Scott Giles created NIFI-7279:

             Summary: Redis Detect Duplicate Issue
                 Key: NIFI-7279
             Project: Apache NiFi
          Issue Type: Bug
    Affects Versions: 1.11.4
            Reporter: Scott Giles

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/ to

return (v !=null ? valueDeserializer.deserialize(v) : null);

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