探讨在SpringBoot项目中使用RabbitMQ时，手动ACK机制未生效的异常情况，分析原因并提供解决方案，涉及配置冲突及解决策略。
记一次 SpringBoot-Rabbit MQ设置手动ACK时的异常，配置文件设置了
spring.rabbitmq.listener.simple.acknowledge-mode=manual//表示启动消费方的手动确认
但手动ACK没有生效，代码接收消息后，当业务完毕，执行：
channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);//确认消息已经被消费
异常为：
2018-11-05 17:33:33.090 [ERROR] [AMQP Connection 59.110.229.19:5672] Caller+0 at org.springframework.amqp.rabbit.connection.CachingConnectionFactoryKaTeX parse error: Expected 'EOF', got '#' at position 117: …otocol method: #̲method<channel.…AsyncMessageProcessingConsumer.logConsumerException(SimpleMessageListenerContainer.java:1462)
Consumer raised exception, processing can restart if the connection factory supports it
com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=406, reply-text=PRECONDITION_FAILED - unknown delivery tag 1, class-id=60, method-id=80)
at com.rabbitmq.client.impl.ChannelN.asyncShutdown(ChannelN.java:484)
at com.rabbitmq.client.impl.ChannelN.processAsync(ChannelN.java:321)
at com.rabbitmq.client.impl.AMQChannel.handleCompleteInboundCommand(AMQChannel.java:144)
at com.rabbitmq.client.impl.AMQChannel.handleFrame(AMQChannel.java:91)
at com.rabbitmq.client.impl.AMQConnection
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MainLoop.run(AMQConnection.java:560) at java.lang.Thread.run(Thread.java:748) 2018-11-05 17:33:34.082 [INFO ] [SimpleAsyncTaskExecutor-2] Caller+0 at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer
MainLoop.run(AMQConnection.java:560)atjava.lang.Thread.run(Thread.java:748)2018−11−0517:33:34.082[INFO][SimpleAsyncTaskExecutor−2]Caller+0atorg.springframework.amqp.rabbit.listener.SimpleMessageListenerContainerAsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1453)
Restarting Consumer: tags=[{amq.ctag-zms15dchTPRiv8SH2W0_8Q=videoChange}], channel=Cached Rabbit Channel: AMQChannel(amqp://admin@59.110.229.19:5672/,2), conn: Proxy@131c5bd Shared Rabbit Connection: SimpleConnection@3a500321 [delegate=amqp://admin@59.110.229.19:5672/, localPort= 50032], acknowledgeMode=AUTO local queue size=0
体现重点的有两条：
1、com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=406, reply-text=PRECONDITION_FAILED - unknown delivery tag 1, class-id=60, method-id=80)
表明这条消息对于MQ来说没找到，重点是这个—unknown delivery tag 1-参考rabbitMQ的tag机制可知这条消息已经完成了消费。
2、Restarting Consumer: tags=[{amq.ctag-zms15dchTPRiv8SH2W0_8Q=videoChange}], channel=Cached Rabbit Channel: AMQChannel(amqp://admin@59.110.229.19:5672/,2), conn: Proxy@131c5bd Shared Rabbit Connection: SimpleConnection@3a500321 [delegate=amqp://admin@59.110.229.19:5672/, localPort= 50032], acknowledgeMode=AUTO local queue size=0
表明这条消息被一个设置为自动确认的任务（至于他具体是啥，怎么执行的，没深入看源码，等大神给解释了。）给确认了。
各种百度，发现MQ配置的时候，如果配置了json解析器。如下：
@Bean
public MessageConverter messageConverter() {
return new ContentTypeDelegatingMessageConverter(new Jackson2JsonMessageConverter());
}
则程序会走自动确认消费，配置文件的配置就不生效了（这个不知道为什么，也可能springboot中某些配置的先后顺序的问题）
这个问题解决办法就是重写一下这个东东，用代码设置手动确认。就OK了
@Bean
public RabbitListenerContainerFactory<?> rabbitListenerContainerFactory(ConnectionFactory connectionFactory){
SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
factory.setConnectionFactory(connectionFactory);
factory.setMessageConverter(new Jackson2JsonMessageConverter());
factory.setAcknowledgeMode(AcknowledgeMode.MANUAL);
return factory;
}
转载：https://blog.youkuaiyun.com/m912595719/article/details/83787486
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