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https://issues.apache.org/jira/browse/UIMA-4669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17196423#comment-17196423
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Richard Eckart de Castilho commented on UIMA-4669:
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[~schor] what is the status of this issue?
> UV3 Internal - change some APIs to return more specific subclass
> ----------------------------------------------------------------
>
> Key: UIMA-4669
> URL: https://issues.apache.org/jira/browse/UIMA-4669
> Project: UIMA
> Issue Type: Improvement
> Components: Core Java Framework
> Reporter: Marshall Schor
> Priority: Minor
>
> A method which always returns an instance of class C can be specified in the
> API to return an instance of C or any of its superclasses. Change the return
> type to be C instead of one of the superclasses, because
> - the user who is expecting the supertype will still work and cost nothing
> (a "Widening Reference Conversion")
> - users who need the subtype would otherwise need to cast back to the
> subtype - which is a runtime check (unless the JIT can optimize this away).
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