[jira] [Commented] (BEAM-2304) State declared with one class cannot be accessed as a superclass (applies to BagState|CombiningState <: GroupingState)

["Kenneth Knowles (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-2304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16012854#comment-16012854 ] 

Kenneth Knowles commented on BEAM-2304:
---------------------------------------

I agree with this. I'm going to unassign as I think this is the sort of thing that there are some other contributors who might pick up before I get to it.

> State declared with one class cannot be accessed as a superclass (applies to BagState|CombiningState <: GroupingState)
> ----------------------------------------------------------------------------------------------------------------------
>
>                 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:
> {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) {
> }
> {code}
> Fails with: 
> {code}
> parameter of type GroupingState<Integer, Integer> at index 1: reference to StateId exists with different type CombiningState<Integer, int[], Integer>
> {code}
> 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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