背景说明
最近在看RabbitMQ相关的内容，当测试到队列的过期时间的时候。一直报错：
reply-text=PRECONDITION_FAILED - inequivalent arg 'x-message-ttl' for queue，
springboot版本：2.5.6
RabbitMQ版本：RabbitMQ 3.8.21 Erlang 24.0.5
完整报错如下：
org.springframework.amqp.AmqpIOException: java.io.IOException
at org.springframework.amqp.rabbit.support.RabbitExceptionTranslator.convertRabbitAccessException(RabbitExceptionTranslator.java:70)
at org.springframework.amqp.rabbit.connection.RabbitAccessor.convertRabbitAccessException(RabbitAccessor.java:113)
at org.springframework.amqp.rabbit.core.RabbitTemplate.doExecute(RabbitTemplate.java:2190)
at org.springframework.amqp.rabbit.core.RabbitTemplate.execute(RabbitTemplate.java:2136)
at org.springframework.amqp.rabbit.core.RabbitTemplate.execute(RabbitTemplate.java:2116)
at org.springframework.amqp.rabbit.core.RabbitAdmin.initialize(RabbitAdmin.java:604)
at org.springframework.amqp.rabbit.core.RabbitAdmin.lambda$null$10(RabbitAdmin.java:532)
at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:329)
at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:209)
at org.springframework.amqp.rabbit.core.RabbitAdmin.lambda$afterPropertiesSet$11(RabbitAdmin.java:531)
at org.springframework.amqp.rabbit.connection.CompositeConnectionListener.lambda$onCreate$0(CompositeConnectionListener.java:38)
at java.util.concurrent.CopyOnWriteArrayList.forEach(CopyOnWriteArrayList.java:895)
at org.springframework.amqp.rabbit.connection.CompositeConnectionListener.onCreate(CompositeConnectionListener.java:38)
at org.springframework.amqp.rabbit.connection.CachingConnectionFactory.createConnection(CachingConnectionFactory.java:730)
at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils.createConnection(ConnectionFactoryUtils.java:252)
at org.springframework.amqp.rabbit.core.RabbitTemplate.doExecute(RabbitTemplate.java:2163)
at org.springframework.amqp.rabbit.core.RabbitTemplate.execute(RabbitTemplate.java:2136)
at org.springframework.amqp.rabbit.core.RabbitTemplate.send(RabbitTemplate.java:1063)
at org.springframework.amqp.rabbit.core.RabbitTemplate.convertAndSend(RabbitTemplate.java:1128)
at org.springframework.amqp.rabbit.core.RabbitTemplate.convertAndSend(RabbitTemplate.java:1121)
at com.bearjun.study.rabbitmq.service.SendMessageService.directProducer(SendMessageService.java:37)
at com.bearjun.study.rabbitmq.service.SendMessageServiceTest.testDirect(SendMessageServiceTest.java:20)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)
at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:210)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:206)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:131)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at java.util.ArrayList.forEach(ArrayList.java:1259)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at java.util.ArrayList.forEach(ArrayList.java:1259)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
Caused by: java.io.IOException
at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:129)
at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:125)
at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:147)
at com.rabbitmq.client.impl.ChannelN.queueDeclare(ChannelN.java:968)
at com.rabbitmq.client.impl.ChannelN.queueDeclare(ChannelN.java:46)
at sun.reflect.GeneratedMethodAccessor30.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.amqp.rabbit.connection.CachingConnectionFactory$CachedChannelInvocationHandler.invoke(CachingConnectionFactory.java:1157)
at com.sun.proxy.$Proxy79.queueDeclare(Unknown Source)
at org.springframework.amqp.rabbit.core.RabbitAdmin.declareQueues(RabbitAdmin.java:709)
at org.springframework.amqp.rabbit.core.RabbitAdmin.lambda$initialize$12(RabbitAdmin.java:606)
at org.springframework.amqp.rabbit.core.RabbitTemplate.invokeAction(RabbitTemplate.java:2225)
at org.springframework.amqp.rabbit.core.RabbitTemplate.doExecute(RabbitTemplate.java:2184)
... 84 more
Caused by: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=406, reply-text=PRECONDITION_FAILED - inequivalent arg 'x-message-ttl' for queue 'springboot.rabbitmq.queue1' in vhost '/': received none but current is the value '15000' of type 'signedint', class-id=50, method-id=10)
at com.rabbitmq.utility.ValueOrException.getValue(ValueOrException.java:66)
at com.rabbitmq.utility.BlockingValueOrException.uninterruptibleGetValue(BlockingValueOrException.java:36)
at com.rabbitmq.client.impl.AMQChannel$BlockingRpcContinuation.getReply(AMQChannel.java:502)
at com.rabbitmq.client.impl.AMQChannel.privateRpc(AMQChannel.java:293)
at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:141)
... 95 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 'springboot.rabbitmq.queue1' in vhost '/': received none but current is the value '15000' of type 'signedint', class-id=50, method-id=10)
at com.rabbitmq.client.impl.ChannelN.asyncShutdown(ChannelN.java:517)
at com.rabbitmq.client.impl.ChannelN.processAsync(ChannelN.java:341)
at com.rabbitmq.client.impl.AMQChannel.handleCompleteInboundCommand(AMQChannel.java:182)
at com.rabbitmq.client.impl.AMQChannel.handleFrame(AMQChannel.java:114)
at com.rabbitmq.client.impl.AMQConnection.readFrame(AMQConnection.java:739)
at com.rabbitmq.client.impl.AMQConnection.access$300(AMQConnection.java:47)
at com.rabbitmq.client.impl.AMQConnection$MainLoop.run(AMQConnection.java:666)
at java.lang.Thread.run(Thread.java:748)
出问题很是纳闷啊？明明设置的都是对的，为嘛会报错呢？
解决过程
尝试1、 删除原来的旧队列（没效果）
因为原来声明的队列没有过期时间TTL的设置，现在重新设置过期时间不会立马生效。
尝试2、 修改队列名称（没效果）
由于偷懒，我的fanout、direct、topic队列都绑定在一个队列上，因此我修改了队列的名称。
尝试3、 百度（没有相关记载）
**尝试4、 Google **
关键词已输入，还真让我找到了，
https://github.com/pmlopes/mod-stomp-io/issues/7 就是这个链接，这个哥们和我遇到的问题一毛一样。只是被人在2014年就已近遇到了。我用翻译软件大概翻译了一下。但是没咋看懂，但我看到最后一张图的时候，我就有一种苗头，是不是虚拟机（Virtual host）有问题。
解决问题
直接去rabbitMQ的控制台，为我当前登录的用户添加一个虚拟主机（Virtual host）demo，修改配置文件中原来的 virtual-host: / ——> virtual-host: demo。重新测试无误。
总结：当我们在RabbitMQ做一些测试或者项目的时候，一定要创建一个Virtual host， 不要用默认的 / ，以免出现不必要的错误。
小弟能力有限，如果还有解决方法有误，或者还有别的解决途径，请留言交流，谢谢。
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