Why req.getRequestDispatcher().forward(req, resp) bring up blank page?

Dear experts,
I have a web application which use MVC pattern. My login.jsp submit to ControllerServlet, which then dispatch the page to entry.jsp. But, the dispatch does not work properly that it opens a blank page.
req.getRequestDispatcher(entry.jsp).forward(req, resp)
even the entry.jsp does exist. I tried with even just a simple HTML page, it will not open properly. However, the same codes works between the other jsp pages, that if I start with other jsp instead of login.jsp, the dispatch works.
Any clue? thanks.

Hi,
Tru using
req.getRequestDispatcher("/entry.jsp").forward(req, resp)
If the path begins with a "/" it is interpreted as relative to the current context root else
path is relative to the current HTTP request.
-Amol

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Why req.getRequestDispatcher().forward(req, resp) bring up blank page?

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