让我说我刚刚开始涉足AMQP。
我想从队列中消费/提取数据。我使用Spring的库（spring-boot-starter-amqp）来使事情变得更容易。我有一个侦听器类，其方法在设置队列的地方带有@RabbitListener注释。其他所有内容都是通过属性配置的：
rabbitmq:
username: user
password: password
virtual-host: virtual-host
port: 5672
host: host
queue: _316_
listener:
simple:
retry:
enabled: true
initial-interval: 1000
max-attempts: 8
max-interval: 10000
multiplier: 2.0
stateless: true
一切正常，直到我让主机暂时无法使用为止。发生这种情况时，将断开连接并尝试重新建立连接。重新建立连接后，侦听器不会开始提取消息。重新启动应用程序后，一切都很好，但是我确信可以以某种方式配置它以使消费者不断重新启动，至少它应该在重新建立连接后尝试这样做（或者至少这是我期望的）。
断开连接后，可以在日志中找到以下内容：
org.springframework.amqp.rabbit.listener.BlockingQueueConsumer WARN Cancel received for amq.ctag-PgBSeymWBfsghwdUYr5asA (_316_); Consumer@22ead351: tags=[[amq.ctag-PgBSeymWBfsghwdUYr5asA]], channel=Cached Rabbit Channel: AMQChannel(amqp://user@host,1), conn: Proxy@39549f33 Shared Rabbit Connection: SimpleConnection@6f731759 [delegate=amqp://user@host, localPort= 36678], acknowledgeMode=AUTO local queue size=0
org.springframework.amqp.rabbit.connection.CachingConnectionFactory ERROR Channel shutdown: connection error; protocol method: #method<connection.close>(reply-code=320, reply-text=CONNECTION_FORCED - user 'user' is deleted, class-id=0, method-id=0)
com.rabbitmq.client.impl.ForgivingExceptionHandler WARN An unexpected connection driver error occured (Exception message: Connection reset)
org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer WARN Consumer raised exception, processing can restart if the connection factory supports it. Exception summary: org.springframework.amqp.rabbit.support.ConsumerCancelledException
org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer INFO Restarting Consumer@22ead351: tags=[[]], channel=Cached Rabbit Channel: AMQChannel(amqp://user@host,1), conn: Proxy@39549f33 Shared Rabbit Connection: SimpleConnection@6f731759 [delegate=amqp://user@host, localPort= 36678], acknowledgeMode=AUTO local queue size=0
org.springframework.amqp.rabbit.connection.CachingConnectionFactory INFO Attempting to connect to: [host:5672]
org.springframework.amqp.rabbit.listener.exception.FatalListenerStartupException: Authentication failure\n\tat org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.start(BlockingQueueConsumer.java:564)\n\tat org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.initialize(SimpleMessageListenerContainer.java:1201)\n\tat org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1046)\n\tat java.base/java.lang.Thread.run(Thread.java:835)\nCaused by: org.springframework.amqp.AmqpAuthenticationException: com.rabbitmq.client.AuthenticationFailureException: ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN. org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer","message":"Consumer received fatal exception on startup
org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer ERROR Stopping container from aborted consumer
org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer INFO Waiting for workers to finish.
org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer INFO Successfully waited for workers to finish.
com.rabbitmq.client.impl.ForgivingExceptionHandler WARN An unexpected connection driver error occured (Exception message: Socket closed)
org.springframework.amqp.AmqpAuthenticationException: com.rabbitmq.client.AuthenticationFailureException: ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN. For details see the broker logfile.\n\tat org.springframework.amqp.rabbit.support.RabbitExceptionTranslator.convertRabbitAccessException(RabbitExceptionTranslator.java:65)\n\tat
然后尝试进行连接，我们处于循环中：
org.springframework.amqp.rabbit.connection.CachingConnectionFactory INFO Attempting to connect to: [host]
com.rabbitmq.client.impl.ForgivingExceptionHandler WARN An unexpected connection driver error occured (Exception message: Socket closed)
org.springframework.amqp.AmqpAuthenticationException: com.rabbitmq.client.AuthenticationFailureException: ACCESS_REFUSED
直到重新建立连接：
org.springframework.amqp.rabbit.connection.CachingConnectionFactory INFO Attempting to connect to: [host]
org.springframework.amqp.rabbit.connection.CachingConnectionFactory INFO Created new connection: rabbitConnectionFactory#69d3cf7e:16/SimpleConnection@3931e0ad [delegate=amqp://user@host, localPort= 50574]
并且什么也没有发生-没有消息被占用。
UPDATE：遵循了建议，并打开了DEBUG日志记录。
启动应用程序时，我们是：
org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer DEBUG Starting Rabbit listener container.
创建连接
起始消费者
org.springframework.amqp.rabbit.listener.BlockingQueueConsumer DEBUG Starting consumer Consumer@3daf03d8: tags=[[]], channel=null, acknowledgeMode=AUTO local queue size=0
org.springframework.amqp.rabbit.connection.CachingConnectionFactory DEBUG Creating cached Rabbit Channel from AMQChannel(amqp://user@host,1)
org.springframework.amqp.rabbit.listener.BlockingQueueConsumer DEBUG ConsumeOK: Consumer@3daf03d8: tags=[[amq.ctag-uG8_iXcNaknFjBIGM-91Tg]], channel=Cached Rabbit Channel: AMQChannel(amqp://user@host,1), conn: Proxy@437bd805 Shared Rabbit Connection: SimpleConnection@49fdbe2b [delegate=amqp://user@host, localPort= 37906], acknowledgeMode=AUTO local queue size=0
org.springframework.amqp.rabbit.listener.BlockingQueueConsumer DEBUG Started on queue '_316_' with tag amq.ctag-uG8_iXcNaknFjBIGM-91Tg: Consumer@3daf03d8: tags=[[]], channel=Cached Rabbit Channel: AMQChannel(amqp://user@host,1), conn: Proxy@437bd805 Shared Rabbit Connection: SimpleConnection@49fdbe2b [delegate=amqp://user@host, localPort= 37906], acknowledgeMode=AUTO local queue size=0
org.springframework.amqp.rabbit.listener.BlockingQueueConsumer DEBUG Storing delivery for consumerTag: 'amq.ctag-uG8_iXcNaknFjBIGM-91Tg' with deliveryTag: '1' in Consumer@3daf03d8: tags=[[amq.ctag-uG8_iXcNaknFjBIGM-91Tg]], channel=Cached Rabbit Channel: AMQChannel(amqp://user@host,1), conn: Proxy@437bd805 Shared Rabbit Connection: SimpleConnection@49fdbe2b [delegate=amqp://user@host, localPort= 37906], acknowledgeMode=AUTO local queue size=0
org.springframework.amqp.rabbit.listener.BlockingQueueConsumer DEBUG Received message: (Body:'[B@4b817fae(byte[117])' MessageProperties [headers={}, contentLength=0, redelivered=true, receivedExchange=, receivedRoutingKey=_316_, deliveryTag=1, consumerTag=amq.ctag-uG8_iXcNaknFjBIGM-91Tg, consumerQueue=_316_])
这种情况一直持续到连接断开：
org.springframework.amqp.rabbit.listener.BlockingQueueConsumer WARN Cancel received for amq.ctag-uG8_iXcNaknFjBIGM-91Tg (_316_); Consumer@3daf03d8: tags=[[amq.ctag-uG8_iXcNaknFjBIGM-91Tg]], channel=Cached Rabbit Channel: AMQChannel(amqp:///user@host,1), conn: Proxy@437bd805 Shared Rabbit Connection: SimpleConnection@49fdbe2b [delegate=amqp:///user@host, localPort= 37906], acknowledgeMode=AUTO local queue size=0
通道已关闭，并且用户以某种方式被删除，如日志所述：
org.springframework.amqp.rabbit.connection.CachingConnectionFactory ERROR Channel shutdown: connection error; protocol method: #method<connection.close>(reply-code=320, reply-text=CONNECTION_FORCED - user 'user' is deleted, class-id=0, method-id=0)
与连接驱动程序有关的问题，然后引发异常：
com.rabbitmq.client.impl.ForgivingExceptionHandler WARN An unexpected connection driver error occured (Exception message: Connection reset)
org.springframework.amqp.rabbit.support.ConsumerCancelledException: null\n\tat org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.nextMessage(BlockingQueueConsumer.java:499)\n\tat org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:870)\n\tat org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:859)\n\tat org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$1600(SimpleMessageListenerContainer.java:78)\n\tat org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.mainLoop(SimpleMessageListenerContainer.java:1142)\n\tat org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1048)\n\tat java.base/java.lang.Thread.run(Thread.java:835
消费者提出了例外，并说处理可以使-r-s-t-a-r-t
org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer DEBUG Consumer raised exception, processing can restart if the connection factory supports it
发生重新整理：
org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer INFO Restarting Consumer@3daf03d8: tags=[[]], channel=Cached Rabbit Channel: AMQChannel(amqp://user@host,1), conn: Proxy@437bd805 Shared Rabbit Connection: SimpleConnection@49fdbe2b [delegate=amqp://user@host, localPort= 37906], acknowledgeMode=AUTO local queue size=0
频道正在关闭：
org.springframework.amqp.rabbit.listener.BlockingQueueConsumer DEBUG Closing Rabbit Channel: Cached Rabbit Channel: AMQChannel(amqp://user@host,1), conn: Proxy@437bd805 Shared Rabbit Connection: SimpleConnection@49fdbe2b [delegate=amqp://user@host, localPort= 37906]
org.springframework.amqp.rabbit.connection.CachingConnectionFactory DEBUG Closing cached Channel: AMQChannel(amqp://user@host,1)
新消费者开始了：
org.springframework.amqp.rabbit.listener.BlockingQueueConsumer DEBUG Starting consumer Consumer@2560313a: tags=[[]], channel=null, acknowledgeMode=AUTO local queue size=0
我们正在尝试连接，最终导致WARN和AUTHENTICATION失败，（因为以前的日志说该用户已删除？）：
An unexpected connection driver error occured (Exception message: Socket closed)
org.springframework.amqp.rabbit.listener.exception.FatalListenerStartupException: Authentication failure\n\tat
ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN. For details see the broker logfile.\n\tat org.springframework.amqp.rabbit.support.RabbitExceptionTranslator.convertRabbitAccessException(RabbitExceptionTranslator.java:65)\n\tat
尝试开始的消费者：
org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer ERROR Consumer received fatal exception on startup
并且它（消费者）被取消：
org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer DEBUG Cancelling Consumer@2560313a: tags=[[]], channel=null, acknowledgeMode=AUTO local queue size=0
通道已关闭，容器正在停止：
org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer ERROR Stopping container from aborted consumer
然后容器正在关闭：
org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer DEBUG Shutting down Rabbit listener container
我们正在等待工作人员完成，它成功，然后我们尝试再次连接，相同的SOCKET_CLOSED正在被一遍又一遍地记录。
然后将主机恢复并重新建立连接。正在创建缓存的Rabit Channel，并且没有任何反应。
我以为问题是容器被关闭并且再也没有恢复生命，因此没有消费者。
工作原理：
我创建了一个具有“ listenning”方法的类，该方法接受ListenerContainerConsumerFailedEvent。该类具有RabbitListenerEndpointRegistry（Boot为我方便地创建的bean），并且每当调用该方法时，我都会检查listenerContainer是否正在运行（如果没有运行的话），我会启动它（这种检查很可能是多余的）。
@EventListener
public void onApplicationEvent(ListenerContainerConsumerFailedEvent event) {
var listenerContainer = rabbitListenerEndpointRegistry.getListenerContainer(MessageListener.RABBIT_LISTENER_ID);
if (!listenerContainer.isRunning()){
listenerContainer.start();
}
}
org.springframework.amqp.rabbit.listener.exception.FatalListenerStartupException：身份验证失败
FatalListenerStartupException
认证失败被认为是致命的，容器立即停止；这种情况不太可能会自动纠正。
删除当前正在使用的用户是一种非常不寻常的情况。
您可以使用ApplicationListener bean或@EventListener方法来侦听ListenerContainerConsumerTerminatedEvent，并在一段时间后尝试重新启动容器。