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https://issues.apache.org/jira/browse/KAFKA-8326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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A. Sophie Blee-Goldman resolved KAFKA-8326.
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Fix Version/s: 3.0.0
Resolution: Fixed
> Add Serde<List<Inner>> support
> ------------------------------
>
> Key: KAFKA-8326
> URL: https://issues.apache.org/jira/browse/KAFKA-8326
> Project: Kafka
> Issue Type: Improvement
> Components: clients, streams
> Reporter: Daniyar Yeralin
> Assignee: Daniyar Yeralin
> Priority: Minor
> Labels: kip
> Fix For: 3.0.0
>
>
> _This ticket proposes adding new {color:#4c9aff}ListSerializer{color} and
> {color:#4c9aff}ListDeserializer{color} classes as well as support for the new
> classes into the Serdes class. This will allow using List Serde of type_
> {color:#4c9aff}_Serde<List<Inner>>_{color} _directly from Consumers,
> Producers and Streams._
> _{color:#4c9aff}Serde<List<Inner>>{color} serialization and deserialization
> will be done through repeatedly calling a serializer/deserializer for each
> entry provided by passed generic {color:#4c9aff}Inner{color}'s Serde. For
> example, if you want to create List of Strings serde, then
> serializer/deserializer of StringSerde will be used to serialize/deserialize
> each entry in {color:#4c9aff}List<String>{color}._
> I believe there are many use cases where List Serde could be used:
> *
> [https://stackoverflow.com/questions/41427174/aggregate-java-objects-in-a-list-with-kafka-streams-dsl-windows]
> *
> [https://stackoverflow.com/questions/46365884/issue-with-arraylist-serde-in-kafka-streams-api]
> For instance, aggregate grouped (by key) values together in a list to do
> other subsequent operations on the collection.
> KIP Link:
> [https://cwiki.apache.org/confluence/display/KAFKA/KIP-466%3A+Add+support+for+List%3CT%3E+serialization+and+deserialization]
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