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https://issues.apache.org/jira/browse/KAFKA-2897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15030475#comment-15030475
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Yuval Steinberg commented on KAFKA-2897:
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Then how come not only that is seems to work fine for us (except an error in 
the logs), but the community is working with it? Could it be that just the 
Factory is not a critical / commonly used?

> Class NIOServerCnxn$Factory not found due to mismatch in dependencies
> ---------------------------------------------------------------------
>
>                 Key: KAFKA-2897
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2897
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Yuval Steinberg
>            Priority: Trivial
>
> It seems that there is a mismatch between zookeeper & zkclient in kafka 
> pom.xml causes this error upon initialization:
> The pom file (e.g. of kafka_2.10:0.8.2.1) requires zookeeper:3.4.6 & 
> zkclient:0.3, However:
> * While zookeeper:3.3.x had a class NIOServerCnxn$Factory, in 3.4.x it became 
> an independent class (NIOServerCnxnFactory)
> * ZkServer class of zkclient:0.3 is still using (importing) 
> NIOServerCnxn.Factory and only in 0.5 changes to use NIOServerCnxnFactory.
> It seems that the version of zkclient in the pom file should be updated



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