今天测试RabbitMQ中 TTL队列时，出现一个错误，错误信息如下：
Exception in thread “main” java.io.IOException
at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:124)
at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:120)
at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:142)
at com.rabbitmq.client.impl.ChannelN.queueDeclare(ChannelN.java:958)
at com.rabbitmq.client.impl.recovery.AutorecoveringChannel.queueDeclare(AutorecoveringChannel.java:333)
at com.fu.rabbitemq.ttl.Producer.main(Producer.java:27)
Caused by: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=406, reply-text=PRECONDITION_FAILED - inequivalent arg ‘x-message-ttl’ for queue ‘queue_ttl_1’ in vhost ‘/’: received the value ‘10000’ of type ‘signedint’ but current is none, class-id=50, method-id=10)
at com.rabbitmq.utility.ValueOrException.getValue(ValueOrException.java:66)
at com.rabbitmq.utility.BlockingValueOrException.uninterruptibleGetValue(BlockingValueOrException.java:36)
at com.rabbitmq.client.impl.AMQChannel$BlockingRpcContinuation.getReply(AMQChannel.java:443)
at com.rabbitmq.client.impl.AMQChannel.privateRpc(AMQChannel.java:263)
at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:136)
… 3 more
Caused by: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=406, reply-text=PRECONDITION_FAILED - inequivalent arg ‘x-message-ttl’ for queue ‘queue_ttl_1’ in vhost ‘/’: received the value ‘10000’ of type ‘signedint’ but current is none, class-id=50, method-id=10)
at com.rabbitmq.client.impl.ChannelN.asyncShutdown(ChannelN.java:515)
at com.rabbitmq.client.impl.ChannelN.processAsync(ChannelN.java:340)
at com.rabbitmq.client.impl.AMQChannel.handleCompleteInboundCommand(AMQChannel.java:162)
at com.rabbitmq.client.impl.AMQChannel.handleFrame(AMQChannel.java:109)
at com.rabbitmq.client.impl.AMQConnection.readFrame(AMQConnection.java:676)
at com.rabbitmq.client.impl.AMQConnection.access$300(AMQConnection.java:48)
at com.rabbitmq.client.impl.AMQConnection$MainLoop.run(AMQConnection.java:603)
at java.lang.Thread.run(Thread.java:748)
解决方案
经过排查，原来是服务器中已经有了 queue_ttl_1 这个队列，并且这个队列不是 ttl队列，所以才会再次创建的时候报错。
删除该队列，重新运行代码即可。正确运行如下： 