private void loadAndPlayOgg()
  {
    InputStream input = getClass().getResourceAsStream("explosion.ogg");    
    OggInputStream ogg = new OggInputStream(input);
    
    int format = ogg.getFormat();
    int rate   = ogg.getRate();    
    AudioFormat audioFormat = // How to create an AudioFormat with only these two parameters ??
    
    
    // I think that the size of 'inputBuffer' should be equal to the size of the decoded OGG-file,
    // but I don't know this size, so what now ? 
    
    byte[] inputBuffer = new byte[1024];
    try
    {      
      int readSize = 0;      
      while((readSize = input.read(inputBuffer, 0, 1024)) > -1)
      {
        ogg.read(inputBuffer, 0, readSize); 
      }
    }
    catch (IOException e)
    {
      e.printStackTrace();
    }
    
    Clip clip = loadClip(inputBuffer, audioFormat);    
    if (clip != null)
    {
      clip.start();
    }   
    
  }
  
  private Clip loadClip(byte[] data, AudioFormat format)
  { 
    DataLine.Info info = new DataLine.Info(Clip.class, format);
    if (!AudioSystem.isLineSupported(info))
    {
      System.out.println("Unsupported Clip File");
      return null;
    }

    Clip clip = null;
    try
    {
      clip = (Clip) AudioSystem.getLine(info);
      clip.open(format, data, 0, data.length);
    }
    catch (LineUnavailableException e)
    {
      e.printStackTrace();
    }    
    return clip;
  }

URL urlClasses = getClass().getResource("");
String urlText = urlClasses.toString();   

String pathImages = null;
if (urlText.startsWith("jar"))
{  
  pathImages= urlText.replaceAll("abc", "images"); 
}
else if (urlText.startsWith("file"))
{
  int i = urlText.indexOf("classes");
  pathImages = urlText.substring(0, i) + "images/";
}
        
final String IMAGE = "myImage.png";

URL urlImages = null;
try { urlImages = new URL(pathImages + IMAGE); }
catch (MalformedURLException e) { e.printStackTrace(); }

// 'abc' is the name of the root-package, 
// 'images' is the name of the resource-directory and is 
// placed in the same directory as 'src' and 'classes'.