Question

我在消费者方面遇到以下错误：

Kibana

我看不出问题所在。收到的类型与处理程序的类型匹配。映射是可能的...

org.springframework.kafka.KafkaException: No method found for class xxx.web.json.customer.ContractRequestDto
        at org.springframework.kafka.listener.adapter.DelegatingInvocableHandler.getHandlerForPayload(DelegatingInvocableHandler.java:170)

还有听众：

@EnableKafka
@Configuration
public class KafkaConfiguration {

    @Value(value = "${kafka.servers}")
    private String bootstrapAddress;

    @Value(value = "${kafka.groups.customer.name}")
    private String customerGroup;

    @Bean
    public ConcurrentKafkaListenerContainerFactory<String, Object> containerFactory() {    
        ConcurrentKafkaListenerContainerFactory<String, Object> factory = new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConsumerFactory(new DefaultKafkaConsumerFactory<String, Object>(getConsumerFactoryProperties()));        
        factory.setConcurrency(5);
        return factory;
    }

    private Map<String, Object> getConsumerFactoryProperties() {
        Map<String, Object> props = new HashMap<>();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
        props.put(ConsumerConfig.GROUP_ID_CONFIG, customerGroup);
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, JsonDeserializer.class.getName());
        props.put(JsonDeserializer.TRUSTED_PACKAGES, "*");
        return props;
    }

}

我的参数用@Payload注释，因此根据文档，它应该可以工作。你有好主意吗？谢谢。

Answer 1

我将不得不看一下代码，看看我们是否支持获取完整的ConsumerRecord及其value()（有效载荷）。

但是，由于您已经可以通过record.value()来访问它，因此是多余的，因此我不确定您为什么要这样做。

编辑

我刚刚编写了一个测试应用程序，对我来说很好用；所以正在发生其他事情；也许您的DTO在不同的包装中？

@SpringBootApplication
public class So59970536Application {

    public static void main(String[] args) {
        SpringApplication.run(So59970536Application.class, args);
    }


    @Bean
    public NewTopic topic() {
        return TopicBuilder.name("so59970536").partitions(1).replicas(1).build();
    }

    @Bean
    public ApplicationRunner runner(KafkaTemplate<String, Foo> template) {
        return args -> template.send("so59970536", new Foo("bar"));
    }

    public static class Foo {

        private String bar;

        public Foo() {
        }

        public Foo(String bar) {
            this.bar = bar;
        }

        public String getBar() {
            return this.bar;
        }

        public void setBar(String bar) {
            this.bar = bar;
        }

        @Override
        public String toString() {
            return "Foo [bar=" + this.bar + "]";
        }

    }

}

@Component
@KafkaListener(id = "so59970536", topics = "so59970536")
class Listener {

    @KafkaHandler
    public void listen(ConsumerRecord<String, Foo> record, @Payload Foo foo) {
        System.out.println(foo);
        System.out.println(record);
    }

}

spring.kafka.consumer.auto-offset-reset=earliest
spring.kafka.producer.value-serializer=org.springframework.kafka.support.serializer.JsonSerializer
spring.kafka.consumer.value-deserializer=org.springframework.kafka.support.serializer.JsonDeserializer
spring.kafka.consumer.properties.spring.json.trusted.packages=*

和

Foo [bar = bar]

ConsumerRecord（topic = so59970536，分区= 0，leaderEpoch = 0，偏移量= 2，CreateTime = 1580315933731，序列化密钥大小= -1，序列化值大小= 13，标头= RecordHeaders（标头= []，isReadOnly = false ），键=空，值= Foo [bar = bar]）

找不到给定有效负载的处理程序

1 个答案: