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From "Michael Pilquist (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQ-2775) Race condition in org.apache.activemq.util.osgi.Activator
Date Fri, 11 Jun 2010 18:19:52 GMT

    [ https://issues.apache.org/activemq/browse/AMQ-2775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=60029#action_60029
] 

Michael Pilquist commented on AMQ-2775:
---------------------------------------

Note that this can be worked around by ensuring the activemq-core bundle is started before
any bundles that attempt to use ActiveMQ.  In my application, this is easily accomplished
by starting AMQ at a lower start level than the bundles that use AMQ.  This isn't always possible
though, so I think it should still be fixed in AMQ.

> Race condition in org.apache.activemq.util.osgi.Activator
> ---------------------------------------------------------
>
>                 Key: AMQ-2775
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2775
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.3.2
>            Reporter: Michael Pilquist
>
> There's a race condition between start and create methods of Activator.  If a bundle
that was started before activemq-core does something that causes a call to Activator.create,
and Activator.start is still scanning bundles for contributed service files, an IOException
results.
> In practice, this occurred after upgrading from 5.3.0 to 5.3.2 because another bundle
at the same start level as activemq-core programmatically instantiated a broker from a different
thread.  The activemq-core activator was still scanning the installed bundles and hadn't gotten
to itself yet, so the result was a failure to instantiate the tcp handler.
> Making start/create/stop synchronized would fix this issue.

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