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https://issues.apache.org/jira/browse/AVRO-3848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17762739#comment-17762739
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Andrei Leib commented on AVRO-3848:
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yes, by reflection. Kafka Avro deserilizer does it:
[AbstractKafkaAvroDeserializer|https://github.com/confluentinc/schema-registry/blob/992168be686b2a7a7ea1ae5d496c35e0a057a9a8/avro-serializer/src/main/java/io/confluent/kafka/serializers/AbstractKafkaAvroDeserializer.java#L117-L118]
> MessageDeserializer uses wrong type for map fields
> --------------------------------------------------
>
> Key: AVRO-3848
> URL: https://issues.apache.org/jira/browse/AVRO-3848
> Project: Apache Avro
> Issue Type: Bug
> Reporter: Eduard Schleining
> Priority: Major
>
> When using the avro-maven-plugin to generate classes with map fields, the
> MessageDecoder will disregard the "stringType" setting and always provide a
> map with entries of type UTF8 instead of String.
> You can see the behavior in the unit test here:
> [https://github.com/eschleining/avroMapDeserialization]
> Expected Behavior:
> The org.apache.avro.message.MessageDecoder should use keys and values of type
> String for classes with fields of type Map<String,String>.
> Actual Behavior:
> The org.apache.avro.message.MessageDecoder puts Map<Utf8,Utf8> into fields
> that are generated as Map<String,String>
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