带有 MANUAL_IMMEDIATE ack 的 Spring Boot Kafka

Question

我有一个 Springboot 应用程序。使用此配置：

  kafka:
    consumer:
      listener:
        ack-mode: MANUAL_IMMEDIATE

广告此消费者：

@KafkaListener(topics = "test", groupId = "group_id")
    public void consume(String message, Acknowledgment ack) throws IOException {
            ack.acknowledge();
    }

但收到消息时出现此错误：

org.springframework.messaging.converter.MessageConversionException: Cannot convert from [java.lang.String] to [org.springframework.kafka.support.Acknowledgment] for GenericMessage 

Answer 1

您的 YAML 似乎没有被读取；我刚刚测试过

更正

您的 YAML 无效 - 删除 consumer 元素。

spring:
  kafka:
    consumer:
      auto-offset-reset: earliest
    listener:
      ack-mode: MANUAL_IMMEDIATE

而且效果很好；删除 ack-mode 会出现与您看到的相同的错误。

@SpringBootApplication
public class So60929385Application {

    public static void main(String[] args) {
        SpringApplication.run(So60929385Application.class, args);
    }

    @KafkaListener(id = "so60929385", topics = "so60929385")
    public void listen(String in, Acknowledgment ack) {
        System.out.println(in);
        ack.acknowledge();
    }

    @Bean
    public ApplicationRunner runner(KafkaTemplate<String, String> template) {
        return args -> template.send("so60929385", "foo");
    }

    @Bean
    public NewTopic topic() {
        return TopicBuilder.name("so60929385").partitions(1).replicas(1).build();
    }
}