find context root of other web module in same application

Hi,

We have a application which has got multiple web modules in the same EAR file. The control by default goes to one of the web module. Now I have to invoke a resource which is in different web module. Currently I am getting the servlet context of the web module by specifying the context root and getting the request dispatcher for the web module.
But the context roots are changed by developers and would not like to hard code the values. Is there any other way to do invoke resource of different web module.

to find the context root of web module
final String context = getServlet().getServletConfig().getServletContext().getRealPath("/");