It appears different service take SPI values in different way....

I tried to write dummy SPI, and load from META-INF/services directory,
works fine.
but for this sample:
http://www.javaworld.com/javaworld/jw-11-2000/jw-1103-mp3.html

I tried the following code to call mp3.jar
import java.io.*;
import javax.sound.sampled.*;

public class A {

 public static void main(String[] args) {
         String fName = "a.mp3";

     new A(fName);
 }

 public A(String sound) {
   try {

     AudioInputStream stream = AudioSystem.getAudioInputStream(new
File(sound));

     // At present, ALAW and ULAW encodings must be converted
     // to PCM_SIGNED before it can be played
     AudioFormat format = stream.getFormat();

     if (format.getEncoding() != AudioFormat.Encoding.PCM_SIGNED) {
         format = new AudioFormat(
                  AudioFormat.Encoding.PCM_SIGNED,
                  format.getSampleRate(),
                  format.getSampleSizeInBits()*2,
                  format.getChannels(),
                  format.getFrameSize()*2,
                  format.getFrameRate(),
                  true);        // big endian
          stream = AudioSystem.getAudioInputStream(format, stream);
          System.out.println("\nConverted stream:");
          printFormat(format);
     }

     DataLine.Info info = new DataLine.Info(Clip.class,
stream.getFormat());
     Clip clip = (Clip) AudioSystem.getLine(info);

     // Add a listener for line events
     clip.addLineListener(new LineListener() {
       public void update(LineEvent evt) {
           if (evt.getType() == LineEvent.Type.STOP) {
              System.out.println("Sound stopped.");
              System.exit(0);
           }
       }
     });

     System.out.println("Playing sound...");
     clip.open(stream);
     clip.start();
  } catch (IOException e) {
    e.printStackTrace();
  } catch (LineUnavailableException e) {
    e.printStackTrace();
  } catch (UnsupportedAudioFileException e) {
    e.printStackTrace();
  }
 }
}

I always get javax.sound.sampled.UnsupportedAudioFileException: could
not get audio input stream from input file

error. And the class specified in META-INF/services directory never
work.....

I checked  com.sun.media.sound.JDK13Services.getProviders method
it appears need priviledge to return values, but I don't know which
priviledge and permission to run that process. And JDK13Services catch
throwable without print any message!!!!!

Any more suggestion?

Thanks.