java.lang.IllegalStateException: Web app root system property already set to different value: 'webap

報錯為:

java.lang.IllegalStateException: Web app root system property already set to different value: 'webapp.root' = [G:\apache-tomcat-8.0.53-wupu\webapps\ewp_gisTools_data3\] instead of [G:\apache-tomcat-8.0.53-wupu\webapps\pollution_permission_system\] - Choose unique values for the 'webAppRootKey' context-param in your web.xml files!

tomcat内兩個項目同時啟動就報錯,單個正常.

據查詢因為Log4j中${webapp.root}變量沖突導緻

解決辦法為在web.xml中添加配置:

<context-param>  
    <param-name>webAppRootKey</param-name>  
    <param-value>項目名.root</param-value>  
</context-param