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https://issues.apache.org/jira/browse/CXF-2156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marc Schaaf updated CXF-2156:
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    Attachment: Activator_ListenerHook_Bug.patch

This seems to solve the issue by placing the registration of the hook in a 
different thread

> dOSGi startup blocks in some cases when other bundles already wait for remote 
> services
> --------------------------------------------------------------------------------------
>
>                 Key: CXF-2156
>                 URL: https://issues.apache.org/jira/browse/CXF-2156
>             Project: CXF
>          Issue Type: Bug
>          Components: Distributed-OSGi
>            Reporter: Marc Schaaf
>            Priority: Minor
>         Attachments: Activator_ListenerHook_Bug.patch
>
>
> When the distributed OSGi bundle is deployed in an OSGi container where 
> already one or more bundles are waiting for remote services, the start-up 
> blocks until the remote calls of the other bundles are finished if the other 
> bundles does these calls inside the callback method of the ServiceTracker. 
> This happens because the registration of the service hook by the distributed 
> OSGi bundle blocks in the mentioned case. 
> It looks like the hook is instantly informed about already existing service 
> listeners. The hook than registers the the proxy services which causes the 
> execution of the service listeners of the other bundles. The other bundles 
> than make their remote calls from within the addingService method of the 
> ServiceTracker. All of this seems to happen in the start-up Thread which 
> causes the start-up of the distributed OSGi bundle to block until the remote 
> calls are finished. 
> Placing the registration of the hook in a different thread seems to solve the 
> issue. 

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