Client error

im trying to jar my client and make the cache download from a website to the users home so the client is more universal. its really starting to piss me off. it wont connect to the server and i get the this error when i debug it.

Code :

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java.io.FileNotFoundException: nullIcache31\sprites.dat (The system cannot find
the path specified)
        at java.io.RandomAccessFile.open(Native Method)
        at java.io.RandomAccessFile.<init>(Unknown Source)
        at java.io.RandomAccessFile.<init>(Unknown Source)
        at CustomSprites.loadCustomSprites(CustomSprites.java:11)
        at Gui.<init>(Gui.java:109)
        at Gui.main(Gui.java:38)

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here is my code

Code :

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    public static void loadCustomSprites(client var_client) {
        try {
            RandomAccessFile cache = new RandomAccessFile(System.getProperty("home") + "Icache31/sprites.dat", "r");
            RandomAccessFile cache_idx = new RandomAccessFile(System.getProperty("home") + "Icache31/sprites.idx", "r");
            Cache ch = new Cache(cache, cache_idx, 0);
            Map<String, Image> images = new HashMap<String, Image>();
            for(int i=0; i < ch.getNumFiles(); i++) {
                byte[] buffer = ch.getFile(i);
                if(buffer == null) {
                    continue;
                }
                DataStream str = new DataStream(buffer.length, 0);
                System.arraycopy(buffer, 0, str.inBuffer, 0, buffer.length);
                String name = str.readString();
                Image img = Toolkit.getDefaultToolkit().createImage(str.inBuffer, str.readOffset(), str.inBuffer.length - str.readOffset());
                if(img != null) {
                    images.put(name, img);
                }
            }
            MediaTracker mediaTracker = new MediaTracker(var_client);
            for(Image i : images.values()) {
                mediaTracker.addImage(i, 0);
            }
            try {
                mediaTracker.waitForAll();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            for(String name : images.keySet()) {
                Image i = images.get(name);
                if(i == null) {
                    continue;
                }
                int[] pixels = new int[i.getWidth(null) * i.getHeight(null)];
                PixelGrabber pixelgrabber = new PixelGrabber(i, 0, 0, i.getWidth(null), i.getHeight(null), pixels, 0, i.getWidth(null));
                pixelgrabber.grabPixels();
                sprites.put(name, pixels);
            }
            //System.out.println("" + sprites.size() + " sprites successfully loaded!");
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

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when i did "user.home" it went to C:/OwnerIcache31/sprites.dat

wich is not right.. please help!

Well, why not try specifying right paths?

because the point of it is so that any user can download 1 client and use it no matter what OS they have.