[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-2082) JMS Topic subscriptions never released

Tue Aug 4 03:09:29 EDT 2009

    [ https://jira.jboss.org/jira/browse/JBSEAM-2082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12478723#action_12478723 ] 

Shane Bryzak commented on JBSEAM-2082:
--------------------------------------

Just an update - the workaround looks acceptable, although as mentioned it would be nice to avoid using MockHttpServletRequest - I'm sure we can lookup the SubscriptionRegistry directly from the session (by wrapping it in a Context).  

This still needs to be tested with a real example, although I'm bogged down with TCK work right now.  Norman if you have a chance could you please try this patch out with the chatroom example.  If it all looks ok, then the patch can be directly applied to SeamListener.  We will also need to apply it to the Seam 3.x remoting module.

> JMS Topic subscriptions never released
> --------------------------------------
>
>                 Key: JBSEAM-2082
>                 URL: https://jira.jboss.org/jira/browse/JBSEAM-2082
>             Project: Seam
>          Issue Type: Bug
>          Components: Remoting
>    Affects Versions: 1.2.0.GA, 1.2.1.GA, 2.0.0.CR1, 2.0.0.CR2, 2.0.0.CR3, 2.0.2.SP1
>         Environment: JBossAS 4.2.3.GA, All platforms. 
>            Reporter: Scott McNab
>            Assignee: Norman Richards
>             Fix For: 2.2.1.CR1
>
>
> In the current Seam remoting implementation, there is no mechanism to clean up and release JMS topic subscriptions for clients that may have subscribed to a JMS topic, but who do not explicitly unsubscribe()  (e.g. due to a coding error or if the client simply disappears)
> Unless a web-client specifically calls Seam.Remoting.unsubscribe(), the RemoteSubscriber object is never released, and the corresponding TopicSession and TopicSubscriber resources will be held open indefinitely. This will cause the JMS provider to store an ever-growing list of undelivered topic messages, which will eventually result in an out of memory crash.
> Seam Remoting needs to be able to correctly identify situations whereby a RemoteSubscriber is no longer in use, and release resources accordingly.
> One possible solution might be to periodically check all subscriptions in the SubscriptionRegistry and release any which have not had a recent poll request beyond a certain time limit.

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