[AVRO-3536] Union type not inheriting type conversions

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.11.0
• Fix Version/s: 1.12.0, 1.11.2
• Component/s: java
• Labels: pull-request-available
• Flags: Important
• Assignee: Prathamesh
• Reporter: Prathamesh
• Created: 15/Jun/22 12:15
• Updated: 31/May/24 12:33
• Resolved: 16/Nov/22 17:31

Description

The attached schema has top-level AVRO Union type. Whenever the client tries to deserialize the message it fails at parsing field - opt_amount, with stack trace - 

Caused by: java.lang.ClassCastException: class java.nio.HeapByteBuffer cannot be cast to class java.math.BigDecimal (java.nio.HeapByteBuffer and java.math.BigDecimal are in module java.base of loader 'bootstrap')
at io.confluent.base.model.Test1.put(Test1.java:115)
at org.apache.avro.generic.GenericData.setField(GenericData.java:837)
at org.apache.avro.specific.SpecificDatumReader.readField(SpecificDatumReader.java:139)
at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:248)
at org.apache.avro.specific.SpecificDatumReader.readRecord(SpecificDatumReader.java:123)
at org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:180)
at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:161)
at org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:188)
at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:161)
at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:154)
at io.confluent.kafka.serializers.AbstractKafkaAvroDeserializer$DeserializationContext.read(AbstractKafkaAvroDeserializer.java:400) 

The sample message you can try is -

{ "io.confluent.base.model.Test1": { "opt_amount": { "bytes": "10.2" } } } 

Issue Links

• is related to: AVRO-3989 Schema conversion for logical types ignored when type is part of union
• is related to: AVRO-3580 .NET/#C: Support union (nullable) for converters for ReflectReader/Writer
• links to: GitHub Pull Request #1721
• links to: GitHub Pull Request #23157
• links to: GitHub Pull Request #23524