Game behaves weird when sound is playing

Here is my Sound class (im completely clueless of what all this stuff means).

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class Sound{
   private AudioFileFormat baseFileFormat;
   private AudioFormat baseFormat,decodedFormat;
   private AudioInputStream din,in;
   private AudioFileFormat.Type type;
   private float frequency;
   public Sound(String filename){
      try{
         baseFileFormat = AudioSystem.getAudioFileFormat(new File(filename));
      }   catch(UnsupportedAudioFileException ex){
         System.out.println("Audio File not Supported");   
      }   catch(IOException ex2){}
      baseFormat = baseFileFormat.getFormat();
      type = baseFileFormat.getType();
      frequency = baseFormat.getSampleRate();
      in=null;
      try{
         in= AudioSystem.getAudioInputStream(new File(filename));
      }   catch(UnsupportedAudioFileException ex){}
         catch(IOException ex2){}
      din = null;
      baseFormat = in.getFormat();
      decodedFormat =new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
                    baseFormat.getSampleRate(),
                    16,
                    baseFormat.getChannels(),
                    baseFormat.getChannels() * 2,
                    baseFormat.getSampleRate(),
                    false);
      din = AudioSystem.getAudioInputStream(decodedFormat, in);
      //in.close();
   }
   public void play(){
      try{
         rawplay(decodedFormat, din);
      }   catch(LineUnavailableException ex){}
         catch(IOException ex2){}
   }   
   public void stop(){
      try{
         in.close();
      }   catch(IOException ex2){}
   }
   private void rawplay(AudioFormat targetFormat,AudioInputStream din)
         throws IOException, LineUnavailableException{
       byte[] data = new byte[4096];
        SourceDataLine line = getLine(targetFormat);
        if (line != null){
          line.start();
          int nBytesRead = 0, nBytesWritten = 0;
          while (nBytesRead != -1){
              nBytesRead = din.read(data, 0, data.length);
              if (nBytesRead != -1)
               nBytesWritten = line.write(data, 0, nBytesRead);
          }
          line.flush();
          line.stop();
          line.close();
          din.close();
        }
   }
   private SourceDataLine getLine(AudioFormat audioFormat) throws LineUnavailableException{
        SourceDataLine res = null;
        DataLine.Info info =
          new DataLine.Info(SourceDataLine.class, audioFormat);
        res = (SourceDataLine) AudioSystem.getLine(info);
        res.open(audioFormat);
        return res;
   }
}

When i try playing a sound with it, the game freezes untill the sound stops playing. When i try playing it again, it wont play. The stop() function does not stop the sound. I have another question: how would i implement loop() function (one that works properly). To make long story short: is there a library-thingy for a java application which provides play(), stop() and loop() functions? Sad

/** within the Sound class block add a Thread member */
Thread player = null;
/** add a new Thread for the play() to launch in the background **/
public Thread playInBg() {
// you may add some checks and conditions for avoiding simultaneous multiple threadings
if(player instanceof Thread) {
if(player.isAlive() && !player.isInterrupted()) {
player.interrupt();
}
}
Thread t = player = new Thread(new Runnable() {public void run() { play(); Thread.currentThread().interrupt();}}, "T-soundplayer");
t.start();
return t;
}