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From "Andrus Adamchik (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CAY-1668) Memory Exhaustion Problem with Deserialization of ObjectContext
Date Mon, 05 Mar 2012 19:05:58 GMT

    [ https://issues.apache.org/jira/browse/CAY-1668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222515#comment-13222515
] 

Andrus Adamchik commented on CAY-1668:
--------------------------------------

This is good news. Then we can simply flip the dependency version in Cayenne POM
                
> Memory Exhaustion Problem with Deserialization of ObjectContext
> ---------------------------------------------------------------
>
>                 Key: CAY-1668
>                 URL: https://issues.apache.org/jira/browse/CAY-1668
>             Project: Cayenne
>          Issue Type: Bug
>          Components: Core Library
>    Affects Versions: 3.0.2
>         Environment: MacOS-X 10.7, Java 1.6.0_29, Simple Web Application run in the Maven
plugin "jetty-maven-plugin"
>            Reporter: Andrew Lindesay
>
> I am running a simple web application launched from maven using "jetty-maven-plugin".
 The simple web application has a Filter which does this;
> 1) Copies the HttpSession's attributes to a Map
> 2) Serializes the Map
> 3) Deserializes the Map
> 4) Copies the entries of the Map back into HttpSession
> In each case, the ClassLoader should be the same (no stranded singletons etc...) and
there is no "hot deploy" happening.  The purpose of this undertaking is to ensure that the
application is able to handle serialized sessions.  In doing this experiment, I have observed
a memory exhaustion issue around serializing and de-serializing ObjectContext.  If I explicitly
stop serializing "ObjectContext" then the problem stops.
> Using jprofiler, I have observed that the memory consumption increases roughly exponentially
in relation to the number of serialization/de-serialization events.  Also from jquery analysis
I see the memory is being referenced from;
>     org.apache.commons.collections.map.AbstractHashedMap$HashEntry[]
>     > org.apache.commons.collecitons.map.LRUMap
>     >> org.apache.cayenne.access.jdbc.SQLTemplateResourceManager
>     >>> ...velocity
> The problem manifests itself quite quickly; a few dozen serialize + de-serialize phases.

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