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https://issues.apache.org/jira/browse/OGNL-228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13533818#comment-13533818
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Lukasz Lenart commented on OGNL-228:
------------------------------------
But why each time it generates a new class loader ? Is it related to Hibernate
and proxy which is generated for each entity ? And when such method / getter is
access via Ognl, a new entry is added to _methodParameterTypesCache
{code:java}
public static Class[] getParameterTypes(Method m)
{
synchronized (_methodParameterTypesCache)
{
Class[] result;
if ((result = (Class[]) _methodParameterTypesCache.get(m)) == null)
{
_methodParameterTypesCache.put(m, result =
m.getParameterTypes());
}
return result;
}
}
{code}
> 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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