Access custom variable value in web.xml context-param?

My requirement or need is to access a variable value either in a class in my Model project or a backing bean in my View project. For example, one variable I need to access is an application server I am integrating with - 'testserver' or 'productionserver' - I want to be able to configure this within an external file so that I do not have to re-compile my application to change the variable.
I was thinking about placing this variable in the web.xml <context-param> section as:
<context-param>
<param-name>servername</param-name>
<param-value>testserver</param-value>
</context-param>
I need to access this value within a class (not a servlet) on an Application Module service method, though if needed, I could access it from a backing bean and pass it to the service method (less desirable.) Is this a good approach and how do access this variable from within a Java class including any imports I need to do (code example)?
Thanks and Happy New Year!
Hopefully most everyone is out spending time with friends and family versus stuck trying to complete a project like me...

I found an example from SRDemo that provides what I was looking for:
String serverhostaddress =
FacesContext.getCurrentInstance().getExternalContext().getInitParameter("param-name-var-in-webxml");

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Hey :-)
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Nothing seems to work, have change the string and rewritten the web.xml file to:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
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Variable values in composite.xml property

Hi, i've got the similar proble to: variable values in composite.xml property
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<property name="oracle.webservices.auth.password" type="xs:string"
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Reward the helpful answers and close the thread once its answered.
sorry for the delay in answering, it was weekend for us

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Environment : JBOSS 4.2 / Web application in java/jsp
*==============================================================*
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see web.xml
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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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Can also refer to link below:-
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/b0a89464-f697-2910-2ba6-9877e3088954?quicklink=index&overridelayout=true(can refer to page 20)
http://www.sdn.sap.com/ddc5564a-337d-4cf9-a34e-2dab64df09be/finaldownload/downloadid-a61a6724ba8e7b7fbd9c5df9590ab50d/ddc5564a-337d-4cf9-a34e-2dab64df09be/irj/scn/go/portal/prtroot/docs/library/uuid/f0881371-78a1-2910-f0b8-af3e184929be?quicklink=index&overridelayout=true
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Therefore I am trying a function or method in order to pass the variable value (pop-up variable).
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Access custom variable value in web.xml context-param?

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