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https://issues.apache.org/jira/browse/OGNL-228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13530652#comment-13530652
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haruhiko nishi edited comment on OGNL-228 at 12/13/12 3:56 AM:
---------------------------------------------------------------
Here is how the path to DelegatingClassLoaders looks like:
sun.reflect.DelegatingClassLoader
|_<loader> of sun.reflect.GeneratedMethodAccessor14121
|_<class> of sun.reflect.GeneratedMethodAccessor14121
|_delegate of sun.reflect.DelegationMethodAccessorImpl
|_methodAccessor of java.lang.reflect.Method
|_key of java.util.HashMap$Entry
|_[49269] of java.util.HashMap$Entry[16384]
|_table of java.util.HashMap
|_ _methodParameterTypesCache of ognl.Runtime
|_[7690] of java.util.Object[20480]
|_ elementData of java.util.Vector
|_classes of
org.jboss.classloader.spi.base.BaseClassLoader[Stack Local]
|_<local variable> of java.lang.Thread[Stack
local, Thread] "ajp-xxx.xxx.xxx.xxx-8009-3"
was (Author: hanishi):
Here is how the path to DelegatingClassLoaders looks like:
{code}
sun.reflect.DelegatingClassLoader
|_<loader> of sun.reflect.GeneratedMethodAccessor14121
|_<class> of sun.reflect.GeneratedMethodAccessor14121
|_delegate of sun.reflect.DelegationMethodAccessorImpl
|_methodAccessor of java.lang.reflect.Method
|_key of java.util.HashMap$Entry
|_[49269] of java.util.HashMap$Entry[16384]
|_table of java.util.HashMap
|_ _methodParameterTypesCache of ognl.Runtime
|_[7690] of java.util.Object[20480]
|_ elementData of java.util.Vector
|_classes of
org.jboss.classloader.spi.base.BaseClassLoader[Stack Local]
|_<local variable> of java.lang.Thread[Stack
local, Thread] "ajp-xxx.xxx.xxx.xxx-8009-3"
{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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