KafkaStreams serde exception

Question

i am playing with Kafka and streams technology; i have created a custom serializer and deserializer for the KStream that i will use to receive messages from a given topic.

Answer 1

If you call Serdes.serdeFrom(...) you get a WrappedSerde type back that is for internal usage (and WrappedSerde does not have an non-argument constructor). There is currently no API you can call to get a custom Serde. Instead, you need to implement you own Serde class and wrap you serializer and deserializer "manually".

public class EventMessageSerde implements Serde {
    final private JsonSerializer serializer;
    final private JsonDeserializer deserializer;

    @Override
    public void configure(Map configs, boolean isKey) {
        serializer.configure(configs, isKey);
        deserializer.configure(configs, isKey);
    }

    @Override
    public void close() {
        serializer.close();
        deserializer.close();
    }

    @Override
    public Serializer serializer() {
        return serializer;
    }

    @Override
    public Deserializer deserializer() {
        return deserializer;
    }
}

In your Properties you can set:

streamsConfiguration.put(StreamsConfig.VALUE_SERDE_CLASS_CONFIG, EventMessageSerde.class);