First. I know that there already exists a variety of topics on how to access the image inside the jar file. Second. I tried many options and none of them did not work. Of cours
File.separator in getResource() - it always takes / (think of it as an URL HREF)./ to ensure the class loader searches from the root of the class-path, rather than relative to the package of the class.good.PNG is the correct case. It does not matter on the Windows file-system, but getResource() is case-sensitive.