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From "haruhiko nishi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OGNL-228) Is ognl.OgnlRuntime some root cause of PermGen OutOfMemoryError problem?
Date Mon, 17 Dec 2012 09:56:15 GMT

    [ https://issues.apache.org/jira/browse/OGNL-228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13533813#comment-13533813
] 

haruhiko nishi commented on OGNL-228:
-------------------------------------

The only problem is the DelegatingClassLoaders keep generated and are held in the ognl.OgnlRuntime.
The ognl seems to be working fine with the javaassist.jar that is a server scoped library.
                
> Is ognl.OgnlRuntime some root cause of PermGen OutOfMemoryError problem?
> ------------------------------------------------------------------------
>
>                 Key: OGNL-228
>                 URL: https://issues.apache.org/jira/browse/OGNL-228
>             Project: Commons OGNL
>          Issue Type: Bug
>         Environment: RHEL 6 x64
>            Reporter: haruhiko nishi
>            Priority: Critical
>              Labels: OutOfMemoryError
>
> While analyzing several heap dumps using Yourkit, we have observed many instances of
DelegatingClassLoader, or more precisely sun.reflect.GeneratedMethodAccessorXXX, where XXX
represents some sequential numbers, were created through the usage of Java reflection by the
frameworks implemented in our web application.
> GeneratedMethodAccessorXXX is allegedly used for some sort of reflection optimization
mechanism according to the url at http://www-01.ibm.com/support/docview.wss?uid=swg21566549.
> Because this is what seems to be eating up our memory allocated for PermGen, as the number
of the DelegatingClassLoader is gradually increased and JVM crushes with OutOfMemoryError,
we scrutinized what is possibly blocking these DelegatingClassLoaders from being garbage collected
and found many of them are relevant to _methodParameterTypesCache of ognl.OgnlRuntime.
> Is there any known problems regarding this issue?

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