I would try to verify that the images package(directory) is actually in the jar file. Depending upon how you created the jar, those files may have gone into the root of the jar, in which case "images/flag2.gif" would not resolve correctly.

jar cmf mainClass.txt MineSweeper.jar *.class images/*.gif

puts the folder there and everything... Extracted it too, it's there...

Not sure what to tell you then, because that exact jar structure and loading code works just fine for me.

Here, maybe you can take a look at my code... I cut out most of the gooie/extra stuff so you can text it out..

Right clicking should show a flag then a ? then nothing.

If you extract the jar file, you will find my source code, the images, and the compiled .class files. If you run it, the program runs, but the icons dont show.
http://www.fileden.com/files/2008/2/...ineSweeper.jar

I'm not using getResource atm so extracting the jar and moveing the image folder next to the jar will show icons. When I try to use getClass().getResource(), i get nullpointererror...

Hopefully this helps you see what I see..

Changing that code to use getClass().getResource() works perfectly on my machine. Attaching the revised jar (I had to put it in a zip file since it won't allow me to attach a .jar)

copying the code right out of the java file into eclipse gave me the same problem so I decided to delete the entire project and start copying the code from the java files from scratch. Now it's working.....

meh.. Thanks for all your time and help Ezzaral. you deserve more rep points