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>myapp001</display-name>

	<context-param>
	    <param-name>webAppRootKey</param-name>
	    <param-value>myapp001.root</param-value>
	</context-param>

 

 

<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.