Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

NPE on instantiation when GroupID missing

See original GitHub issue

Exception appeared in io.confluent.parallelconsumer.ParallelEoSStreamProcessor.checkAutoCommitIsDisabled. Looks like (ConsumerCoordinator)coordinatorField.get(consumer) returns a null;

The code of a creation of ParallelStreamProcessor:

@Slf4j
@Component
public class ParallelConsumer {
    String inputTopic = "test-topic";

    public ParallelConsumer() {
        consume();
    }

    public ParallelStreamProcessor getParallelConsumer(){
        org.apache.kafka.clients.consumer.Consumer<String, String> kafkaConsumer = getKafkaConsumer(); // (1)

        ParallelConsumerOptions<String, String> options = ParallelConsumerOptions.<String, String>builder()
                .ordering(KEY) // (2)
                .maxConcurrency(1000) // (3)
                .consumer(kafkaConsumer)
                .build();

        ParallelStreamProcessor<String, String> eosStreamProcessor =
                ParallelStreamProcessor.createEosStreamProcessor(options);

        eosStreamProcessor.subscribe(of(inputTopic)); // (4)

        return eosStreamProcessor;
    }

    org.apache.kafka.clients.consumer.Consumer<String, String> getKafkaConsumer() {
        Properties properties = new Properties();
        properties.setProperty(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
        properties.setProperty(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        properties.setProperty(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        properties.setProperty(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "false");
        return new KafkaConsumer<>(properties);
    }

    public void consume () {
        getParallelConsumer().poll(record ->
                log.info("Concurrently processing a record: {}", record));
    }

}