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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 Tue, 18 Dec 2012 07:14:14 GMT

    [ https://issues.apache.org/jira/browse/OGNL-228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13534719#comment-13534719
] 

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

There are 16384 methods and no two methods apparently have the same name. Each method belongs
to none enhanced classes, and they are struts actions and POJOs holding parameter values.
Each DelegatingClassLoader has retained size of 2,192 bytes and for those 16384 methods, that
is roughly 36MB of memory consumption.
                
> 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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