最近在整合RabbitMQ时spring报错
Caused by: org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: A 'connection-factory' attribute must be set.
Offending resource: ServletContext resource [/WEB-INF/spring/rabbitmq/config.xml]
从报错中可以看下，是某个bean缺少connection-factory的属性，仔细对比后发现是此处问题：
<rabbit:template exchange="messageExchange" id="rabbitTemplate" />
改后：
<rabbit:template exchange="messageExchange" id="rabbitTemplate" connection-factory="connectionFactory"/>
很傻的错误，太疏忽了，template一定要注意连接属性注入。
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