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https://issues.apache.org/jira/browse/UIMA-437?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adam Lally closed UIMA-437.
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    Resolution: Fixed

Fixed.
Also discovered and fixed a bug that was causing CASes released by a CAS 
multiplier to still be counted against its total number of checked out CASes, 
used for error checking purposes.

> Annotators are not prevented from calling CAS.release() 
> --------------------------------------------------------
>
>                 Key: UIMA-437
>                 URL: https://issues.apache.org/jira/browse/UIMA-437
>             Project: UIMA
>          Issue Type: Bug
>          Components: Core Java Framework
>            Reporter: Adam Lally
>            Assignee: Adam Lally
>             Fix For: 2.2
>
>
> Annotators are prohibited from calling CAS.reset() but not CAS.release().
> Since release() in turn calls reset(), previously this was effectively 
> prohibited as well.  However, Marshall undid that in his recent work - making 
> release() "unlock" the CAS prohibited functions.
> This was done to allow CAS Mutipliers to release the CAS - which we currently 
> say is a best practice when an error occurs in a CAS Multiplier.
> So I think CAS Multipliers need to be allowed to call release() on CASes that 
> they obtain from the CAS pool.  But analysis components (either annotators or 
> CAS multipliers) should not be allowed to release() CASes passed to their 
> process() methods.

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