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https://issues.apache.org/jira/browse/NIFI-7882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17762159#comment-17762159
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Michael W Moser commented on NIFI-7882:
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The Avro library was upgraded to 1.11.0 in NIFI-7234
> Null as default value in avro generates exception
> -------------------------------------------------
>
> Key: NIFI-7882
> URL: https://issues.apache.org/jira/browse/NIFI-7882
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Reporter: Dominik Przybysz
> Priority: Major
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> When I have a record without value for fields, then missing fields will be
> populated with default values from schema. It was added in
> https://issues.apache.org/jira/browse/NIFI-4030
> But when null is default value then avro 1.8.1 returns
> org.apache.avro.JsonProperties$Null which cannot be converted to null value
> (the issue in avro is described in
> https://issues.apache.org/jira/browse/AVRO-1954) and processors fail with
> error:
> {code}
> ERROR o.a.n.p.standard.ConvertRecord -
> ConvertRecord[id=37460cbe-17f1-4456-a6b9-f4ed1baa4c45] Failed to process
> FlowFile[0,436030859382835.mockFlowFile,161B]; will route to failure:
> org.apache.avro.file.DataFileWriter$AppendWriteException:
> org.apache.avro.AvroRuntimeException: Unknown datum type
> org.apache.avro.JsonProperties$Null:
> org.apache.avro.JsonProperties$Null@1723f29f
> {code}
> Probably Apache Nifi should upgrade to newer avro or backport the fix from
> avro 1.9.x to AvroTypeUtil
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