问题：在rabbitMQ测试使用手动接收模式时发生 Failed to declare queue错误

: Channel shutdown: channel error; protocol method: #method<channel.close>(reply-code=406, reply-text=PRECONDITION_FAILED - unknown delivery tag 1, class-id=60, method-id=80)
: Received a frame on an unknown channel, ignoring it
: Received a frame on an unknown channel, ignoring it
: Received a frame on an unknown channel, ignoring it
: Restarting Consumer@2cd2c8fe: tags=[[amq.ctag-RQecbmbYQjunIZtW-ENloQ]], channel=Cached Rabbit Channel: AMQChannel(amqp://guest@IP:5672/,1), conn: Proxy@1b9ea3e3 Shared Rabbit Connection: SimpleConnection@42257bdd [delegate=amqp://guest@IP:5672/], acknowledgeMode=AUTO local queue size=0
: Failed to declare queue: csnz_queue
: Queue declaration failed; retries left=3

org.springframework.amqp.rabbit.listener.BlockingQueueConsumer$DeclarationException: Failed to declare queue(s):[csnz_queue]
at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.attemptPassiveDeclarations(BlockingQueueConsumer.java:710) [spring-rabbit-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.passiveDeclarations(BlockingQueueConsumer.java:594) [spring-rabbit-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.start(BlockingQueueConsumer.java:581) [spring-rabbit-2.1

现象：

监听器第一次重入队成功，第二次试图重入队发生错误

原因

设置的接收模式有问题

解决步骤：

1、排查问题：是什么导致了队列消息丢失？
2、检查代码
3、更改接收模式配置代码
4、重新测试
5、总结，吸取教训

一、排查问题：是什么导致了队列消息丢失？

最开始报错异常为：Channel shutdown，Failed to declare queue
但是检查了一遍逻辑代码，确认没问题，开始怀疑是不是配置的手动接收模式代码错了

二、检查代码

# 配置RabbitMQ 的基本信息 IP 端口 username pass
spring:
  rabbitmq:
    host: 
    port: 5672
    username: guest
    password: guest
    virtual-host: /
    listener:
      direct:
        acknowledge-mode: manual

明明没错啊，acknowledge-mode 就是为 manual，还是idea自动提示补全的呢！

看看别人怎么写这块的

listener.simple.acknowledge-mode = manual

不是吧，居然是 simpl.acknowledge-mode

三、更改接收模式配置代码

# 配置RabbitMQ 的基本信息 IP 端口 username pass
spring:
  rabbitmq:
    host: 
    port: 5672
    username: guest
    password: guest
    virtual-host: /
    listener:
      simple:
        acknowledge-mode: manual