Using Variable in Web.xml/ Override value in web.xml

Environment : JBOSS 4.2 / Web application in java/jsp
*==============================================================*
Iam using a servelet in application, and paremeters is configured in web.xml at run time I need to change the value. A variable
see web.xml
{color:#ff0000}<param-value>C:/FILE_ATTACHMENTS{color}</param-value>
Instead of using a static folder name I need to use a variable, this veriable either i define in config.properties or ineed to pass through application
Web.Xml file
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="[http://java.sun.com/xml/ns/j2ee]" xmlns:xsi="[http://www.w3.org/2001/XMLSchema-instance]" xsi:schemaLocation="[http://java.sun.com/xml/ns/j2ee] [http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd]">
<display-name>VyasaWeb</display-name>
<servlet>
<servlet-name>VyasaServlet</servlet-name>
<servlet-class>com.jsos.download.VyasaServlet</servlet-class>
<init-param>
<param-name>dir</param-name>
param-value>C:/FILE_ATTACHMENTS</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>VyasaServlet</servlet-name>
<url-pattern>/servlet/VyasaServlet</url-pattern>
</servlet-mapping>
</web-app>
Is any way to use variable in web.xml or override the value ?
Please help
Vince
Edited by: VINCEJOHNSON on Jul 30, 2010 3:30 PM

If nothing else, why not just have your servlet load a configuration file on startup?

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