[jira] [Commented] (KAFKA-7708) [kafka-streams-scala] Invalid signature for KTable join in 2.12

["Edmondo Porcu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-7708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16710252#comment-16710252 ] 

Edmondo Porcu commented on KAFKA-7708:
--------------------------------------

By the way we have verified there are no real tests, the KTable test is a copy paste of the KStream test and it's joining the Kstream not the Ktables

 

[https://github.com/apache/kafka/blob/trunk/streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/kstream/KTableTest.scala]

 

line 104 / line 127

> [kafka-streams-scala] Invalid signature for KTable join in 2.12
> ---------------------------------------------------------------
>
>                 Key: KAFKA-7708
>                 URL: https://issues.apache.org/jira/browse/KAFKA-7708
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Edmondo Porcu
>            Priority: Major
>
> The signature in Scala 2.12 for the join in the org.kafka.streams.scala.streams.KTable cannot be resolved by the compiler, probably due to the way parameters lists are handled by the compiler .
> See:
>  
> [https://github.com/scala/bug/issues/11288]
> [https://stackoverflow.com/questions/53615950/scalac-2-12-fails-to-resolve-overloaded-methods-with-multiple-argument-lists-whe]
>  
> We are wondering how this is not captured by the current build of Kafka, we are building on 2.12.7 as well



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