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https://issues.apache.org/jira/browse/FLINK-3138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15048430#comment-15048430
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Stephan Ewen commented on FLINK-3138:
-------------------------------------
Try using a custom type with a getKey method(). Then the referenced method is
non-static and parameterless (the one parameter is then implicitly {{this}}).
> Method References are not supported as lambda expressions
> ---------------------------------------------------------
>
> Key: FLINK-3138
> URL: https://issues.apache.org/jira/browse/FLINK-3138
> Project: Flink
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.10.2
> Reporter: Stephan Ewen
> Fix For: 1.0.0
>
>
> For many functions (here for example KeySelectors), one can use lambda
> expressions:
> {code}
> DataStream<MyType> stream = ...;
> stream.keyBy( v -> v.getId() )
> {code}
> Java's other syntax for this, Method References, do not work:
> {code}
> DataStream<MyType> stream = ...;
> stream.keyBy( MyType::getId )
> {code}
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