[jboss-user] [Performance Tuning] - PermGen with -server option

[iirekm]

Hello all. I have quite a trouble with JVM/JBoss:

We're developing a multimodule web application. Modified wars (=modules) are sent from continuous integration server to our development JBoss many times a day - this redeploys modified WAR. The same for clients - we'd like to redeploy single modules without restarting the server.
Unfortunately after few redeploys we get PermGen space. Server is useless and must be restarted.

1) When JVM started with -client option I can avoid PermGen space, but from time to time (~1/10 redeploys), I get this:

Cause: Class 'org.richfaces.renderkit.html.SuggestionBoxRenderer' is missing a runtime dependency: java.lang.NoClassDefFoundError: org/ajax4jsf/renderkit/compiler/ElementBase$1
  | at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:213)
  | at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:196)
  | at org.jboss.web.jsf.integration.config.JBossJSFConfigureListener.contextInitialized(JBossJSFConfigureListener.java:69)
  | 

I need to restart redeploy. After few redeploys this error repeats.
A bug in JVM or JBoss, or do I need to add some magical command line options for JVM?

2) With -server option I still have PermGen space, because JVM doesn't call finalize() methods on objects. Finalization queue is big.
Is there any JVM option for enabling finalization in -server mode (except manual calling System.runFinalization()), or this is a bug in JVM?

3) According to -XX:+TraceClassUnloading, JVM unloads unused classes only when PermGen memory is full. Lots of unused classes from WEB-INF/lib are kept in memory for long time. Couldn't this unloading be done earlier?

Any ideas? My JVM version is 1.6.0_10, JBoss 4.2.2.GA. 

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