Hi,
 
I am trying to create couchbase document_id (PutCouchbaseKey processor) as
json key "stud_id" using expression-language but i am getting below error.

due to uncaught
Exception:org.apache.nifi.attribute.expressac_noguage.exception.AttributeExpressionLanguageException:Subject
is empty.

Keys:-
{stud_id,first_name,last_name}

My Teamplate:- 

ExecuteHQL->SplitAvro->AvroToJson->PutCouch


nifi1.PNG
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