Tomcat on production server, PermGen and redeploys

Question

It looks like

 MemoryError: PermGen space
 java.lang.OutOfMemoryError: PermGen space

is a common problem. You can Increase the size of your pe

Answer 1

PermGen switches in HotSpot only delay the problem, and eventually you will get the OutOfMemoryError anyway.

We have had this problem a long time, and the only solution I've found so far is to use JRockit instead. It doesn't have a PermGen, so the problem just disappears. We are evaluating it on our test servers now, and we haven't had one PermGen issue since the switch. I also tried redeploying more than 20 times on my local machine with an app that gets this error on first redeploy, and everything chugged along beautifully.

JRockit is meant to be integrated into OpenJDK, so maybe this problem will go away for stock Java too in the future.

http://www.oracle.com/technetwork/middleware/jrockit/overview/index.html

And it's free, under the same license as HotSpot:

https://blogs.oracle.com/henrik/entry/jrockit_is_now_free_and