Example KafkaConsumer read and commit

gistfile1.txt

Properties props = new Properties();
        props.put("bootstrap.servers", "localhost:9092");
        props.put("group.id", "consumer-test");
        props.put("enable.auto.commit", "false");
        props.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG, 1);
        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);
        Set<TopicPartition> assignedPartitions = Collections.singleton(new TopicPartition(TOPIC, 0));
        consumer.assign(assignedPartitions);
        consumer.seekToBeginning(assignedPartitions);

        while (true) {
            ConsumerRecords<String, String> records = consumer.poll(2000);
            for (TopicPartition tp : records.partitions()) {
                List<ConsumerRecord<String, String>> tpRecs = records.records(tp);
                ConsumerRecord<String, String> lastMessage = tpRecs.get(tpRecs.size() - 1);
                LOG.info("Polled last message with offset {}, committing offset {}", lastMessage.offset(), lastMessage.offset() + 1);
                consumer.commitSync(Collections.singletonMap(tp, new OffsetAndMetadata(lastMessage.offset() + 1)));
            }
        }