Java application updating itself

Hi,
I'm making update manager program for my Java application.It downloads updated jarfile from the net and that file should replace the file being currently used.
Could someone give a hint what would be the best way to modify the jar-file that is currently being used by virtual machine (or is there any).
The optimal way would be that the code in the original jar file could somehow change itself (and then restart etc) but failing that the second best alternative would be making a second java -aplication which does the updating. In that case I'd need an advice how to start java application from another application in device indepentend way (prefereably not with Runtime.exec().
Thanks in advance.
r2

The best way would be to use Java Web Start, which does all of that, instead of writing your own.

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