[jboss-jira] [JBoss JIRA] (WFLY-12643) Memory leak in FlashScope - expired elements are not cleared

[Ivo Studensky (Jira)]

     [ https://issues.jboss.org/browse/WFLY-12643?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ivo Studensky updated WFLY-12643:
---------------------------------
    Labels: downstream_dependency  (was: )


> Memory leak in FlashScope - expired elements are not cleared
> ------------------------------------------------------------
>
>                 Key: WFLY-12643
>                 URL: https://issues.jboss.org/browse/WFLY-12643
>             Project: WildFly
>          Issue Type: Bug
>          Components: JSF
>         Environment: * JBoss EAP 7.2.3 (also JBoss EAP 7.1.6 that is the latest version in 7.1.x is affected by this issue)
>            Reporter: Bartosz Spyrko
>            Assignee: Bartosz Spyrko
>            Priority: Critical
>              Labels: downstream_dependency
>
> Objects in FlashScope is not cleared and keep accumulating even if POST-REDIRECT-BACK is completed.
> If we put a huge object to FlashScope continuously as the following code, Java heap space will be exhausted soon.
> {code:java}
> @Model
> public class Action {
>     private static final int oneHundredMB = 1024 * 1024 * 100;
>     public String next() {
>         Flash flash = FacesContext.getCurrentInstance().getExternalContext().getFlash();
>         flash.putNow("huge", new byte[oneHundredMB]);
>         return "index.xhtml?faces-redirect=true";
>     }
> }
> {code}
> When OutOfMemoryError is happened, flashInnerMap field in com.sun.faces.context.flash.ELFlash is bloated.
> {noformat}
> Class Name                                                             | Ref. Objects | Shallow Heap | Ref. Shallow Heap | Retained Heap
> -----------------------------------------------------------------------------------------------------------------------------------------
> java.lang.Thread @ 0xeea24380  default task-1 Thread                   |            1 |          120 |                64 |        20,800
> '- <Java Local> com.sun.faces.context.flash.ELFlash @ 0xee9e4608       |            1 |           40 |                64 |            64
>    '- flashInnerMap java.util.concurrent.ConcurrentHashMap @ 0xee9e4630|            1 |           64 |                64 |   314,574,048
> -----------------------------------------------------------------------------------------------------------------------------------------
> {noformat}



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