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https://issues.apache.org/jira/browse/BEAM-2304?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kenneth Knowles updated BEAM-2304:
----------------------------------
    Labels: starter  (was: )

> State API cannot recognize State superclases
> --------------------------------------------
>
>                 Key: BEAM-2304
>                 URL: https://issues.apache.org/jira/browse/BEAM-2304
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-core
>            Reporter: Reuven Lax
>            Assignee: Kenneth Knowles
>              Labels: starter
>
> The following code:
> @StateId("foo")
>             private final StateSpec<CombiningState<Integer, int[], Integer>> 
> state =
>                 StateSpecs.combining(Sum.ofIntegers());
>             @ProcessElement
>             public void processElement(ProcessContext c,
>                                        @StateId("foo") GroupingState<Integer, 
> Integer> state) {
> }
> Fails with: 
> parameter of type GroupingState<Integer, Integer> at index 1: reference to 
> StateId exists with different type CombiningState<Integer, int[], Integer>
> However since GroupingState<Integer, Integer> is the base class, ideally this 
> should work - and would make the API easier to use if it did.



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