[jira] [Created] (NIFI-5765) WriteJsonResult fails with Class Cast Exception when Choice data type resolves to Array

["Joseph Percivall (JIRA)" <ji...@apache.org>]

Joseph Percivall created NIFI-5765:
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             Summary: WriteJsonResult fails with Class Cast Exception when Choice data type resolves to Array
                 Key: NIFI-5765
                 URL: https://issues.apache.org/jira/browse/NIFI-5765
             Project: Apache NiFi
          Issue Type: Bug
            Reporter: Joseph Percivall
         Attachments: Screen Shot 2018-10-29 at 2.35.50 PM.png, WriteJsonResult_Choice_Array_example.xml

The problem is this line[1]. For the casting, it uses the passed in value instead of the chosen data type.


A template demonstrating the problem is attached. The corner case is hit when there is a choice of data types, and the data type chosen is Array. It properly does everything else but fails when casting it due to: org.apache.nifi.serialization.record.type.ChoiceDataType cannot be cast to org.apache.nifi.serialization.record.type.ArrayDataType.



[1] https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-services/nifi-record-serialization-services-bundle/nifi-record-serialization-services/src/main/java/org/apache/nifi/json/WriteJsonResult.java#L379



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