how to get an init-param from web.xml

[Randy Paries]

hello,
I my web.xml i have the following:
<servlet>
  <servlet-name>AppServlet</servlet-name>
     <servlet-class>
           org.restlet.ext.servlet.ServerServlet
     </servlet-class>
     <init-param>
         <param-name>defaultGatewayID</param-name>
         <param-value>1</param-value>
     </init-param>
</servlet>

my question is how to i get the value of defaultGatewayID?

The second part of this question. My resources will need this value. What is 
the correct way for my resources access this from value (defaultGatewayID) from 
the Application

Thanks for any help

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