Regarding Sum example

[javaHelper]

I'm sending data like below'

kafka-console-producer --bootstrap-server localhost:9092 --topic numbers-topic
>1223
>1223 
>

I wonder, why I am getting below response?

kafka-console-consumer --topic sum-of-odd-numbers-topic --from-beginning --bootstrap-server localhost:9092 --property value.deserializer=org.apache.kafka.common.serialization.IntegerDeserializer
1650746470

Also, I'm not clear on how to send data to topic as instructions are not clear to me

[OneCricketeer]

not clear on how to send data to topic

You're already using kafka-console-producer.

But this accepts strings, not numbers.

why I am getting below response

You'll need to add --property value.serializer for IntegerSerializer, similar to how you did for the consumer

Or you can edit/run the driver https://github.com/confluentinc/kafka-streams-examples/blob/7.1.1-post/src/main/java/io/confluent/examples/streams/SumLambdaExampleDriver.java#L84