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

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

tomcat或jetty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>