Problem in loading images from ClassLoader

I m developing a java based application. My application is GUI based. I add an image in a button. This image is placed in jar file. I'm trying to read the image with the help of the class loader, my code goes like this:
URL aCutImageURL = this.getClass().getClassLoader().getResource("CutImage.gif");
ImageIcon aCutImageIcon = new ImageIcon(aCutImageURL);
JButton aBtn = new JButton(aCutImageIcon);
But, when i try to get the image through the class loader sometimes
it works properly but sometimes it returns null, throwing a NullPointerException.
I've also tried to load the image using:
URL aCutImageURL = this.getClass().getResource("CutImage.gif");
but the problem is still there.
Is there any other way to load the images from the jar??
Please reply soon, its urgent!!!

Here is a sample code to get an image in a JarFile :
     public static Image getImage(String jarFileName, String fileName) {
          BufferedImage image = null;
          try {
               JarFile jar = new JarFile(new File(jarFileName), false, JarFile.OPEN_READ);
               JarEntry entry = jar.getJarEntry(fileName);
               BufferedInputStream stream = new BufferedInputStream(jar.getInputStream(entry));
               image = ;
          catch (Exception ex) {
     }I hope this helps,

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