Spring AMQP中的CannotLoadBeanClassException

Question

I am very new to spring amqp. I am trying to run a sample application, and the sender code is running successfully but the listener code is throwing an error. Please help. Please find the codes in the link below - https://www.journaldev.com/11713/spring-amqp-rabbitmq-example

The error thrown -

Exception in thread "main" org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.tp.spring.amqp.rabbit.SpringAMQPRabbitAyncListener] for bean with name 'asyncListener' defined in class path resource [springamqp-rabbt-listener-context.xml]; nested exception is java.lang.ClassNotFoundException: com.tp.spring.amqp.rabbit.SpringAMQPRabbitAyncListener

The error I am getting now when I run the SpringAMQPRabbitListenerContainer.java, is as shown below-

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details. Exception in thread "main" org.springframework.context.ApplicationContextException: Failed to start bean 'myListenerContainer'; nested exception is org.springframework.amqp.AmqpIllegalStateException: Fatal exception on listener startup at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:170) at org.springframework.context.support.DefaultLifecycleProcessor.access$1(DefaultLifecycleProcessor.java:154) at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:339) at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:143) at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:108) at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:926) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:467) at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContex t.java:139) at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:83) at com.tp.spring_amqp_rabbitmq.SpringAMQPRabbitListenerContainer.main(SpringAMQPRabbitListenerContainer.java:9) Caused by: org.springframework.amqp.AmqpIllegalStateException: Fatal exception on listener startup at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doStart(SimpleMessageListenerContainer.java:333) at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.start(AbstractMessageListenerContainer.java:360) at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:167) ... 9 more Caused by: org.springframework.amqp.rabbit.listener.FatalListenerStartupException: Cannot prepare queue for listener. Either the queue doesn't exist or the broker will not allow us to use it. at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.start(BlockingQueueConsumer.java:228) at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:516) at java.lang.Thread.run(Unknown Source) Caused by: java.io.IOException at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:124) at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:120) at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:142) at com.rabbitmq.client.impl.ChannelN.queueDeclarePassive(ChannelN.java:996) at com.rabbitmq.client.impl.recovery.AutorecoveringChannel.queueDeclarePassive(AutorecoveringChannel.java:364) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.springframework.amqp.rabbit.con nection.CachingConnectionFactory$CachedChannelInvocationHandler.invoke(CachingConnectionFactory.java:348) at com.sun.proxy.$Proxy2.queueDeclarePassive(Unknown Source) at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.start(BlockingQueueConsumer.java:213) ... 2 more Caused by: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method(reply-code=404, reply-text=NOT_FOUND - no queue 'tpQueue' in vhost '/', class-id=50, method-id=10) at com.rabbitmq.utility.ValueOrException.getValue(ValueOrException.java:66) at com.rabbitmq.utility.BlockingValueOrException.uninterruptibleGetValue(BlockingValueOrException.java:36) at com.rabbitmq.client.impl.AMQChannel$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) ... 11 more Caused by: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method(reply-code=404, reply-text=NOT_FOUND - no queue 'tpQueue' in vhost '/', class-id=50, method-id=10) at com.rabbitmq.client.impl.ChannelN.asyncShutdown(ChannelN.java:509) 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:643) at com.rabbitmq.client.impl.AMQConnection.access$300(AMQConnection.java:47) at com.rabbitmq.client.impl.AMQConnection$MainLoop.run(AMQConnection.java:581) ... 1 more

Answer 1

You really should be sure that the class com.tp.spring.amqp.rabbit.SpringAMQPRabbitAyncListener is on your classpath.

I understand that XML config my mislead, but without that class in the mentioned com.tp.spring.amqp.rabbit package it really isn't going to work.

Plus pay attention how that class has a type in the Async part.