles[i].getName(),out);
InputStream is = new ByteArrayInputStream(out.toByteArray());
And much to my surprise, it worked like a charm. Tested it a couple of times (on
both FTPServer products) and works perfectly.
So I'm guessing something is going wrong in your retrieveFileStream
implementation. Maybe something worth looking into ? (easiest fix : use the
ByteArrayOut/InputStream swap ).
kind regards,
Dennis