[jira] [Work logged] (WW-5537) Memory Leak

[ASF GitHub Bot (Jira)]

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https://issues.apache.org/jira/browse/WW-5537?focusedWorklogId=1010996&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-1010996
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ASF GitHub Bot logged work on WW-5537:
--------------------------------------

                Author: ASF GitHub Bot
            Created on: 23/Mar/26 17:44
            Start Date: 23/Mar/26 17:44
    Worklog Time Spent: 10m 
      Work Description: sonarqubecloud[bot] commented on PR #1632:
URL: https://github.com/apache/struts/pull/1632#issuecomment-4112538481

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 1010996)
    Time Spent: 50m  (was: 40m)

> 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
>            Assignee: Lukasz Lenart
>            Priority: Major
>             Fix For: 6.9.0, 7.2.0
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> 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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