rabbitmq中已经定义过的非持久化队列再次定义为持久化队列会报如下错误
Exception in thread "main" java.io.IOException at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:106) at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:102) at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:124) at com.rabbitmq.client.impl.ChannelN.queueDeclare(ChannelN.java:844) at com.rabbitmq.client.impl.ChannelN.queueDeclare(ChannelN.java:61) at com.aitongyi.rabbitmq.queues.NewTask.main(NewTask.java:32) Caused by: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=406, reply-text=PRECONDITION_FAILED - inequivalent arg 'durable' for queue 'hello' in vhost '/': received 'true' but current is 'false', class-id=50, method-id=10) at com.rabbitmq.utility.ValueOrException.getValue(ValueOrException.java:67) at com.rabbitmq.utility.BlockingValueOrException.uninterruptibleGetValue(BlockingValueOrException.java:33) at com.rabbitmq.client.impl.AMQChannel$BlockingRpcContinuation.getReply(AMQChannel.java:361) at com.rabbitmq.client.impl.AMQChannel.privateRpc(AMQChannel.java:226) at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:118) ... 3 more Caused by: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=406, reply-text=PRECONDITION_FAILED - inequivalent arg 'durable' for queue 'hello' in vhost '/': received 'true' but current is 'false', class-id=50, method-id=10) at com.rabbitmq.client.impl.ChannelN.asyncShutdown(ChannelN.java:484) at com.rabbitmq.client.impl.ChannelN.processAsync(ChannelN.java:321) at com.rabbitmq.client.impl.AMQChannel.handleCompleteInboundCommand(AMQChannel.java:144) at com.rabbitmq.client.impl.AMQChannel.handleFrame(AMQChannel.java:91) at com.rabbitmq.client.impl.AMQConnection$MainLoop.run(AMQConnection.java:556) at java.lang.Thread.run(Thread.java:744)这是因为已经定义的队列，再次定义是无效的，这就是幂次原理。RabbitMQ不允许重新定义一个已有的队列信息，也就是说不允许修改已经存在的队列的参数。如果你非要这样做，只会返回异常。
