Экосистема Java-приложений — Apache Kafka и потоковая обработка событий

Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("group.id", "payment-group");
props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");

KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
consumer.subscribe(Collections.singletonList("orders"));

while (true) {
    ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100));
    for (ConsumerRecord<String, String> record : records) {
        System.out.printf("key=%s value=%s%n", record.key(), record.value());
    }
}