问题：

 springbppt有两个模块，mail和server，启动mail的时候报错：

1 Description:
2 
3 The bean 'queue', defined in com.hyf.MailAppAplication, could not be registered. A bean with that name has already been defined in class path resource [com/hyf/server/conf/RabbitMQConfig.class] and overriding is disabled.
4 
5 Action:
6 
7 Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true

可以看到是因为server模块里面已经注册了一个queue的bean了，所以mail里面再注册会提示已存在。

解决：

根据提示，在mail的配置文件里面加入   spring.main.allow-bean-definition-overriding=true  这个配置就行了。

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