[seam-issues] [JBoss JIRA] Commented: (JBSEAM-4576) Upgrade Javassist to new version - current version has memory leaks

Fri Oct 22 07:58:55 EDT 2010

    [ https://jira.jboss.org/browse/JBSEAM-4576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12558734#action_12558734 ] 

Marek Novotny commented on JBSEAM-4576:
---------------------------------------

I have looked at javassist project and Marko Struberg's patches was applied in https://jira.jboss.org/browse/JASSIST-42. Anyway I will grab the latest version of javassist for upgrade - 3.12.0.GA 

> Upgrade Javassist to new version - current version has memory leaks
> -------------------------------------------------------------------
>
>                 Key: JBSEAM-4576
>                 URL: https://jira.jboss.org/browse/JBSEAM-4576
>             Project: Seam
>          Issue Type: Task
>          Components: Core
>    Affects Versions: 2.2.0.CR1, 2.2.0.GA
>            Reporter: Marek Novotny
>            Assignee: Marek Novotny
>             Fix For: 2.2.1.CR3
>
>
> The problem is caused by the current javassist usage pattern of calling ProxyFactory.createClass().newInstance() which currently (due to the broken cache), always creates a new class for the proxy. And once this class gets classloaded, you cannot easily get rid of it from the ClassLoaders class map.
> There were also a few problems with deserialization, mainly because it did drop the assigned MethodHandler and used the DefaultMethodHandler instead.
> Storing a static reference cause a problem for garbage collection, because the MethodHandler set directly into the ProxyFactory can never get freed.
> Patches from Mark Struberg are available at http://github.com/struberg/javassist

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