Hi, I am learning Apache Kafka and Spring Boot. I have a Kafka 4.0 broker running locally and a Spring Boot application sending messages to a topic javaguides.
*Below steps I followed:* 1. Started Kafka broker on localhost:9092. 2. Verified the topic exists: .\bin\windows\kafka-topics.bat --bootstrap-server localhost:9092 --list Output: javaguides 3. Sent a message via Spring Boot: http://localhost:8080/api/v1/kafka/publish?message=Hello Kafka Spring Boot logs confirm the message is sent successfully. 4. Tried to consume messages using console consumer: .\bin\windows\kafka-console-consumer.bat --bootstrap-server localhost:9092 --topic javaguides --from-beginning The console consumer starts but *does not display any messages*, even though the topic has data. *Kafka Version:* 4.0 *Spring Boot Version:* 3.x *Spring Kafka Configuration:* spring.kafka.consumer.bootstrap-servers=localhost:9092spring.kafka.consumer.group-id=mygroupspring.kafka.consumer.auto-offset-reset=earliestspring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializerspring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer spring.kafka.producer.bootstrap-servers=localhost:9092spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializerspring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer *Notes:* - I have *not created a consumer class* in Spring Boot; I am relying on the console consumer to read messages. *Questions:* 1. Why does the console consumer not show messages sent by my Spring Boot producer? 2. Is a Spring Boot KafkaConsumer class required for messages to appear in the console consumer? 3. Are there any Kafka 4.0 configuration changes that could prevent the console consumer from receiving messages? Any guidance would be greatly appreciated! Thank you, Kiran Kumar B O
