初次接触 RabbitMQ 出现问题
使用 springboot 集成 RabbitMQ 启动时出现问题
pom.xml

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.6.RELEASE</version>
</parent>

<dependency>
    <groupId>org.springframework.amqp</groupId>
    <artifactId>spring-rabbit</artifactId>
</dependency>

application.yml

spring:
  rabbitmq:
    host: 192.168.163.131
    port: 5672
    username: rabbit
    password: 123456
    virtual-host: /

出现如下问题：

org.springframework.amqp.rabbit.listener.exception.FatalListenerStartupException: Authentication failure
	at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.start(BlockingQueueConsumer.java:576) ~[spring-rabbit-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.initialize(SimpleMessageListenerContainer.java:1196) ~[spring-rabbit-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1041) ~[spring-rabbit-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at java.lang.Thread.run(Thread.java:750) [na:1.8.0_333]
Caused by: org.springframework.amqp.AmqpAuthenticationException: com.rabbitmq.client.AuthenticationFailureException: ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN. For details see the broker logfile.
	at org.springframework.amqp.rabbit.support.RabbitExceptionTranslator.convertRabbitAccessException(RabbitExceptionTranslator.java:65) ~[spring-rabbit-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.amqp.rabbit.connection.AbstractConnectionFactory.createBareConnection(AbstractConnectionFactory.java:509) ~[spring-rabbit-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.amqp.rabbit.connection.CachingConnectionFactory.createConnection(CachingConnectionFactory.java:702) ~[spring-rabbit-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils.createConnection(ConnectionFactoryUtils.java:214) ~[spring-rabbit-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils$RabbitResourceFactory.createConnection(ConnectionFactoryUtils.java:293) ~[spring-rabbit-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils.doGetTransactionalResourceHolder(ConnectionFactoryUtils.java:131) ~[spring-rabbit-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils.getTransactionalResourceHolder(ConnectionFactoryUtils.java:93) ~[spring-rabbit-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils.getTransactionalResourceHolder(ConnectionFactoryUtils.java:76) ~[spring-rabbit-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.start(BlockingQueueConsumer.java:570) ~[spring-rabbit-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	... 3 common frames omitted
Caused by: com.rabbitmq.client.AuthenticationFailureException: ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN. For details see the broker logfile.
	at com.rabbitmq.client.impl.AMQConnection.start(AMQConnection.java:362) ~[amqp-client-5.4.3.jar:5.4.3]
	at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1104) ~[amqp-client-5.4.3.jar:5.4.3]
	at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1054) ~[amqp-client-5.4.3.jar:5.4.3]
	at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:994) ~[amqp-client-5.4.3.jar:5.4.3]
	at org.springframework.amqp.rabbit.connection.AbstractConnectionFactory.createBareConnection(AbstractConnectionFactory.java:462) ~[spring-rabbit-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	... 10 common frames omitted

引发此问题的原因是只在 rabbitMQ 中配置了一个账号
如下操作都是在 Admin & Users 选项卡下完成的

需要在添加一个默认的 guest 账号,密码也是 guest



然后重新启动应用，会发现可以成功启动。至此结束。。。