Problems deploying sounds with jar/game

I've almost finished my game, for as far as software can ever be finished. Now I've troubles creating a jar file that contains all of the game's resources. Within my IDE (Eclipse) the game finds & plays .wav files correctly using:
for(int i = 0; i< names.length;i++){
     ais = null;
     cl = this.getClass().getClassLoader();
     ais = AudioSystem.getAudioInputStream(cl.getResourceAsStream("sound/" + names));
     clips[i] = (Clip) AudioSystem.getLine(new DataLine.Info(Clip.class, ais.getFormat()));
     clips[i].open(ais);
But when I start the game using the jar file I get the following exception:
java.lang.NullPointerException
        at java.io.FilterInputStream.mark(FilterInputStream.java:179)
        at com.sun.media.sound.WaveFileReader.getAudioFileFormat(WaveFileReader.
java:94)
        at com.sun.media.sound.WaveFileReader.getAudioInputStream(WaveFileReader
.java:237)
        at javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:
680)
        at field.TestFrame.initSoundContext(TestFrame.java:657)
        at field.TestFrame.init(TestFrame.java:157)
        at field.TestFrame.<init>(TestFrame.java:112)
        at field.TestFrame.main(TestFrame.java:117)
Exception in thread "main" java.lang.NullPointerException
        at field.TestFrame.initSoundContext(TestFrame.java:672)
        at field.TestFrame.init(TestFrame.java:157)
        at field.TestFrame.<init>(TestFrame.java:112)
        at field.TestFrame.main(TestFrame.java:117)Yes, I've made sure the .wav files are in the jar ;)
Does anyone know what the problem could be? Help ?-)
Greetings
Coen

Thank you for your reply, but I didn't get any further. I tried you code, but got another error.I use the same code (as described at the top) to load my images, but no problems there (?) I'll try to fix the problem myself, but suggestions would be very helpfull :)
Exception:
java.io.IOException: mark/reset not supported
at java.io.InputStream.reset(InputStream.java:329)
at java.io.FilterInputStream.reset(FilterInputStream.java:204)
at com.sun.media.sound.WaveFileReader.getAudioFileFormat(WaveFileReader.
java:128)
at com.sun.media.sound.WaveFileReader.getAudioInputStream(WaveFileReader
.java:237)
at javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:
680)
at field.TestFrame.initSoundContext(TestFrame.java:658)
at field.TestFrame.init(TestFrame.java:157)
at field.TestFrame.<init>(TestFrame.java:112)
at field.TestFrame.main(TestFrame.java:117)
Exception in thread "main" java.lang.NullPointerException
at field.TestFrame.initSoundContext(TestFrame.java:673)
at field.TestFrame.init(TestFrame.java:157)
at field.TestFrame.<init>(TestFrame.java:112)
at field.TestFrame.main(TestFrame.java:117)
Thanks in advance for any help offered :)

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