java variable for tomcat document root?

is there a java variable or method that can return tomcat's document root?
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that's an environment variable
alskdj80Author Commented:
hmm, how would i get that variable in a servlet?
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Try this. But, I hope someone has an easier way.
String path = getServletContext().getRealPath("/");
String tomcat =  path.substring(0,path.lastIndexOf(request.getContextPath()));    
I'm not sure whether you are looking for this or not.

  String realPath = application.getRealPath("some.jsp");
Or is it ?
String path = getServletContext().getRealPath("/");
String tomcat =  path.substring(0,path.lastIndexOf("/webapps"));    

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this works for me:

String temp = System.getProperty("tomcat.home");
Yes, bobbit's code is easier.
alskdj80Author Commented:
hmm, tomcat.home returns null for me...
but getServletContext().getRealPath("/"); return exactly what i wanted
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