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The title pretty much says it all:

I would like to perform an apt-get upgrade on my server to get the latest JRE (among other packages), but there are a couple of JVMs running which should not be stopped. Is it safe to do the upgrade?

Ubuntu 12.04
OpenJDK 7 JRE

1 Answers1

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The currently running JVM are not affected by the upgrade process.

For example: Tomcat daemon didn't get restarted, neither did manually executed programs (java -jar myproject.jar).

Consequently, I guess those processes are still using the old verions; but they will use them the next time they get restarted.