[jboss-jira] [JBoss JIRA] (WFLY-967) ClassLoader memory leak with JSF

[Vlad Arkhipov (JIRA)]

    [ https://issues.jboss.org/browse/WFLY-967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772537#comment-12772537 ] 

Vlad Arkhipov commented on WFLY-967:
------------------------------------

The problem turns up in development mainly, but it also makes you to increase PermGen on production systems.

I see a new ModuleClassLoader in the heap dump for each deploy/undeploy of war-leak.war. There are no live paths to these class loaders, however they are collected by GC only after 30 minutes.

I think Introspector.flushCaches is not a good solution here, it's just a workaround, because it affects other deployments on the same server. In com.sun.faces.util.ReflectionUtils.clearCache it is possible to properly remove from Introspector only classes, that relates to the currently undeploying application.
                
> ClassLoader memory leak with JSF
> --------------------------------
>
>                 Key: WFLY-967
>                 URL: https://issues.jboss.org/browse/WFLY-967
>             Project: WildFly
>          Issue Type: Bug
>          Components: JSF
>            Reporter: Vlad Arkhipov
>            Assignee: Stan Silvert
>            Priority: Critical
>         Attachments: war-leak.tar.gz
>
>
> JSF application's classes are not unloaded properly when undeployed. The test case is in the attachment. Steps to reproduce:
> # mvn package
> # deploy war-leak.war
> # open http://localhost:8080/war-leak
> # undeploy war-leak.war
> # analyze a heap dump to find unloaded ModuleClassLoader of war-leak.war
> References to the WAR classes are hold by java.beans.Introspector caches. It seems to be a known bug (feature?). For example Tomcat automatically invokes java.beans.Introspector.flushCaches() when WAR undeploys. There is also IntrospectorCleanupListener in Spring for the same purpose.
> http://wiki.apache.org/commons/Logging/UndeployMemoryLeak
> http://static.springsource.org/spring/docs/2.5.x/api/org/springframework/web/util/IntrospectorCleanupListener.html

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira