Java - recording from mixer

I have a problem connected with my previous question. I want to record audio from mixer (speakers), I'm using javax.sound. I have to set up audioFormat and I don't know what to type there :/ Using class ListMixer (which I found here -> http://forums.oracle.com/forums/thread.jspa?threadID=2198477&tstart=2), I write something like this: http://forums.oracle.com/forums/thread.jspa?threadID=2198477&tstart=2 but I don't have any info about sample rate (unknown sample rate). Program is throwing this exception:

java.lang.IllegalArgumentException: Line unsupported: interface TargetDataLine supporting format PCM_UNSIGNED 44100.0 Hz, 8 bit, mono, 4 bytes/frame,

Code:

package sound;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.sound.sampled.*;

public class AudioCapture02 extends JFrame{

  boolean stopCapture = false;
  ByteArrayOutputStream byteArrayOutputStream;
  AudioFormat audioFormat;
  TargetDataLine targetDataLine;
  AudioInputStream audioInputStream;
  SourceDataLine sourceDataLine;

  public AudioCapture02(){//constructor
    final JButton captureBtn =
                          new JButton("Capture");
    final JButton stopBtn = new JButton("Stop");
    final JButton playBtn =
                         new JButton("Playback");

    captureBtn.setEnabled(true);
    stopBtn.setEnabled(false);
    playBtn.setEnabled(false);

    //Register anonymous listeners
    captureBtn.addActionListener(
      new ActionListener(){
        public void actionPerformed(
                                 ActionEvent e){
          captureBtn.setEnabled(false);
          stopBtn.setEnabled(true);
          playBtn.setEnabled(false);
          //Capture input data from the
          // microphone until the Stop button is
          // clicked.
          captureAudio();
        }//end actionPerformed
      }//end ActionListener
    );//end addActionListener()
    getContentPane().add(captureBtn);

    stopBtn.addActionListener(
      new ActionListener(){
        public void actionPerformed(
                                 ActionEvent e){
          captureBtn.setEnabled(true);
          stopBtn.setEnabled(false);
          playBtn.setEnabled(true);
          //Terminate the capturing of input data
          // from the microphone.
          stopCapture = true;
        }//end actionPerformed
      }//end ActionListener
    );//end addActionListener()
    getContentPane().add(stopBtn);

    playBtn.addActionListener(
      new ActionListener(){
        public void actionPerformed(
                                 ActionEvent e){
          //Play back all of the data that was
          // saved during capture.
          playAudio();
        }//end actionPerformed
      }//end ActionListener
    );//end addActionListener()
    getContentPane().add(playBtn);

    getContentPane().setLayout(new FlowLayout());
    setTitle("Capture/Playback Demo");
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setSize(250,70);
    setVisible(true);
  }//end constructor

  //This method captures audio input from a
  // microphone and saves it in a
  // ByteArrayOutputStream object.
  private void captureAudio(){
    try{
      //Get and display a list of
      // available mixers.
      Mixer.Info[] mixerInfo = AudioSystem.getMixerInfo();
      System.out.println("Available mixers:");
      for(int cnt = 0; cnt < mixerInfo.length;
                                          cnt++){
        System.out.println(mixerInfo[cnt].
                                      getName());
      }//end for loop

      //Get everything set up for capture
      audioFormat = new AudioFormat(AudioFormat.Encoding.PCM_UNSIGNED, 44100.0F, 8, 1, 4, 44100.0F,
                        false);


      DataLine.Info dataLineInfo =
                            new DataLine.Info(
                            TargetDataLine.class,
                            audioFormat);
      ListMixers lm = new ListMixers();
      lm.listAll(new PrintWriter(System.out));

      System.out.println(" AKTUALNY => "+mixerInfo[0].getName());
      Mixer mixer = AudioSystem.getMixer(mixerInfo[0]);

      //Get a TargetDataLine on the selected
      // mixer.
      targetDataLine = (TargetDataLine)
                     mixer.getLine(dataLineInfo);
      //Prepare the line for use.
      targetDataLine.open(audioFormat);
      targetDataLine.start();

      //Create a thread to capture the microphone
      // data and start it running.  It will run
      // until the Stop button is clicked.
      Thread captureThread = new CaptureThread();
      captureThread.start();
    } catch (Exception e) {
      System.out.println(e);
      System.exit(0);
    }//end catch
  }//end captureAudio method

  //This method plays back the audio data that
  // has been saved in the ByteArrayOutputStream
  private void playAudio() {
    try{
      //Get everything set up for playback.
      //Get the previously-saved data into a byte
      // array object.
      byte audioData[] = byteArrayOutputStream.
                                   toByteArray();
      //Get an input stream on the byte array
      // containing the data
      InputStream byteArrayInputStream =
             new ByteArrayInputStream(audioData);
      AudioFormat audioFormat = getAudioFormat();
      audioInputStream = new AudioInputStream(
                    byteArrayInputStream,
                    audioFormat,
                    audioData.length/audioFormat.
                                 getFrameSize());
      DataLine.Info dataLineInfo =
                            new DataLine.Info(
                            SourceDataLine.class,
                            audioFormat);
      sourceDataLine = (SourceDataLine)
               AudioSystem.getLine(dataLineInfo);
      sourceDataLine.open(audioFormat);
      sourceDataLine.start();

      //Create a thread to play back the data and
      // start it  running.  It will run until
      // all the data has been played back.
      Thread playThread = new PlayThread();
      playThread.start();
    } catch (Exception e) {
      System.out.println(e);
      System.exit(0);
    }//end catch
  }//end playAudio

  //This method creates and returns an
  // AudioFormat object for a given set of format
  // parameters.  If these parameters don't work
  // well for you, try some of the other
  // allowable parameter values, which are shown
  // in comments following the declartions.
  private AudioFormat getAudioFormat(){
    float sampleRate = 8000.0F;
    //8000,11025,16000,22050,44100
    int sampleSizeInBits = 16;
    //8,16
    int channels = 1;
    //1,2
    boolean signed = true;
    //true,false
    boolean bigEndian = false;
    //true,false
    return new AudioFormat(
                      sampleRate,
                      sampleSizeInBits,
                      channels,
                      signed,
                      bigEndian);
  }//end getAudioFormat
//=============================================//

//Inner class to capture data from microphone
class CaptureThread extends Thread{
  //An arbitrary-size temporary holding buffer
  byte tempBuffer[] = new byte[10000];
  public void run(){
    byteArrayOutputStream =
                     new ByteArrayOutputStream();
    stopCapture = false;
    try{//Loop until stopCapture is set by
        // another thread that services the Stop
        // button.
      while(!stopCapture){
        //Read data from the internal buffer of
        // the data line.
        int cnt = targetDataLine.read(tempBuffer,
                              0,
                              tempBuffer.length);
        if(cnt > 0){
          //Save data in output stream object.
          byteArrayOutputStream.write(tempBuffer,
                                      0,
                                      cnt);
        }//end if
      }//end while
      byteArrayOutputStream.close();
    }catch (Exception e) {
      System.out.println(e);
      System.exit(0);
    }//end catch
  }//end run
}//end inner class CaptureThread
//===================================//
//Inner class to play back the data
// that was saved.
class PlayThread extends Thread{
  byte tempBuffer[] = new byte[10000];

  public void run(){
    try{
      int cnt;
      //Keep looping until the input read method
      // returns -1 for empty stream.
      while((cnt = audioInputStream.read(
                      tempBuffer, 0,
                      tempBuffer.length)) != -1){
        if(cnt > 0){
          //Write data to the internal buffer of
          // the data line where it will be
          // delivered to the speaker.
          sourceDataLine.write(tempBuffer,0,cnt);
        }//end if
      }//end while
      //Block and wait for internal buffer of the
      // data line to empty.
      sourceDataLine.drain();
      sourceDataLine.close();
    }catch (Exception e) {
      System.out.println(e);
      System.exit(0);
    }//end catch
  }//end run
}//end inner class PlayThread
//=============================================//
class ListMixers {
    PrintWriter out;

     void listAll(final PrintWriter out) {
        this.out = out;
        Mixer.Info[] aInfos = AudioSystem.getMixerInfo();
        for (int i = 0; i < aInfos.length; i++) {
            try {
                Mixer mixer = AudioSystem.getMixer(aInfos[i]);
                out.println(""+i+": "+aInfos[i].getName()+", "
                        +aInfos[i].getVendor()+", "
                        +aInfos[i].getVersion()+", "
                        +aInfos[i].getDescription());

                printLines(mixer, mixer.getSourceLineInfo());
                printLines(mixer, mixer.getTargetLineInfo());
            } catch (Exception e) {
                out.println("Exception: "+e);
            }
            out.println();
        }
        if (aInfos.length == 0) {
            out.println("[No mixers available]");
        }
    }

    void printLines(Mixer mixer, Line.Info[] infos) {
        for (int i = 0; i < infos.length; i++) {
            try {
                if (infos[i] instanceof Port.Info) {
                    Port.Info info = (Port.Info) infos[i];

                    out.println("  Port " + info);
                }
                if (infos[i] instanceof DataLine.Info) {
                    DataLine.Info info = (DataLine.Info) infos[i];

                    out.println("  Line " + info + " (max. " +
                                mixer.getMaxLines(info) + " simultaneously): ");
                    printFormats(info);
                }
                Line line = mixer.getLine(infos[i]);

                if (!(line instanceof Clip)) {
                    try {
                        line.open();
                    }
                    catch (LineUnavailableException e) {
                        out.println("LineUnavailableException when trying to open this line");
                    }
                }
                try {
                    printControls(line.getControls());
                }
                finally {
                    if (!(line instanceof Clip)) {
                        line.close();
                    }
                }
            }
            catch (Exception e) {
                out.println("Exception: " + e);
            }
            out.println();
        }
    }

    void printFormats(DataLine.Info info) {
        AudioFormat[] formats = info.getFormats();
        for (int i = 0; i < formats.length; i++) {
            out.println("  "+i+": "+formats[i]
                    +" ("+formats[i].getChannels()+" channels, "
                    +"frameSize="+formats[i].getFrameSize()+", "
                    +(formats[i].isBigEndian()?"big endian":"little endian")
                    +")");
        }
        if (formats.length == 0) {
            out.println("  [no formats]");
        }
        out.println();
    }

    void printControls(Control[] controls) {
        for (int i = 0; i