Spring Cloud Stream Kafka活页夹无法通过密钥发布到DLQ

时间：2019-03-22 20:40:23

标签： apache-kafka spring-cloud-stream

当"""First layer of the neural network. Args: net: 2D tensor (batch-size, number of vocabulary tokens), l2_reg_val: float -- regularization coefficient. is_training: boolean tensor.A Returns: 2D tensor (batch-size, 40), where 40 is the hidden dimensionality. """ l2_reg = tf.contrib.layers.l2_regularizer(l2_reg_val) net = tf.nn.l2_normalize(net, dim = 1) net = tf.contrib.layers.fully_connected( net, 40, activation_fn=None,biases_initializer=None)#, weights_regularizer=loss) output = l2_reg_val*sum(net ** 2) / 2 net=tf.losses.add_loss(output, loss_collection=tf.GraphKeys.REGULARIZATION_LOSSES) 处理失败并且Spring Cloud Stream Kafka活页夹试图将消息重新路由到DLQ时，出现以下异常。使用Spring Cloud Edgware.SR5。

@StreamListener

试图从org.springframework.messaging.MessageDeliveryException: failed to send Message to channel 'my.message.destination.my.message.group.errors'; nested exception is java.lang.ClassCastException: java.lang.String cannot be cast to [B at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:451) ~[spring-integration-core-4.3.17.RELEASE.jar:4.3.17.RELEASE] at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:375) ~[spring-integration-core-4.3.17.RELEASE.jar:4.3.17.RELEASE] at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115) ~[spring-messaging-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:45) ~[spring-messaging-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:105) ~[spring-messaging-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:95) ~[spring-messaging-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.integration.support.ErrorMessagePublisher.publish(ErrorMessagePublisher.java:155) ~[spring-integration-core-4.3.17.RELEASE.jar:4.3.17.RELEASE] at org.springframework.integration.handler.advice.ErrorMessageSendingRecoverer.recover(ErrorMessageSendingRecoverer.java:83) ~[spring-integration-core-4.3.17.RELEASE.jar:4.3.17.RELEASE] at org.springframework.retry.support.RetryTemplate.handleRetryExhausted(RetryTemplate.java:512) ~[spring-retry-1.2.2.RELEASE.jar:?] at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:351) ~[spring-retry-1.2.2.RELEASE.jar:?] at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:180) ~[spring-retry-1.2.2.RELEASE.jar:?] at org.springframework.kafka.listener.adapter.RetryingAcknowledgingMessageListenerAdapter.onMessage(RetryingAcknowledgingMessageListenerAdapter.java:73) ~[spring-kafka-1.1.8.RELEASE.jar:?] at org.springframework.kafka.listener.adapter.RetryingAcknowledgingMessageListenerAdapter.onMessage(RetryingAcknowledgingMessageListenerAdapter.java:39) ~[spring-kafka-1.1.8.RELEASE.jar:?] at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeRecordListener(KafkaMessageListenerContainer.java:792) [spring-kafka-1.1.8.RELEASE.jar:?] at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeListener(KafkaMessageListenerContainer.java:736) [spring-kafka-1.1.8.RELEASE.jar:?] at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.access$2100(KafkaMessageListenerContainer.java:246) [spring-kafka-1.1.8.RELEASE.jar:?] at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer$ListenerInvoker.run(KafkaMessageListenerContainer.java:1025) [spring-kafka-1.1.8.RELEASE.jar:?] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_192] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_192] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_192] Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to [B at org.springframework.cloud.stream.binder.kafka.KafkaMessageChannelBinder$4.handleMessage(KafkaMessageChannelBinder.java:360) ~[spring-cloud-stream-binder-kafka-1.3.3.RELEASE.jar:1.3.3.RELEASE] at org.springframework.integration.dispatcher.BroadcastingDispatcher.invokeHandler(BroadcastingDispatcher.java:236) ~[spring-integration-core-4.3.17.RELEASE.jar:4.3.17.RELEASE] at org.springframework.integration.dispatcher.BroadcastingDispatcher.dispatch(BroadcastingDispatcher.java:185) ~[spring-integration-core-4.3.17.RELEASE.jar:4.3.17.RELEASE] at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:89) ~[spring-integration-core-4.3.17.RELEASE.jar:4.3.17.RELEASE] at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:425) ~[spring-integration-core-4.3.17.RELEASE.jar:4.3.17.RELEASE] ... 19 more 生成消息，并发现只有在使用Kafka密钥时才会发生这种情况。

以下是相关的代码段：

MyMessageConsumer.java：

kafka-console-producer

application.properties（针对消费者）：

  @StreamListener(MyMessageSink.MY_MESSAGE_INPUT)
  @Transactional
  public void consumeMyMessage(@Header(KafkaHeaders.RECEIVED_MESSAGE_KEY) String myMessageId, @Payload MyMessage myMessage) {
    if (true) {
      throw new RuntimeException("MockRuntimeException");
    }
  }

application.properties（对于生产者）：

spring.kafka.producer.keySerializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.consumer.keyDeserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.cloud.stream.bindings.my-message-in.destination=my.message.destination
spring.cloud.stream.bindings.my-message-in.group=my.message.group
spring.cloud.stream.bindings.my-message-in.content-type=application/json
spring.cloud.stream.bindings.my-message-in.consumer.headerMode=raw
spring.cloud.stream.bindings.my-message-in.consumer.partitioned=true
spring.cloud.stream.kafka.bindings.my-message-in.consumer.enableDlq=true
spring.cloud.stream.kafka.bindings.my-message-in.consumer.dlqName=my.message.destination.dlq
spring.cloud.stream.kafka.bindings.my-message-in.consumer.dlqProducerProperties.configuration.key.serializer=org.apache.kafka.common.serialization.StringSerializer
spring.cloud.stream.kafka.bindings.my-message-in.consumer.dlqProducerProperties.configuration.value.serializer=org.apache.kafka.common.serialization.StringSerializer
spring.cloud.stream.kafka.bindings.my-message-in.consumer.maxAttempts=3

有什么方法可以使DLQ重新路由以使用消息密钥吗？

1 个答案:

答案 0 :(得分：0)

1.3.x的死字体仅支持Spring Cloud Stream的默认键/值类型（byte[]/byte[]）。

尝试升级到最新版本。

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