Issue with ArrayList Serde in Kafka Streams API

Question

Based on my previous question, I am still trying to figure out what\'s the issue with my code.

I\'ve got a most basic topic possible: keys and values are a type of <

Answer 1

As the error indicates, all Serdes need to have a non-argument constructor:

Caused by: org.apache.kafka.common.KafkaException: Could not instantiate class utils.ArrayListSerde Does it have a public no-argument constructor?

You class ArrayListSerde does only have constructor:

public ArrayListSerde(Serde<T> serde) { ... }

Thus, we get this error.

Compare ArrayListSerializer:

// Default constructor needed by Kafka
public ArrayListSerializer() {}

Update:

A standard implementation for ListSerde is WIP and should be included in 2.7 release making custom List Serde obsolete: https://issues.apache.org/jira/browse/KAFKA-8326