Simon Bence created NIFI-7390:
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Summary: Avro writing fails when narrow data type arrives
Key: NIFI-7390
URL: https://issues.apache.org/jira/browse/NIFI-7390
Project: Apache NiFi
Issue Type: Bug
Components: Extensions
Environment: Nifi 1.9 but probably other versions
Reporter: Simon Bence
Assignee: Simon Bence
Fix For: 1.12.0
We expect a Long during writing the Avro record, but try to write in an Integer
and as there is no inheritance between them, it fails with class cast exception.
The reason we try to write Integer: the incoming number from JSON is parsed by
Jackson and unmarshalled based on the value, not the expected schema. If the
actual value fits to Integer, it will use that, otherwise it will be a Long. It
has no knowledge of the expected schema. In a later point when we consider the
input valid (we do allow “narrow number types” both in strict and non strict
validation), the Avro specific writer thinks it a Long based on the validation
schema and fails to write it.
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