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https://issues.apache.org/jira/browse/OGNL-228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13535481#comment-13535481
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haruhiko nishi commented on OGNL-228:
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Jochen: I think any webapp with huge amount of action will reproduce the
"problem." (It can be a problem, if one does not think enough of the memory
consumption by the DelegatingClassLoader)
The problem is enormous number of actions and related parameter objects each of
whose method gets retained in the HashMap of ognl.OgnlRuntime in the form of
java.lang.reflect.Method. I wonder how much of PermGen space is used for each
corresponding sun.reflect.GeneratedMethodAccessorXXX loaded by its dedicated
DelegatingClassLoader when it turns from NativeMethodAccessorImpl. Do you have
any idea?
> 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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