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https://issues.apache.org/jira/browse/UIMA-2708?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jim Challenger resolved UIMA-2708.
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    Resolution: Fixed
    
> DUCC Service Manager - intermittent crash on startup loading service 
> registrations.
> -----------------------------------------------------------------------------------
>
>                 Key: UIMA-2708
>                 URL: https://issues.apache.org/jira/browse/UIMA-2708
>             Project: UIMA
>          Issue Type: Bug
>          Components: DUCC
>            Reporter: Jim Challenger
>            Assignee: Jim Challenger
>
> During SM init, as well as during registration, SM does a topological sort to 
> detect and reject circular references.  The code needs to account for 
> independent services which might be implicit, or submitted in the future 
> (i.e. references to currently unregistered services) and ignore them in the 
> topo sort.  This is ok because if they're not registered, they're not in a 
> cycle.  If they are registered later, the topo sort will occur as part of 
> registration and they'll then be included, so all is well.

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