问题

[ERROR] [AMQP Connection 192.168.78.128:5672] [o.s.a.rabbit.connection.CachingConnectionFactory] [1199] - Channel shutdown: connection error; protocol method: #method<connection.close>(reply-code=503, reply-text=COMMAND_INVALID - unknown exchange type 'x-delayed-message', class-id=40, method-id=10)

解决

1. 下载插件
   https://dl.bintray.com/rabbitmq/community-plugins/3.6.x/rabbitmq_delayed_message_exchange/
2. 安装插件
   将下载的插件解压，放到RabbitMQ的plugin目录下
3. 启用插件
   rabbitmq-plugins enable rabbitmq_delayed_message_exchange