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https://issues.apache.org/jira/browse/IBATIS-540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636636#action_12636636
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Kai Grabfelder commented on IBATIS-540:
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cool, then I guess it is save to apply it ;-). @Devs? What do you think?
> Classloader memory leak because of ThreadLocal in ResultObjectFactoryUtil
> -------------------------------------------------------------------------
>
> Key: IBATIS-540
> URL: https://issues.apache.org/jira/browse/IBATIS-540
> Project: iBatis for Java
> Issue Type: Bug
> Components: SQL Maps
> Affects Versions: 2.3.3, 2.3.4
> Reporter: Sylvain Laurent
> Attachments: ibatis patch for classloader memleak.txt
>
>
> I'm using iBatis in a webapp with Spring and facing memory leaks upon
> redeployment oft he webapp.
> I tracked the leaks to ibatis, where the class ResultObjectFactoryUtil has a
> static ThreadLocal factorySettings
> The problem is that the value bound to a Thread through this ThreadLocal is
> never nullified, and since the "factorySettings" is a static variable, the
> ThreadLocal instance is reachable as long as the ClassLoader of the webapp is
> reachable. But since the FactorySettings instance is bound to the Thread
> through a strong reference (see the JDK implementation of ThreadLocal in
> ThreadLocalMap$Entry), the classloader is finally never collected...
> The solution is to always cleanup the ThreadLocal after usage (in
> SqlExecurtor)
> I attach a patch for iBatis 2.3.4 to this issue
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