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https://issues.apache.org/jira/browse/TOMAHAWK-1464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771421#action_12771421
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Hans Cappelle commented on TOMAHAWK-1464:
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See last remark at this ticket: https://issues.apache.org/jira/browse/XBEAN-95
java.beans.PropertyEditorManager keeps a strong reference to the registered
classes. The xbean PropertyEditor classes are loaded by the context class
loader, (which is the webapp class loader if running in Tomcat etc.). The class
java.beans.PropertyEditorManager is loaded by the bootstrap class loader. This
means that there is a strong reference from the bootstrap class loader to the
webapp class loader, which means that the webapp class loader cannot be
unloaded, which means that the webapp is not garbage collected when it is
undeployed.
> PermGen OutOfMemoryError caused by UploadedFile
> -----------------------------------------------
>
> Key: TOMAHAWK-1464
> URL: https://issues.apache.org/jira/browse/TOMAHAWK-1464
> Project: MyFaces Tomahawk
> Issue Type: Bug
> Components: File Upload
> Environment: myfaces-extensions-1.0.9.jar
> Sun Java System Application Server 9.1_02 (build b04-fcs)
> JDK 1.6.0_11
> Reporter: Hans Cappelle
>
> After redeploying a simple myfaces project with tomahawk extension the
> application server crashes with OutOfMemoryError: PermGen space. Using jmap
> and jhat I discovered serveral classloaders with a reference to an instances
> of org.apache.myfaces.custom.fileupload.UploadedFile were left in memory.
> Because of this classloaders can't shut down properly so after several
> redeployments we get an OutOfMemory.
> classloader hierarchy example (it states 2 classes are left because cleaning
> my test project also fails on a richfaces class):
> ^----
> org.apache.catalina.loader.webappclassloa...@0x1e26b260 [ 853 classes ]
> ^----
> com.sun.faces.application.converterpropertyeditorfactory$disposableclassloa...@0x1e27c788
> [ 2 classes ]
> One of the classes left is:
> class
> com.sun.faces.application.ConverterPropertyEditorFor_org_apache_myfaces_custom_fileupload_UploadedFile
> (84 bytes) : ??
> with a reference to:
> class org.apache.myfaces.custom.fileupload.UploadedFile (84 bytes)
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