Click on a icon has to run another runnable jar

I have created a runnable jar of my application. I want to change the default icon of that jar. Searched for almost two days and most o开发者_Go百科f the sites said it depends on OS, can't be changed. So I think to do like this, by clicking on a different icon, my runnable has to run. Is there any way to achieve that?

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I want to change the default icon..

Launch the app. using Java Web Start. As part of the desktop integration it offers the ability to set an icon for the desktop shortcut (or menu item).

I need to run that jar in both windows an mac.

JWS works in 'both' Windows, *nix & Mac.