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• New class org.apache.kafka.common.serialization.ListSerializer<L extends List<T>, T> implements Serializer<L> ListSerializer<Inner> implements Serializer<List<Inner>> interface
• New class org.apache.kafka.common.serialization.ListDeserializer<L extends List<T>, T> implements Deserializer<L>ListDeserializer<Inner> implements Deserializer<List<Inner>> interface
• New static subclass ListSerde<L extends List<T>, T> extends WrapperSerde<List<T>>subclass class ListSerde<Inner> extends WrapperSerde<List<Inner>> in org.apache.kafka.common.serialization.Serdes
• New method public static <T> Serde<List<T>> <L extends List, Inner> Serde<List<Inner>> ListSerde(Class<? extends List> Class<L> listClass, Serde<T> Serde<Inner> innerSerde) in org.apache.kafka.common.serialization.Serdes class

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This KIP proposes adding new ListSerializer and ListDeserializer classes as well as support for the new ListSerde nested class inside the Serdes class. This will allow using List<L> Serde directly Serde<List<Inner>> directly from Consumers, Producers and Streams where <L extends List<T>, T>.

List<L> Serde<List<Inner>> serialization and deserialization will be done through repeatedly calling a serializer/deserializer for each entry provided by passed generic T Inner's serde. For example, if you want to create List of Strings serde, then serializer/deserializer of Serdes.StringSerde will be used to serialize/deserialize each entry in List<String>.

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