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  KafkaConsumer consumer = new KafkaConsumer<>(consumerConfig);
  // Recommend a smaller txn timeout, for example 10 seconds.
  producerConfig.put(ProducerConfig.TRANSACTION_TIMEOUT_CONFIG, 10000);
  KafkaProducer producer = new KafkaProducer(producerConfig);

  producer.initTransactions();	
  while (true) {
    // Read some records from the consumer and collect the offsets to commit
    ConsumerRecords consumed = consumer.poll(Duration.ofMillis(5000)); // This will be the fencing point if there are pending offsets for the first time.
    Map<TopicPartition, OffsetAndMetadata> consumedOffsets = offsets(consumed);

    // Do some processing and build the records we want to produce
    List<ProducerRecord> processed = process(consumed);

    // Write the records and commit offsets under a single transaction
    producer.beginTransaction();
    for (ProducerRecord record : processed)
      producer.send(record);

	// Pass the entire consumer group metadata
    producer.sendOffsetsToTransaction(consumedOffsets, consumer.groupMetadata());

    producer.commitTransaction();
  }