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https://issues.apache.org/jira/browse/EL-1?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15520962#comment-15520962
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Jarek Jarcec Cecho commented on EL-1:
-------------------------------------
Thanks for the follow up [~britter], appreciated! I'll certainly take a look
into using Tomcat EL instead.
> [el] Memory Leak: EL Cache entries never removed.
> -------------------------------------------------
>
> Key: EL-1
> URL: https://issues.apache.org/jira/browse/EL-1
> Project: Commons EL
> Issue Type: Bug
> Affects Versions: 1.0
> Environment: Operating System: All
> Platform: All
> Reporter: Bill Alexander
>
> This bug refers to the two caches on ExpressionEvaluatorImpl,
> sCachedExpressionStrings, but primarily sCachedExpectedTypes.
> Here is a use case to illustrate the problem. A web application typically
> creates 1,000 different objects of classes it defines using the EL language,
> and
> PropertyEditor's. A Tomcat instance is run with 5 of these web applications.
> Each time one of them is reloaded, a new classloader is created for the web
> application, so a new set of 1,000 objects is created in the cache. The old
> objects, and objects they point to (e.g. class and classloader objects), are
> never garbage collected. The only way to recover the associated memory is to
> stop and restart Tomcat.
> There are many possible solutions. A simple one would be to age instances out
> of the caches after a fixed period of time (say one hour). It would be nice if
> whatever cache controls are provided are configurable.
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