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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-4672) KIP-100 api changes break Java 8 lambda expressions in some cases
Date Sat, 21 Jan 2017 22:11:26 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-4672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15833168#comment-15833168
] 

ASF GitHub Bot commented on KAFKA-4672:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/kafka/pull/2402


> KIP-100 api changes break Java 8 lambda expressions in some cases 
> ------------------------------------------------------------------
>
>                 Key: KAFKA-4672
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4672
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 0.10.2.0
>            Reporter: Xavier Léauté
>            Assignee: Xavier Léauté
>             Fix For: 0.10.2.0, 0.10.3.0
>
>
> Variance changes introduced in KIP-100 cause compilation failures with lambda expression
in Java 8.
> To my knowledge this only affects the following method
> {{KStreams.transform(TransformerSupplier<...>, String...)}}
> prior to the changes it was possible to write
> {{streams.transform(MyTransformer::new)}}
> where {{MyTransformer}} extends {{Transformer}}.
> After the changes the Java compiler is unable to infer correct return types for the lambda
expression.



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