Spring Reactive kafka Receiver always overrides bootstrap server to localhost - spring-boot

Question

I am trying to write Spring boot applications for a Reactive Kafka consumer using #EnableKafka and #KafkaListener annotations.
i have configured my kafka brokers are on different machine. when i give bootstrap-server to advertised host of kafka brokers, it is always overriding advertised host ip addresses to localhost. below are my code.
pom.xml file:-
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
</dependency>
<dependency>
<groupId>io.projectreactor.kafka</groupId>
<artifactId>reactor-kafka</artifactId>
<version>1.0.0.RELEASE</version>
</dependency>
config:-
#Configuration
#EnableKafka
public class AppConfig {
#Bean
Map consumerProps() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.12.12.24:9092,192.14.14.28:9092");
props.put(ConsumerConfig.GROUP_ID_CONFIG, "example-group");
props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, true);
props.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, "100");
props.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, "15000");
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class);
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
return props;
}
#Bean
ReceiverOptions receiverOptions() {
ReceiverOptions receiverOptions = ReceiverOptions.create(consumerProps()).subscription(Arrays.asList("hellochange"));
return receiverOptions;
}
#Bean
public KafkaReceiver kafkaReceiver() {
return KafkaReceiver.create(receiverOptions());
}
}
Consumer:-
#Service
public class ChangeListener {
#Autowired
KafkaReceiver kafkaReceiver;
#KafkaListener(topics="hellochange",groupId="example-group")
public void receiver() {
kafkaReceiver.receive().subscribe(System.out::println);
}
}
Console:-
auto.commit.interval.ms = 5000
auto.offset.reset = latest
bootstrap.servers = [localhost:9092]
check.crcs = true
client.id =
connections.max.idle.ms = 540000
enable.auto.commit = true
2018-06-07 19:59:17.640 WARN 23536 --- [ntainer#0-0-C-1] org.apache.kafka.clients.NetworkClient : [Consumer clientId=consumer-1, groupId=example-group] Connection to node -1 could not be established. Broker may not be available.
I have validated without spring configurations in a simple consumer and non-reactive Spring kafka, for both, it is working fine. only Reactor kafka with EnableKafka and KafkaListener annotations i am getting this problem.
am i missing something/ doing wrong here ?
can we use EnableKafka and KafkaListener annotations with Reactor Kafka in Spring boot?
P.S. i understood, #EnableKafka and #KafkaListener are not reactive, if i remove spring-kafka from pom.xml, both the annotations are not available.
Like #EnableKafka and #KafkaListener for non-reactive kafka, is there any annotations are available to configure reactive kafka consumer with Spring boot application?

Answer 1

You cannot use KafkaListener annotations with Reactor Kafka; #KafkaListener is not reactive.