在运行rabbit模块的spring XD容器上启用了调试日志,它显示第一条消息重复发生以下异常并且消息被重新排队,因此消息处于未确认状态,并且rabbit源无法处理更多消息。
为了解决这个问题,我从 log4j Appender 属性中删除了这个属性,log4j.appender.amqp.contentEncoding=null
. 该属性明确将编码器的名称指定为“null”,这似乎是一个错误。我期待 null 意味着没有指定编码器:)
日志中的异常,随着消息被拒绝并重新排队而不断重复..
19:29:17,713 DEBUG SimpleAsyncTaskExecutor-1 listener.BlockingQueueConsumer:268 - Received message: (Body:'Hello'MessageProperties [headers={categoryName=org.apache.hadoop.yarn.server.nodemanager.NodeManager, level=INFO}, timestamp=Sat Apr 19 19:21:52 PDT 2014, messageId=null, userId=null, appId=NodeManager, clusterId=null, type=null, correlationId=null, replyTo=null, contentType=text/plain, contentEncoding=null, contentLength=0, deliveryMode=PERSISTENT, expiration=null, priority=0, redelivered=true, receivedExchange=test-exch, receivedRoutingKey=rk1, deliveryTag=184015, messageCount=0]) 19:29:17,715 WARN SimpleAsyncTaskExecutor-1 listener.SimpleMessageListenerContainer:530 - Execution of Rabbit message listener failed, and no ErrorHandler has been set. org.springframework.amqp.rabbit.listener.ListenerExecutionFailedException: Listener threw exception at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.wrapToListenerExecutionFailedExceptionIfNeeded(AbstractMessageListenerContainer.java:751) at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:690) at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:583) at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$001(SimpleMessageListenerContainer.java:75) at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$1.invokeListener(SimpleMessageListenerContainer.java:154) at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.invokeListener(SimpleMessageListenerContainer.java:1111) at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:556) at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:904) at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:888) at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$500(SimpleMessageListenerContainer.java:75) at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:989) at java.lang.Thread.run(Thread.java:722) Caused by: org.springframework.amqp.support.converter.MessageConversionException: failed to convert text-based Message content at org.springframework.amqp.support.converter.SimpleMessageConverter.fromMessage(SimpleMessageConverter.java:100) at org.springframework.integration.amqp.inbound.AmqpInboundChannelAdapter$1.onMessage(AmqpInboundChannelAdapter.java:73) at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:688) ... 10 more Caused by: java.io.UnsupportedEncodingException: null at java.lang.StringCoding.decode(StringCoding.java:190) at java.lang.String.(String.java:416) at java.lang.String.(String.java:481) at org.springframework.amqp.support.converter.SimpleMessageConverter.fromMessage(SimpleMessageConverter.java:97) ... 12 more 19:29:17,715 DEBUG SimpleAsyncTaskExecutor-1 listener.BlockingQueueConsumer:657 - Rejecting messages (requeue=true)