request.getRequestDispatcher doesnt work with servlet module

[Jignesh Vachhani，修改在7 年前。]

Hi Friends,

Below both the statements are not working in Liferay servlet osgi module.

request.getRequestDispatcher("/detail.jsp").forward(request, response);

OR

RequestDispatcher requestDispatcher =_servletContext.getRequestDispatcher("/detail.jsp");
requestDispatcher.forward(request, response);

It gives NUll Pointer exception.
Any clue why ?