kafka stream doesn't work in bean in spring boot - apache-kafka

Question

I'm a beginner with kafka stream,
when I create two sample modules one for "Order" and other is "Payment"
In the "Order" Project I use kafka to send to message to "oder-topic"
then in "Payment" I use Kafka listener to received value then send value to other topic( ex: payment-topic).
I want to use kafka Stream in "Order" module to read value from "payment-topic" I define it Order application java class in a "Order" module like this:
#SpringBootApplication
#EnableKafka
#EnableKafkaStreams
public class OrderServiceApplication {
// this topic will received all value that were processed
public static final String OUTPUT_TOPIC_NAME = "ordered";
// this topic is a places received value from payment and stock send value
public static final String INPUT_ORDER_TOPIC_NAME = "order-topic-result";
public static final String INPUT_STOCK_TOPIC_NAME = "stock-topic-result";
public static void main(String[] args) {
SpringApplication.run (OrderServiceApplication.class, args);
}
#Bean
public KStream <String, String> readStream (StreamsBuilder kStreamBuilder) {
KStream <String, String> input = kStreamBuilder.stream(INPUT_ORDER_TOPIC_NAME);
KStream<String, String> output = input.filter((key, value) -> value.length() > 2);
output.to(OUTPUT_TOPIC_NAME);
return output;
}
but the readStream does not work. Please help me
How will I execute the method is automatically after the value was send to this topic