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The key thing for an excutable jar file is to add a manifest file to the jar (.mf file) that states the top level class with the void main(String[]) method in it. I can't think of a program I use off the top of my head that does this (maybe PrettyPrinter), generally people just provide a jar file and .bat/.sh files to execute the class.
Ahh, I finally thought of a program that uses an excutable jar. Pooka, an all Java email client does. Here is the manifest (I cut all the digest stuff off the bottom):
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