As per Java web start where does the jar file get downloaded on a client machine?
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In case of a Windows machine, you could go to the control panel and click on Java Control Panel to find the location of the Java Cache.
In my case it shows: C:\Documents and Settings\user1\Application Data\Sun\Java\Deployment\cache

ria
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3The Java Control Panel is available on Linux & Solaris as well. On GNOME it can usually be found under System->Preferences->Java – Bozhidar Batsov Apr 14 '10 at 08:13
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Default seems to be C:\Users\{user}\AppData\LocalLow\Sun\Java\Deployment\cache – Yeikel Feb 21 '19 at 16:36
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On Mac
/Users/username/Library/Caches/Java/cache/
Just for fun:
I deployed a small game and found its jar file in
/Users/username/Library/Caches/Java/cache/6.0/42/1d3d9f6a-640bd5ed
The .jar was removed, if you want to run or decompile it, rename it with .jar
UPDATE (OS X El Capitan)
/Users/username/Library/Application Support/Oracle/Java/Deployment/cache

mohdajami
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In case of a Linux machine, I have it on :
/home/bakkal/.java/deployment/cache/
where /home/bakkal is just my personal home folder.

bakkal
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Keep in mind that the location on windows has changed. It was different in java 6 (compared to java 5).

Thirler
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