UDP Voice Chat - Play With The Index Of Mixer Info Array

I was trying to make a UDP voice chat but i couldn't make the receive method work! so i just move on to work with TCP. I found a simple code that i found it pretty easy to understand,but i couldn't make it work, always stuck within exception.

Here is the output I got:

Available mixers:

Java Sound Audio Engine

Microsoft Sound Mapper

WinOS,waveOut,multi threaded

java.lang.IllegalArgumentException: Line unsupported: interface TargetDataLine supporting format PCM_SIGNED, 8000.0 Hz, 16 bit, mono, little-endian, audio data

And here is the code

sender:

Java Code:

package sender;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import javax.sound.sampled.AudioFormat;

[Code] ....

I tried to play with the index of mixerInfo array in the line

Java Code:

Mixer mixer = AudioSystem.getMixer(mixerInfo[1]); mh_sh_highlight_all('java');

But nothing happened. How I can fix that?