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https://issues.apache.org/jira/browse/NIFI-2903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15582366#comment-15582366
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Kurt Hung commented on NIFI-2903:
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[~markap14] Agree, to send an empty FlowFile is a better solution, since a null 
value is a valid message for Kafka protocol but not an error.
Sure, I'm interested in NiFi, it helps me develop my projects in a short time.

> GetKafka cannot handle null value in Kafka offset cause NullPointerException
> ----------------------------------------------------------------------------
>
>                 Key: NIFI-2903
>                 URL: https://issues.apache.org/jira/browse/NIFI-2903
>             Project: Apache NiFi
>          Issue Type: Bug
>    Affects Versions: 1.0.0, 0.7.0
>            Reporter: Kurt Hung
>
> The GetKafka processor does not handle the condition of null value that 
> exists in Kafka offset, which would cause the processor hang on and generate 
> a NullPointerException after 30 sec. It's easy to reproduce this issue; I use 
> the kafka-python to insert a key-value pair ("abc", None), and create a 
> GetKafka processor to consume the topic I've created. This issue would happen 
> immediately, and moreover, the processor could't consume rest offsets.
> Temporary I customize a GetKafka processor for a "Failure" relationship to 
> handle null values exist in Kafka offset to prevent this issue.



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