使用maven的tomcat7插件启动项目时出现上面的错误：A child container failed during start，
出现这个问题的原因是导入了servlet-api包，与tomcat7的依赖包servlet-api冲突
检查pom.xml是否导入servlet-api
加上
<scope>provided</scope>
之后再次运行，成功启动
IDEA maven使用tomcat7插件启动报错:A child container failed during start
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