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https://issues.apache.org/jira/browse/UIMA-1712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12794950#action_12794950
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Marshall Schor commented on UIMA-1712:
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This seems somewhat likely to occur in normal use. Because of this, and
because it seems like a very small fix, I'm leaning to doing a new release
candidate for this.
> Finalize typesystem only when top level aggregate is ready
> ----------------------------------------------------------
>
> Key: UIMA-1712
> URL: https://issues.apache.org/jira/browse/UIMA-1712
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout
> Reporter: Eddie Epstein
> Assignee: Eddie Epstein
>
> a UIMA AS service will finalize its typesystem incorrectly if
> 1. it is an AS-async-aggregate containing a colocated delegate which is
> itself an async aggregate, AND
> 2. the colocated async aggregate finishes initialization before one of the
> other top level delegates, AND
> 3. the late top level delegate has new types or new type priorities.
> This can result in initialization errors if a type priority or AE
> initialization method references a missing
> type or feature, or an exception later in process() doing the same.
> The bug is caused because the typesystem is finalized when *any* colocated
> async aggregate finishes
> initialization.
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