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https://issues.apache.org/jira/browse/BEAM-12578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17478276#comment-17478276
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Kenneth Knowles commented on BEAM-12578:
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You are certainly right. Here it is:
https://github.com/apache/beam/blob/6390bcd265512f077c92124a551419ee0349c84c/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/reflect/DoFnSignatures.java#L199
Notably, you don't need it. I actually don't know why it exists, and don't
think it should. We trying to move away from "Context" parameters (which are
not contexts at all but just collections of parameters in a
hard-to-debug/analyze object). The context gives you access to the window,
which you can do with the {{@Window}} parameter.
> Illegal parameter type: OnWindowExpirationContextParameter
> ----------------------------------------------------------
>
> Key: BEAM-12578
> URL: https://issues.apache.org/jira/browse/BEAM-12578
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Affects Versions: 2.29.0
> Reporter: Stefan Wachter
> Priority: P3
>
> {{OnWindowsExpirationContext}} can not be used as a parameter for {{DoFn}}
> methods annotated by {{@OnWindowExpiration}}. The following exception is
> raised:
> {code:java}
> java.lang.IllegalArgumentException:
> org.opennms.nephron.cortex.PaneAccumulator$PaneCombinerFn: Illegal parameter
> type: OnWindowExpirationContextParameter{}{code}
> As a workaround a parameter of type {{OutputReceiver}} can be used, though.
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