Fix RabbitMQ: AuthenticationFailureException: ACCESS_REFUSED

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:64) ~[spring-rabbit-3.0.5.jar:3.0.5]
 ...
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:385) ~[amqp-client-5.17.0.jar:5.17.0]
...
org.springframework.amqp.rabbit.listener.exception.FatalListenerStartupException: Authentication failure
	at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.start(BlockingQueueConsumer.java:619) ~[spring-rabbit-3.0.5.jar:3.0.5]

Solution:

• Make sure that the spring.rabbitmq.username and spring.rabbitmq.password are correct (the default username and password is guest) in the application.properties.
• If that does not work, check your rabbitMQ server logs.