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https://issues.apache.org/jira/browse/FLINK-6549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tzu-Li (Gordon) Tai reopened FLINK-6549:
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> Improve error message for type mismatches with side outputs
> -----------------------------------------------------------
>
>                 Key: FLINK-6549
>                 URL: https://issues.apache.org/jira/browse/FLINK-6549
>             Project: Flink
>          Issue Type: Improvement
>          Components: DataStream API
>    Affects Versions: 1.3.0, 1.4.0
>            Reporter: Chesnay Schepler
>            Assignee: Bowen Li
>            Priority: Minor
>             Fix For: 1.4.0, 1.3.4
>
>
> A type mismatch when using side outputs causes a ClassCastException to be 
> thrown. It would be neat to include the name of the OutputTags in the 
> exception message.
> This can occur when multiple {{OutputTag]}s with different types but 
> identical names are being used.



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