How to define/retrieve an application specific parameter in an J2EE application

I would like to define a application specific variable.  When the application start up, I can load it into some context variable.  Then, some java bean can access these context and do something with the defined variable.  Is there any way to do it?
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>define a application specific variable.  
You could define one in your web app's web.xml ;
On a JSP, you could access with
String name = application.getInitParameter("name");
>Then, some java bean can access these context and do something with the defined variable  
(I think you are talking about a javabean here,not a EJB. Please confirm.)
That will take some more work. Please read jim's solution and my assisted solution at   

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You can edit your server startup script and in the line when you start the server you can add -D params. -Dkey="Value". Inside your webapp or services or Jsp's you can get the parameter by System.getProperty("key")
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Java EE

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