Конфигурация Spring Integration DSL KafkaProducerContext

Я пытаюсь адаптировать следующий пример: https://github.com/joshlong/spring-and-kafka

с последними стабильными версиями следующих библиотек:

org.apache.kafka > kafka_2.10 > 0.8.2.2
org.springframework.integration > spring-integration-kafka > 1.2.1.RELEASE
org.springframework.integration > spring-integration-java-dsl > 1.1.0.RELEASE

Библиотека интеграции dsl, похоже, подверглась рефакторингу, вероятно, вызванному введением нового KafkaProducer.

Вот код моей конфигурации Producer:

@Bean(name = OUTBOUND_ID)
IntegrationFlow producer() {
    log.info("starting producer flow..");

    return flowDefinition -> {
        ProducerMetadata<String, String> getProducerMetadata = new ProducerMetadata<>(this.kafkaConfig.getTopic(),
                    String.class, String.class, new StringSerializer(), new StringSerializer());


        KafkaProducerMessageHandler kafkaProducerMessageHandler = Kafka.outboundChannelAdapter(props ->
                props.put("timeout.ms", "35000"))
                .messageKey(m -> m.getHeaders().get(IntegrationMessageHeaderAccessor.SEQUENCE_NUMBER))
                .addProducer(getProducerMetadata, this.kafkaConfig.getBrokerAddress())
                .get();

        flowDefinition
                .handle(kafkaProducerMessageHandler);
    };
}

И код для генерации сообщения:

@Bean
@DependsOn(OUTBOUND_ID)
CommandLineRunner kickOff(@Qualifier(OUTBOUND_ID + ".input") MessageChannel in) {
    return args -> {              
        for (int i = 0; i < 1000; i++) {
            in.send(MessageBuilder.withPayload("#" + i).setHeader(KafkaHeaders.TOPIC, this.kafkaConfig.getTopic()).build());
                log.info("sending message #" + i);
        }
    };
}

Это исключение, которое я получаю:

Caused by: org.springframework.messaging.MessageHandlingException: error occurred in message handler [org.springframework.integration.kafka.outbound.KafkaProducerMessageHandler#0]; nested exception is java.lang.NullPointerException
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:84)
at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116)
at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:101)
at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:97)
at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77)
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:287)
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:245)
at jc.DemoApplication$ProducerConfiguration.lambda$kickOff$0(DemoApplication.java:104)
at org.springframework.boot.SpringApplication.runCommandLineRunners(SpringApplication.java:673)
... 10 more
Caused by: java.lang.NullPointerException
at org.springframework.integration.kafka.support.KafkaProducerContext.getTopicConfiguration(KafkaProducerContext.java:67)
at org.springframework.integration.kafka.support.KafkaProducerContext.send(KafkaProducerContext.java:201)
at org.springframework.integration.kafka.outbound.KafkaProducerMessageHandler.handleMessageInternal(KafkaProducerMessageHandler.java:88)
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:78)
... 18 more

ОБНОВЛЕНИЕ:
Полный рабочий исходный код можно найти в моем форке:
https://github.com/magiccrafter/spring-and-kafka