duration of audio file

[Saran185]

hi . i have my code below to get the duration of audio file.
but i get an exception error. can anyone fix the bug and help me in getting the duration of the audio file..
plssss..

import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.DataLine;
import java.lang.*;
import java.io.*;
import javax.sound.sampled.*;

public class Main {
  public static void main(String[] argv) throws Exception {

    File f1 = new File("c:/program files/java/jdk1.6.0/bin/demo.mp3");
            AudioInputStream fis =
             AudioSystem.getAudioInputStream(f1);
            System.out.println("File AudioFormat: " + fis.getFormat());
            AudioInputStream ais = AudioSystem.getAudioInputStream(
             AudioFormat.Encoding.PCM_SIGNED,fis);
            AudioFormat af = ais.getFormat();
			// int frmlength = (int)ais.getByteLength();
            System.out.println("AudioFormat: " + af.toString());
             DataLine.Info info = new DataLine.Info(SourceDataLine.class,af);
    Clip clip = (Clip) AudioSystem.getLine(info);
    double durationInSecs = clip.getBufferSize()
        / (clip.getFormat().getFrameSize() * clip.getFormat().getFrameRate());
		System.out.println("duration new : "+durationInSecs);
   

  }
}