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https://issues.apache.org/jira/browse/OGNL-228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13534506#comment-13534506
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haruhiko nishi edited comment on OGNL-228 at 12/18/12 2:13 AM:
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In the _methodParameterTypesCaches HashMap retained in the ognl.OgnlRuntime,
there are 16384 HashMap$Entry entries and that does not seem to be all of the
methods belonging to the classes we have in this application. Each method has
its corresponding DelegatingClassLoader generated which seems to be what is
causing the PermGen OutOfMemoryError. Is there a way to disable this feature?
was (Author: hanishi):
In the _methodParameterTypesCaches HashMap retained in the
ognl.OgnlRuntime, there are 1638 HashMap$Entry entries and that does not seem
to be all of the methods belonging to the classes we have in this application.
Each method has its corresponding DelegatingClassLoader generated which seems
to be what is causing the PermGen OutOfMemoryError. Is there a way to disable
this feature?
> 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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