[JAVA-40985] Added group.id to KafkaListener (#17890)

Author: panos-kakos

spring-kafka/src/main/java/com/baeldung/kafka/embedded/KafkaConsumer.java

@@ -18,7 +18,7 @@ public class KafkaConsumer {
 
     private String payload;
 
-    @KafkaListener(topics = "${test.topic}")
+    @KafkaListener(topics = "${test.topic}", groupId = "${test.groupid}")
     public void receive(ConsumerRecord<?, ?> consumerRecord) {
         LOGGER.info("received payload='{}'", consumerRecord.toString());
 

spring-kafka/src/main/resources/application.properties

@@ -14,6 +14,7 @@ monitor.producer.simulate=true
 monitor.consumer.simulate=true
 monitor.kafka.consumer.groupid.simulate=baeldungGrpSimulate
 test.topic=testtopic1
+test.groupid=baeldung