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Init Parameter value return null.  RSS feed

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In tomcat4.1, I try to set a parameter in conf/server.xml so i can get it back from jsp page. In my jsp page, I always get a null string for the parameter i set in server.xml. I search through all document to verify my server.xml. I hit dead end. Hope someone will shine some light. This is the context in my server.xml.
<Context path="/pw" docBase="pw" debug="0"
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="localhost_pw_log." suffix=".txt"
<Environment name="maxExemptions" type="java.lang.Integer"
<Parameter name="DEBUG" value="1" override="false"/>
THis is my jsp page under webapps/pw/check.jsp
<title>Check Attribute</title>
<%@ page import="*" %>
<%@ page import="javax.servlet.*" %>
ServletContext sc = getServletContext();
String creator = (String)sc.getAttribute("DEBUG");
The page and log file show "null"
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