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

java.lang.IllegalStateException: Web app root system property already set to different value: ‘webapp.root’ = XXX

tomcat或jetty内两个项目同时启动就报错,单个正常.

据查询因为Log4j中${webapp.root}变量冲突导致

解决办法为在web.xml中添加配置:

<context-param>

<param-name>webAppRootKey</param-name>

<param-value>项目名.root</param-value>

</context-param>