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https://issues.apache.org/jira/browse/FLINK-9299?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stephan Ewen closed FLINK-9299.
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> ProcessWindowFunction documentation Java examples have errors
> -------------------------------------------------------------
>
>                 Key: FLINK-9299
>                 URL: https://issues.apache.org/jira/browse/FLINK-9299
>             Project: Flink
>          Issue Type: Bug
>          Components: Documentation
>    Affects Versions: 1.4.2
>            Reporter: Ken Krugler
>            Assignee: vinoyang
>            Priority: Minor
>             Fix For: 1.5.0
>
>
> In looking at 
> [https://ci.apache.org/projects/flink/flink-docs-release-1.4/dev/stream/operators/windows.html#processwindowfunction-with-incremental-aggregation],
>  I noticed a few errors...
>  * "This allows to incrementally compute windows" should be "This allows it 
> to incrementally compute windows"
>  * DataStream<Tuple2<String, Long> input = ...; should be 
> DataStream<Tuple2<String, Long>> input = ...;
>  * The getResult() method needs to cast one of the accumulator values to a 
> double, if that's what it is going to return.
>  * MyProcessWindowFunction needs to extend, not implement 
> ProcessWindowFunction
>  * MyProcessWindowFunction needs to implement a process() method, not an 
> apply() method.
>  * The call to .timeWindow takes a Time parameter, not a window assigner.
>  



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