Kafka Consumer Using Java

package com.abc.demo;

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;
import java.util.concurrent.ExecutionException;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.serialization.StringDeserializer;

public class KafkaConsumerTest {

 public static void main(String[] args) throws InterruptedException, ExecutionException{
  //Create consumer property
  String bootstrapServer = "localhost:9092";
  String groupId = "my-first-consumer-group";
  String topicName = "my-first-topic";
  
  Properties properties = new Properties();
  properties.setProperty(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServer);
  properties.setProperty(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
  properties.setProperty(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
  properties.setProperty(ConsumerConfig.GROUP_ID_CONFIG, groupId);
  properties.setProperty(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  properties.setProperty(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "false");
  
  //Create consumer
  KafkaConsumer<String, String> consumer = new KafkaConsumer<>(properties);
  
  //Subscribe consumer to topic(s)
  consumer.subscribe(Collections.singleton(topicName));
  
  
  //Poll for new data
  while(true){
   ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(1000));
   
   for(ConsumerRecord<String, String> record: records){
    System.out.println(record.key() + record.value());
    System.out.println(record.topic() + record.partition() + record.offset());
   }
   
   //Commit consumer offset manually (recommended)
   consumer.commitAsync();
  }
  
 }
}