Thread: Need help to export .jar file

I have created one program with GUI using Eclipse. I need to export it as a runnable .jar file. I do exactly as I seen on some tutorials.
My problem is the following:
Many of my buttons have ImageIcons. They have links to a Source Folder that I have in my project, where .jpg files of the Icons are located. The problem is that I do not find a way to make these icons visible after I run the .jar file.

Here it is a piece of code having the methods I used to setIcons and how are the looking in my Eclipse Project.

image.jpg

Is there any problem that files are .jpg? Do I need to place them in another kind of folder?

I tried to do like that but I only got nullpointer exceptions. I ended with creating JButton class and drawing each button there inside the paintComponent method. Like that I no longer needed any resource file.