You were almost there. Try this:
FileInputStream fs = null;
try {
fs = new FileInputStream(wavSound);
AudioClip clip = new JavaSoundAudioClip(fs);
clip.play();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Or for a more complete class that you can use as-is:
Minicraft/Sound.java