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https://issues.apache.org/jira/browse/NIFI-7279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17066818#comment-17066818
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Pierre Villard commented on NIFI-7279:
--------------------------------------

Hi [~ScottGiles62] - thanks for reporting this! Do you want to open a pull 
request with your suggested fix?

> Redis Detect Duplicate Issue
> ----------------------------
>
>                 Key: NIFI-7279
>                 URL: https://issues.apache.org/jira/browse/NIFI-7279
>             Project: Apache NiFi
>          Issue Type: Bug
>    Affects Versions: 1.11.4
>            Reporter: Scott Giles
>            Priority: Major
>
> When using a DetectDuplicate processor with a 
> RedisDistributedMapCacheClientService cache service, if the Cache Entry 
> Identifier is not in the cache and Cache The Entry Identifier is set to 
> "false", a NullPointerException is thrown rather than the expected 
> non-duplicate relationship.
>  
> A possible fix would be to change line 202 of 
> java/org/apache/nifi/redis/service/RedisDistributedMapCacheClientService.java 
> to
> return (v !=null ? valueDeserializer.deserialize(v) : null);



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