javasound bufferlength problem on Linux

I'm finding that on my Linux machine, if I don't comment out
the 
following code:

//            // 1. Changing buffer size. The default buffer
size (for 
javasound)
//            // is 125 milliseconds - 1/8 sec. On MacOS
this leeds to 
exception and
//            // no audio capture. 30 value of buffer fix
the problem 
and is ok
//            // when using some pstn gateways
//            // 2. Changing to 60. When it is 30 there are
some issues
//            // with asterisk and nat(we don't start to
send stream and so
//            // asterisk rtp part doesn't notice that we
are behind nat)
//            Control ctl = (Control)
//                
dataSource.getControl("javax.media.control.BufferContro
l");
//
//            if(ctl != null)
//            {
//               
((BufferControl)ctl).setBufferLength(60);//buffers in
//            }

That I get an error:

Cannot open audio device for input: 
javax.sound.sampled.LineUnavailableException: line with
format 
PCM_SIGNED 44100.0 Hz, 16 bit, stereo, 4 bytes/frame,
little-endian not 
supported.
Failed to configure: com.sun.media.ProcessEngine184be29
  IO exception: line with format PCM_SIGNED 44100.0 Hz, 16
bit, stereo, 
4 bytes/frame, little-endian not supported.

And the media service won't start.

I'm using ubuntu gutsy gibbon with Sun JDK 1.6.

Ken


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