private byte[] resourceToByteArray(String resName) throws IOException {
ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
InputStream iresStream = getClass().getResourceAsStream(resName);
int bytesRead = 0;
byte[] tmp = new byte[4096];

while ( (bytesRead = iresStream.read(tmp, 0, 4096)) > -1 )
byteStream.write(tmp, 0, bytesRead);

iresStream.close();
// JDocs: "Closing a ByteArrayOutputStream has no effect."

return byteStream.toByteArray();
}



...


here comes the real code

...

try {
icon = new ImageIcon(resourceToByteArray("u12.jpg"));
icon2 = new ImageIcon(resourceToByteArray("zw1217.jpg"));
icon3 = new ImageIcon(resourceToByteArray("17.jpg"));
icon4 = new ImageIcon(resourceToByteArray("ue18.jpg"));
}
catch (IOException ex) {
// Fehlerbehandlung nach Wunsch...
}

...