web应用中webapp. root重用问题解决方案
?
同一个tomcat服务器里面部署两个JavaEE项目，都是用了log4j做日志。并且web.xml里面都监听了日志信息。
启动服务的时候报错。
于是在web.xml添加以下代码：
?
<display-name>myapp002</display-name><context-param> <param-name>webAppRootKey</param-name> <param-value>myapp002.root</param-value></context-param>?
?
?
tomcat6中部署了两个web应用，都采用的是struts2+spring+hibernate框架，记录日志都用了log4j,结果webroot.app被重用了，启动tomcat时，出现错误，部分
错误信息如下:
严重: Exception sending context initialized event to listener instance of class?
org.springframework.web.util.Log4jConfigListener
java.lang.IllegalStateException: Web app root system property already?
set to different value: 'webapp.root' = [D:\Program Files\tomcat6
\webapps\abc\] instead of [D:\Program Files\tomcat6\webapps\abc\]?
- Choose unique values for the 'webAppRootKey' context-param in your?
web.xml files!
?
?
?
At the end there are three possible solutions for the initial problem:?
(1) Provide any of your applications with a unique 'webAppRootKey'.?
(2)?Set?the servlet context parameter 'log4jExposeWebAppRoot' to ??
'false'. This eliminates the use of log file locations relative to ??
the?web?application's?root?directory but still allows a log4j config ??
location outside the classpath.?
(3) Remove the 'Log4jConfigListener' from your application's?web.xml.?
?
