Spring Cloud Stream Kafka>使用来自汇流REST代理的Avro消息

Question

我有以下场景：

• 生产者通过Confluent的REST代理（在Confluent的模式注册表上注册模式）向Kafka主题发送Avro编码的消息，如http://docs.confluent.io/3.0.0/kafka-rest/docs/intro.html#produce-and-consument-avro-messages
所述
• Spring Cloud Stream enabled message侦听主题中的新消息

我的应用程序看起来是这样的：

@SpringBootApplication
@EnableBinding(Sink.class)
public class MyApplication {
  private static Logger log = LoggerFactory.getLogger(MyApplication.class);

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

  @StreamListener(Sink.INPUT)
  public void myMessageSink(MyMessage message) {
    log.info("Received new message: {}", message);
  }
}

而MyMessage是Avro从Avro模式创建的类。

我的Application.Properties如下所示：

spring.cloud.stream.bindings.input.destination=myTopic
spring.cloud.stream.bindings.input.group=${spring.application.name}
spring.cloud.stream.bindings.input.contentType=application/*+avro

org.springframework.messaging.MessagingException: Exception thrown while invoking MyApplication#myMessageSink[1 args]; nested exception is org.apache.avro.AvroRuntimeException: Malformed data. Length is negative: -27
    at org.springframework.cloud.stream.binding.StreamListenerAnnotationBeanPostProcessor$StreamListenerMessageHandler.handleRequestMessage(StreamListenerAnnotationBeanPostProcessor.java:316) ~[spring-cloud-stream-1.1.0.RELEASE.jar:1.1.0.RELEASE]
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:109) ~[spring-integration-core-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:127) ~[spring-integration-core-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116) ~[spring-integration-core-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:148) ~[spring-integration-core-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    ...
Caused by: org.apache.avro.AvroRuntimeException: Malformed data. Length is negative: -27
    at org.apache.avro.io.BinaryDecoder.doReadBytes(BinaryDecoder.java:336) ~[avro-1.8.1.jar:1.8.1]
    at org.apache.avro.io.BinaryDecoder.readString(BinaryDecoder.java:263) ~[avro-1.8.1.jar:1.8.1]
    at org.apache.avro.io.ResolvingDecoder.readString(ResolvingDecoder.java:201) ~[avro-1.8.1.jar:1.8.1]
    at org.apache.avro.generic.GenericDatumReader.readString(GenericDatumReader.java:430) ~[avro-1.8.1.jar:1.8.1]
    at org.apache.avro.generic.GenericDatumReader.readString(GenericDatumReader.java:422) ~[avro-1.8.1.jar:1.8.1]
    at org.apache.avro.generic.GenericDatumReader.readMapKey(GenericDatumReader.java:335) ~[avro-1.8.1.jar:1.8.1]
    at org.apache.avro.generic.GenericDatumReader.readMap(GenericDatumReader.java:321) ~[avro-1.8.1.jar:1.8.1]
    at org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:177) ~[avro-1.8.1.jar:1.8.1]
    at org.apache.avro.specific.SpecificDatumReader.readField(SpecificDatumReader.java:116) ~[avro-1.8.1.jar:1.8.1]
    at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:230) ~[avro-1.8.1.jar:1.8.1]
    at org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:174) ~[avro-1.8.1.jar:1.8.1]
    at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:152) ~[avro-1.8.1.jar:1.8.1]
    at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:144) ~[avro-1.8.1.jar:1.8.1]
    at org.springframework.cloud.stream.schema.avro.AbstractAvroMessageConverter.convertFromInternal(AbstractAvroMessageConverter.java:91) ~[spring-cloud-stream-schema-1.1.0.RELEASE.jar:1.1.0.RELEASE]
    at org.springframework.messaging.converter.AbstractMessageConverter.fromMessage(AbstractMessageConverter.java:175) ~[spring-messaging-4.3.3.RELEASE.jar:4.3.3.RELEASE]
    at org.springframework.messaging.converter.CompositeMessageConverter.fromMessage(CompositeMessageConverter.java:67) ~[spring-messaging-4.3.3.RELEASE.jar:4.3.3.RELEASE]
    at org.springframework.messaging.handler.annotation.support.PayloadArgumentResolver.resolveArgument(PayloadArgumentResolver.java:117) ~[spring-messaging-4.3.3.RELEASE.jar:4.3.3.RELEASE]
    at org.springframework.messaging.handler.invocation.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:112) ~[spring-messaging-4.3.3.RELEASE.jar:4.3.3.RELEASE]
    at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:138) ~[spring-messaging-4.3.3.RELEASE.jar:4.3.3.RELEASE]
    at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:107) ~[spring-messaging-4.3.3.RELEASE.jar:4.3.3.RELEASE]
    at org.springframework.cloud.stream.binding.StreamListenerAnnotationBeanPostProcessor$StreamListenerMessageHandler.handleRequestMessage(StreamListenerAnnotationBeanPostProcessor.java:307) ~[spring-cloud-stream-1.1.0.RELEASE.jar:1.1.0.RELEASE]
    ... 35 common frames omitted

Answer 1

当将per-binding属性spring.cloud.stream.kafka.bindings.input.consumer.configuration.value.deserializer设置为具有Confluent的KafkaAvroDeserializer类名时，它是否起作用？