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https://issues.apache.org/jira/browse/KAFKA-10215?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Roesler updated KAFKA-10215:
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Description:
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.
> 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
> Priority: Major
>
> 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.
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