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https://issues.apache.org/jira/browse/FLINK-9392?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stephan Ewen resolved FLINK-9392.
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Resolution: Fixed
Fix Version/s: 1.6.0
Fixed in fafef15eaca1f4277ac1dddb018a8e01eca22817
> Add @FunctionalInterface annotations to all core functional interfaces
> ----------------------------------------------------------------------
>
> Key: FLINK-9392
> URL: https://issues.apache.org/jira/browse/FLINK-9392
> Project: Flink
> Issue Type: Improvement
> Components: Core
> Reporter: Stephan Ewen
> Assignee: Stephan Ewen
> Priority: Critical
> Fix For: 1.6.0
>
>
> The {{@FunctionalInterface}} annotation should be added to all SAM interfaces
> in order to prevent accidentally breaking them (as non SAMs).
> We had a case of that before for the {{SinkFunction}} which was compatible
> through default methods, but incompatible for users that previously
> instantiated that interface through a lambda.
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