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norm, thank you for your help but looking into abit further, i don't beleive what i'm trying to do will work.

the jar file i have connects to another device and from there it runs. after it...

Norm,
so it's as simple as unpacking the jar file. grab all my *.java files and then recompile all those .java files so i get .class files then package it all up as a nice jar file again?

Tjstretch, thank you for the reply

I'm not sure.. i'm java stupid. all i know is that i have this jar file and would like to run it under a newer release rather than trying to get jre1.2.2...

Hi new to the forum :)

quick question for you guru's.

I have an old .jar file which works on jre 1.2.2 however will not work on anything after that version.

Poking around i read that javac...