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https://issues.apache.org/jira/browse/NIFI-5775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17036090#comment-17036090
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karthik kadajji edited comment on NIFI-5775 at 2/13/20 10:58 AM:
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Hi [~jpercivall] ,

I was trying to reproduce the same error in testChoiceArray() class. Could you 
please tell me, if for example the schema was of the form [STRING, 
CHOICE[ARRAY[STRING]]] which according to the testclass should have produced

[{"name":"John Doe","path":["10.2.1.3"]}].

are you getting the issue while doing this?


was (Author: karthikkadajji):
Hi Joe,

I was trying to reproduce the same error in testChoiceArray() class. Could you 
please tell me, if for example the schema was of the form [STRING, 
CHOICE[ARRAY[STRING]]] which according to the testclass should have produced 

[\{"name":"John Doe","path":["10.2.1.3"]}].

are you getting the issue while doing this?

> DataTypeUtils "toString" incorrectly treats value as a "byte" when passing an 
> array leading to ClassCastException
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: NIFI-5775
>                 URL: https://issues.apache.org/jira/browse/NIFI-5775
>             Project: Apache NiFi
>          Issue Type: Bug
>    Affects Versions: 1.8.0
>            Reporter: Joe Percivall
>            Priority: Major
>
> To reproduce, change this line[1] to either put "String" as the first choice 
> of record type or just set the key to use string. 
> The resulting error:
> {noformat}
> java.lang.ClassCastException: java.lang.String cannot be cast to 
> java.lang.Byte
>       at 
> org.apache.nifi.serialization.record.util.DataTypeUtils.toString(DataTypeUtils.java:530)
>       at 
> org.apache.nifi.serialization.record.util.DataTypeUtils.convertType(DataTypeUtils.java:147)
>       at 
> org.apache.nifi.serialization.record.util.DataTypeUtils.convertType(DataTypeUtils.java:115)
>       at 
> org.apache.nifi.json.WriteJsonResult.writeValue(WriteJsonResult.java:284)
>       at 
> org.apache.nifi.json.WriteJsonResult.writeRecord(WriteJsonResult.java:187)
>       at 
> org.apache.nifi.json.WriteJsonResult.writeRecord(WriteJsonResult.java:136)
>       at 
> org.apache.nifi.json.TestWriteJsonResult.testChoiceArray(TestWriteJsonResult.java:494)
> {noformat}
> [1] 
> https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-services/nifi-record-serialization-services-bundle/nifi-record-serialization-services/src/test/java/org/apache/nifi/json/TestWriteJsonResult.java#L479



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