[jboss-jira] [JBoss JIRA] Updated: (JBAS-5270) ClassLoader not unloaded on undeploy

Mon Mar 3 08:27:57 EST 2008

     [ http://jira.jboss.com/jira/browse/JBAS-5270?page=all ]

Arto Huusko updated JBAS-5270:
------------------------------

    Attachment: simpleejb.ear

The simple EAR file used to produce the issue.

> ClassLoader not unloaded on undeploy
> ------------------------------------
>
>                 Key: JBAS-5270
>                 URL: http://jira.jboss.com/jira/browse/JBAS-5270
>             Project: JBoss Application Server
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: ClassLoading
>    Affects Versions: JBossAS-4.2.1.GA
>         Environment: JDK 1.6.0_04 amd64
>            Reporter: Arto Huusko
>         Assigned To: Scott M Stark
>         Attachments: simpleejb.ear
>
>
> When an EAR is undeployed, its ClassLoader and classes loaded by it are not unloaded, which leads to out of memory error in permanent generation on redeploy.
> It appears that the ClassLoader becomes an orphaned ClassLoader (see http://blogs.sun.com/edwardchou/entry/find_orphaned_classloaders), and apparently JVM is unable to GC such ClassLoader instances (if it were, I don't understand the point of the blog about orphaned loaders).
> My simple test ear contains one stateless session EJB (2.1), with a simple "echo" method (takes string, returns string). Jhat shows that the only reference to the ClassLoader instance comes from static field m3 in class $ProxyNN, where $ProxyNN is loaded by the same ClassLoader (in case it makes any difference, m3 points to the create method of the local home interface of the session).

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