Java EE (Java Enterprise Edition) General Discussion

I have the following code:

// part of the doPost(...) section of a servlet
       response.sendRedirect("someurl");
	RequestDispatcher view = servletContext.getRequestDispatcher("/someFile.jsp");
	view.forward(request, response);

I would like the browser to redirect, but if for some reason the browser doesn't redirect should display a page indicating where the user should go. However, trying the above code does not work and gives me an exception:

java.lang.IllegalStateException: Cannot forward after response has been committed

1. Any idea's on how I can achieve this?

2. Is there any chance at all that the redirect might not happen on the browser end?