[Hibernate-issues] [Hibernate-JIRA] Commented: (HHH-1236) Remove static reference to classloader, to avoid memory leak at webapp reload

[G (JIRA) <no...@at...>]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1236?page=comments#action_23382 ] 

G commented on HHH-1236:
------------------------

Because, to quote the Bug description at the top of the page:

"To avoid memory leaks when web applications reload, please either remove reference to classloader in org.hibernate.util.DTDEntityResolver or remove static reference to that class in org.hibernate.util.XMLHelper "

I however know enough about Java to know that using a static ClassLoader is a recipe for memory leaks. 

"ClassLoaders
The use of the Java ClassLoader construct is riddled with chances for memory leaks. What makes ClassLoaders so difficult from a memory-leak perspective is the complicated nature of the construct. ClassLoaders are different in that they are not just involved with "normal" object references, but are also meta-object references such as fields, methods, and classes. This means that as long as there are references to fields, methods, classes, or objects of a ClassLoader, the ClassLoader will stay in the JVM. Since the ClassLoader itself can hold on to a lot of classes as well as all their static fields, quite a bit of memory can be leaked. "


Please refer to this link for more information on the subject.
http://dev2dev.bea.com/pub/a/2005/06/memory_leaks.html

But if you have no intention of fixing this memory leak, can you, at least,  remove it from the resolved issues. I think there are a few people under the mistaken impression that this has been resolved.


> Remove static reference to classloader, to avoid memory leak at webapp reload
> -----------------------------------------------------------------------------
>
>          Key: HHH-1236
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1236
>      Project: Hibernate3
>         Type: Bug

>   Components: core
>     Versions: 3.0.5
>  Environment: Resin 3.0.15, CGLib 2.1_3
>     Reporter: Mattias Jiderhamn
>     Assignee: Steve Ebersole
>      Fix For: 3.2.0.alpha1, 3.1.3
>  Attachments: OptimizeIt.jpg
>
>
> To avoid memory leaks when web applications reload, please either remove reference to classloader in org.hibernate.util.DTDEntityResolver or remove static reference to that class in org.hibernate.util.XMLHelper
> For background information, please see
> http://forum.hibernate.org/viewtopic.php?p=2275217#2275217
> http://opensource2.atlassian.com/confluence/spring/pages/viewpage.action?pageId=2669
> and attached screen shot

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