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This question popped up when I tried to download a game for dolphin emu. The site isohunt recommended I use vuze and vuze requires jre. Silly me, as a windows noob, I immediately thought I d have to have the latest update. Well I got openjdk 7 and then I realized and I had openjdk 6 and 7. So I deleted the openjdk6 stuff and now vuze/azureus says I need openjdk 6.

So any advice about any of this would be very helpful. Thanks in advance.

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Did you actually just manually delete it, or did you uninstall it using apt-get remove openjdk-6-jre? – Adrian Jun 27 '12 at 8:01
If the package was removed, it can simply be reinstalled (sudo apt-get update && sudo apt-get install openjdk-6-jre). If the files associated with it were manually deleted then it needs to be reinstalled (sudo apt-get update && sudo apt-get --reinstall install openjdk-6-jre). – Eliah Kagan Jun 28 '12 at 2:10

Yes, it is safe to have more than one version of Java installed. Ubuntu uses the Debian alternatives system to make this work safely and smoothly.

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