[jboss-jira] [JBoss JIRA] (WFLY-9849) Hibernate session related leak on module undeployment

[Scott Marlow (JIRA)]

     [ https://issues.jboss.org/browse/WFLY-9849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Scott Marlow closed WFLY-9849.
------------------------------
    Resolution: Rejected


There is no memory leak, just a weak reference that stays around after undeployment.  The weak references should be cleaned up by the Java garbage collector.

> Hibernate session related leak on module undeployment
> -----------------------------------------------------
>
>                 Key: WFLY-9849
>                 URL: https://issues.jboss.org/browse/WFLY-9849
>             Project: WildFly
>          Issue Type: Bug
>    Affects Versions: 11.0.0.Final, 12.0.0.Final
>         Environment: * Ubuntu 16.04.3 LTS
> * OpenJDK 1.8.0_151
> * Wildfly 11.0.0.Final
> Seems to occur at least on CentOS 7/OpenJDK 1.8.0_151 also.
>            Reporter: Joni Syri
>            Assignee: Scott Marlow
>
> In some cases it seems that removing deployment from the Wildfly, doesn't free up {{org.hibernate.internal.SessionFactoryImpl}}- instance related to the deployment. (plus some other Hibernate related classes). This can be seen by taking memory dump with VisualVM and looking up {{SessionFactoryImpl}} instances. 
> This leads to cumulative memory leak in cases, where application is repeatedly deployed/undeployed (or updated).
> updated: Seems to occur on 12.0.0.Final also
> Memory dumps can be found at https://drive.google.com/drive/folders/1WbHB6hRpr_lrc4yb4yxWLpeObmJlNCzD (wildfly-leak-1 is after first deployment, wildfly-leak-2 after few re-deploys)
> server.log https://drive.google.com/file/d/1I32OTnPWeopVEtRC3ol-pjkH2dlkLizD/view?usp=sharing



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