Tomcat on production server, PermGen and redeploys

user_221951 0
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It looks like 

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

is a common problem. You can Increase the size of your perm space, but after 100 or 200 redeploys it will be full. Tracking ClassLoader memory leaks is nearly impossible.

What are your methods for Tomcat (or another simple servlet container - Jetty?) on production server? Is server restart after each deploy a solution?

Do you use one Tomcat for many applications ?

Maybe I should use many Jetty servers on different ports (or an embedded Jetty) and do undeploy/restart/deploy each time ?

redeploy out-of-memory permgen tomcat java
7 Answers

You should enable PermGen garbage collection. By default Hotspot VM does NOT collect PermGen garbage, which means all loaded class files remain in memory forever. Every new deployment loads a new set of class files which means you eventually run out of PermGen space.

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