[jira] [Commented] (KAFKA-10215) MockProcessorContext doesn't work with SessionStores

["John Roesler (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-10215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17211525#comment-17211525 ] 

John Roesler commented on KAFKA-10215:
--------------------------------------

Note, this will be fixed for the new PAPI MockProcessorContext, at least, by [https://github.com/apache/kafka/pull/9396] .

> MockProcessorContext doesn't work with SessionStores
> ----------------------------------------------------
>
>                 Key: KAFKA-10215
>                 URL: https://issues.apache.org/jira/browse/KAFKA-10215
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>            Reporter: John Roesler
>            Assignee: John Roesler
>            Priority: Major
>             Fix For: 2.7.0
>
>
> The recommended pattern for testing custom Processor implementations is to use the test-utils MockProcessorContext. If a Processor implementation needs a store, the store also has to be initialized with the same context. However, the existing (in-memory and persistent) Session store implementations perform internal casts that result in class cast exceptions if you attempt to initialize them with the MockProcessorContext.
> A workaround is to instead embed the processor in an application and use the TopologyTestDriver instead.
> The fix is the same as for KAFKA-10200



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