以war包形式部署应用到tomcat服务器会遇到重复部署的问题，在官方文档有明确的提示，先看下原文：

If you want to deploy a WAR file or a directory using a context path that is not related to the base file name then one of the following options must be used to prevent double-deployment:

• Disable autoDeploy and deployOnStartup and define all Contexts in server.xml
• Locate the WAR and/or directory outside of the Host's appBase and use a context.xml file with a docBase attribute to define it.

意思很明白，就是以war包部署，又想定义不一样的context path，如果不遵守下面两个原则就会引起重复部署，解决方案翻译过来就是：

1、在host标签下设置属性autoDeploy=false和deployOnStartup=false，同时所有context设置在server.xml里
2、war文件放到根目录appBase之外的地方