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From "Daniel Wikman" <>
Subject Re: TelnetClient problem?
Date Sat, 09 Dec 2006 16:04:07 GMT

Got it! Exellent answer, I'll have a look at it again, now I am using 
ProcessBuilder instead,
since that works..., but using a library feels safer...



>From: Rory Winston <>
>Reply-To: "Jakarta Commons Users List" <>
>To: Jakarta Commons Users List <>,  
>Subject: Re: TelnetClient problem?
>Date: Tue, 05 Dec 2006 23:35:36 +0000
>Hi Daniel
>This is handled in TelnetClient::_connectAction(). The output stream is 
>wrapped in a ToNetASCIIOutputStream, which replaces all \n with \r\n. A 
>quick fix for your serial blackbox system may (I havent tried this) be to 
>replace the line
>__output = new ToNetASCIIOutputStream(new TelnetOutputStream(this));
>__output = new BufferedOutputStream(new TelnetOutputStream(this));
>protected void _connectAction_() throws IOException
>    {
>        super._connectAction_();
>        InputStream input;
>        TelnetInputStream tmp;
>        if (FromNetASCIIInputStream.isConversionRequired())
>            input = new FromNetASCIIInputStream(_input_);
>        else
>            input = _input_;
>        tmp = new TelnetInputStream(input, this, readerThread);
>        if(readerThread)
>        {
>            tmp._start();
>        }
>      .....
>        __input = new BufferedInputStream(tmp);
>        __output = new ToNetASCIIOutputStream(new 
>    }
>We could make this configurable in some way if necessary.
>Daniel Wikman wrote:
>>Hi all!
>>I wonder if someone has seen this and know a "cure" for this behaviour. I 
>>wrote a program based on the TelnetClient class. When using 
>>the program towards a Unix or Linux box directly everything works fine, 
>>but when using telnet towards a serial blackbox, I always get an extra 
>>newline added when writing commands (it seems like TelnetClient or the 
>>underlying stream makes line terminations a la windows... The fun part is 
>>that if I make my own TelnetClient program based on 
>>Java.util.ProcessBuilder it works just fine. I'd really like to make my 
>>program independent of the "/usr/bin/telnet" to make it work on windows 
>>platform as well. Does anyone know what option that controls this in 
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