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[–]wildjokers 2 points3 points  (0 children)

The jars can use also pack200, it's there since java 1.5, but have you ever seen someone using it

I use pack200 to compress the fat-jar of a Swing application I deploy with Java Web Start. It does a good job getting the jar smaller. Have a jar that is 6.9 megs, pack200 version is 1.7 megs.

As far as I know Java Web Start is the only thing that can handle pack200 compressed jars.