[seam-issues] [JBoss JIRA] (JBSEAM-4863) Memory Leak when calling @Destroy (with SFSBs)

[Vaclav Dedik (JIRA)]

     [ https://issues.jboss.org/browse/JBSEAM-4863?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vaclav Dedik resolved JBSEAM-4863.
----------------------------------

    Resolution: Done


Fixed.
                
> Memory Leak when calling @Destroy (with SFSBs)
> ----------------------------------------------
>
>                 Key: JBSEAM-4863
>                 URL: https://issues.jboss.org/browse/JBSEAM-4863
>             Project: Seam 2
>          Issue Type: Bug
>    Affects Versions: 2.2.2.Final
>         Environment: JBoss AS 5.1.0.GA
>            Reporter: Daniel Lechner
>            Assignee: Vaclav Dedik
>              Labels: conversation, destroy
>             Fix For: 2.3.0.Final
>
>         Attachments: JBSEAM-4863.zip
>
>   Original Estimate: 3 days
>  Remaining Estimate: 3 days
>
> In an example-project, we have 2 Seam components, one POJO and one SFSB. The POJO-component uses the SFSB-component via Seam-DI (@In). The POJO-component has a method annotated with @Destroy.
> We are using the POJO-component in a (long-running-)conversation. So the POJO-component as well as the SFSB-component will be created within the conversation.
> When the conversation ends and all components will be removed, the @Destroy-methods of all seam-components are called one after each other. The order, the @Destroy-methods are called, depend on the hashCode of the seam-name of the components (the component-names are put into an java.util.HashSet in the method org.jboss.seam.contexts.ServerConversationContext.getNamesFromSession() - the for-loop of the method org.jboss.seam.contexts.Contexts.destroy iterates through this HashSet afterwards).
> If the component-names are chosen this way, that the SFSB-component will be removed before the POJO-component is removed, a memory leak occurs:
>    1. the SFSB-component is destroyed by seam - the container removes the SFSB (the @Remove-method of the SFSB is called)
>    2. the @Destroy-method of the POJO-component is called. But before, Seam-DI creates a new SFSB-component TestEJB because of the @In-annotation
>    3. the POJO-component is removed from the conversation (and later by the GC)
>    4. the SFSB-component's @Remove-method is not called again - the container keeps the SFSB-instance
> An example-code can be found in the forum reference

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