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https://issues.apache.org/jira/browse/WW-5537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lukasz Lenart updated WW-5537:
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Fix Version/s: 6.8.0
> Memory Leak
> ------------
>
> Key: WW-5537
> URL: https://issues.apache.org/jira/browse/WW-5537
> Project: Struts 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 6.7.0
> Environment: JDK 17
> Tomcat 9
> Reporter: Andrea Vettori
> Priority: Major
> Fix For: 6.8.0
>
>
> Struts is leaking memory when a WAR is hot deployed in Tomcat: for each hot
> deploy some classes remain in memory instead of being garbage collected. For
> big applications this causes OOM memory exceptions very quickly for Meatspace
> exhaustion because the entire class loader of the app is not released.
> For testing the HelloWorld app from struts-examples can be used. Deploy the
> war in tomcat as the only web app in the server. For each "reload" (from
> Tomcat manager) or simply copying the war file over the deployed one, taking
> a memory dump (with jmap) and looking at the content with a memory profiler
> (such as Eclipse MAT) shows that there is one ApplicationContext class for
> each hot deploy instead of just one.
>
> The problem is present in version 6.7.4-SNAPSHOT of Feb 28th.
>
> If the server can be restarted at each deploy the problem is obviously not a
> real problem. However if a tomcat instance contains more than one application
> being able to hot deploy a single one is very useful as it does not force all
> apps down for the server restart.
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