Audio capture and converting the audio data to .wav file

hi,
i am new to applet and javax.sound and trying to build online recorder SDK in applet. I could captured the audio data and play the sound from microphone and also store the audio data to .wav file successfully. But when try to play that file from Window Media Player, i got the message "Windows Media Player cannot play the file. The file is either corrupt or the Player does not support the format you are trying to play." I have tried it all in different way but it's not working for last 5-6 days. Is there anyone who could help me , my work is stocked b'coz of this.
Thanks

this is the thread in which i am storing the audio data from audio stream to .wav file
class CaptureThread extends Thread{
                    public void run(){
                                  AudioFileFormat.Type fileType = AudioFileFormat.Type.WAVE;
                                  File audioFile = new File("junk.wav");
                                   try{
                                   final AudioFormat format = getFormat();
                                         line.open(format);
                                      line.start();
                                         AudioSystem.write(
                                          new AudioInputStream(line),
                                          fileType,audioFile);
                                    }catch (Exception e){
                                         e.printStackTrace();
                                      }//end catch
                               }//end run
                    }//end inner class CaptureThread

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