java.io.IOException

    at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:126)

    at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:122)

    at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:144)

    at com.rabbitmq.client.impl.ChannelN.exchangeDeclare(ChannelN.java:777)

    at com.rabbitmq.client.impl.recovery.AutorecoveringChannel.exchangeDeclare(AutorecoveringChannel.java:237)

    at com.rabbitmq.client.impl.recovery.AutorecoveringChannel.exchangeDeclare(AutorecoveringChannel.java:227)

    at com.dubbo.frame.rabbitmq.sender.config.rabbitmq.SenderUtil.sendData(SenderUtil.java:62)

    at com.dubbo.frame.rabbitmq.sender.service.SenderService.sender1(SenderService.java:32)

    at com.dubbo.frame.rabbitmq.sender.controller.AmqpController.send(AmqpController.java:23)

    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.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:189)

    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)

    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)

    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)

    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:800)

    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)

    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)

    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)

    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)

    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897)

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)

    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:90)

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:117)

    at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:106)

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)

    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)

    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)

    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)

    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)

    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)

    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)

    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)

    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)

    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:791)

    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417)

    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

    at java.lang.Thread.run(Thread.java:748)

Caused by: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=406, reply-text=PRECONDITION_FAILED - inequivalent arg 'type' for exchange 'ex11' in vhost '/': received 'topic' but current is 'fanout', class-id=40, 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:494)

    at com.rabbitmq.client.impl.AMQChannel.privateRpc(AMQChannel.java:288)

    at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:138)

    ... 69 more

Caused by: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=406, reply-text=PRECONDITION_FAILED - inequivalent arg 'type' for exchange 'ex11' in vhost '/': received 'topic' but current is 'fanout', class-id=40, method-id=10)

    at com.rabbitmq.client.impl.ChannelN.asyncShutdown(ChannelN.java:516)

    at com.rabbitmq.client.impl.ChannelN.processAsync(ChannelN.java:346)

    at com.rabbitmq.client.impl.AMQChannel.handleCompleteInboundCommand(AMQChannel.java:178)

    at com.rabbitmq.client.impl.AMQChannel.handleFrame(AMQChannel.java:111)

    at com.rabbitmq.client.impl.AMQConnection.readFrame(AMQConnection.java:670)

    at com.rabbitmq.client.impl.AMQConnection.access$300(AMQConnection.java:48)

    at com.rabbitmq.client.impl.AMQConnection$MainLoop.run(AMQConnection.java:597)

    ... 1 more

第一次创建rabbitmq交换机后，更改交换机类型，继续创建时出现。

原因时存在同名的交换机。

比如rabbitmq服务器中已经存在direct类型的交换机（name=“exchange”），你再创建一个同名的但是类型为fanout时就会出错，需要更换名字后再创建。

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