[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-3999) Race condition in component initialization

Wed Mar 11 14:38:40 EDT 2009

    [ https://jira.jboss.org/jira/browse/JBSEAM-3999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12456762#action_12456762 ] 

Norman Richards commented on JBSEAM-3999:
-----------------------------------------

I've verified the race condition.  Although we've known that components are registered before they are completely initialized, I didn't realize there was potential for duplicate instances to be created.  Since these are application-scoped components, I think we can justify some sort of synchronization around new instance creation.   Since conversations are already serialized, this shouldn't be a big issue for other scopes.  

> Race condition in component initialization
> ------------------------------------------
>
>                 Key: JBSEAM-3999
>                 URL: https://jira.jboss.org/jira/browse/JBSEAM-3999
>             Project: Seam
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.1.1.GA
>            Reporter: Stuart Douglas
>            Assignee: Norman Richards
>
> When starting up application (or session) scoped component that do not have an @Startup annotation it is possible to get a race condition where two instances of the component are instantiated, as no locking is present in component initialization. I ran into this when my multi-threaded reporting process was the first component to hit the cache and jboss cache provider got instantiated twice:
> `16:54:48,717 INFO  [JbossCacheProvider] Starting JBoss Treecache 1.x
> 16:54:48,717 INFO  [JbossCacheProvider] Starting JBoss Treecache 1.x`
> In this case it is easy to work around, by simply adding startup="true" to the application scoped component. It is also possible to make calls on a component before the create method is called.

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