Found and fixed a bug in FTPClient class in Commons Net project.

[Bi...@idx.com]

Hi,

I tried to use FTP in my Ant task, so I downloaded the latest 
commons-net-1.4.0.jar and jakarta-oro-2.0.8.jar, however, I got the 
following error:

org.apache.commons.net.ftp.parser.ParserInitializationException: Error 
initializing parser

I downloaded the source code and found the problem. It's in getSystemName 
method of FTPClient class in Commons Net project. The reason is that for 
some system, such as HP's NonStop (Tandem) platform, "SYST" command is not 
understood, so __systemName will be null thus causing the error above.

I am enclosing the modified method below:

    public String getSystemName() throws IOException
    {
      //if (syst() == FTPReply.NAME_SYSTEM_TYPE)
      // Technically, we should expect a NAME_SYSTEM_TYPE response, but
      // in practice FTP servers deviate, so we soften the condition to
      // a positive completion.
        if (__systemName != null) {
            return __systemName;
        }

        if (__systemName == null && FTPReply.isPositiveCompletion(syst())) 
{
            __systemName = 
((String)_replyLines.elementAt(0)).substring(4);
        }
        else {
            //For some system, such as HP's NonStop (Tandem) platform, we 
get:
            //500 'SYST': command not understood. Defaults to UNIX for the 
case.
            __systemName = "UNIX";
        }

        return __systemName;
    }

If anybody can take a look to see if it's appropriate to include the fix 
to the project, that'll be greatly appreciated.

BTW, I sent to the group for three times with an attachment of 
FTPClient.java and all three emails got bounced back. It seems we can't 
use attachment.

Thanks!

Bing

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