[fix] RabbitMQ: AuthenticationFailureException ACCESS_REFUSED Login refused authentication mechanism PLAIN

Exception in thread "main" 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)
 at com.rabbitmq.client.impl.recovery.RecoveryAwareAMQConnectionFactory.newConnection(RecoveryAwareAMQConnectionFactory.java:65)
 at com.rabbitmq.client.impl.recovery.AutorecoveringConnection.init(AutorecoveringConnection.java:160)
 at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1216)
 at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1173)
 at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1131)
 at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1294)
 at Send.main(Send.java:19)

[AMQP Connection 127.0.0.1:5672] WARN com.rabbitmq.client.impl.ForgivingExceptionHandler - 

An unexpected connection driver error occurred (Exception message: Socket closed)

FAILURE: Build failed with an exception.

Check the logs at the RabbitMQ server end:

2022-06-13 07:41:48.892031+00:00 [error] <0.1804.0> Error on AMQP connection <0.1804.0> (172.17.0.1:62846 -> 172.17.0.2:5672, state: starting):
2022-06-13 07:41:48.892031+00:00 [error] <0.1804.0> PLAIN login refused: user 'guest' - invalid credentials
2022-06-13 07:41:48.898324+00:00 [info] <0.1804.0> closing AMQP connection <0.1804.0> (172.17.0.1:62846 -> 172.17.0.2:5672)

As you see that the login was refused due to invalid credentials, make sure you have provided the correct username and password. If you are using the default credentials the username and password both are guest