Servlet init block doesn't work with getServletContext().getRequestDispat..

Question

Hi Everyone,
I am getting null pointer exception when i have coded init method inside my servlet(inside that i am fetching init parameter passed from web,xml file) and while getting requestdispatcher from context.
if i get requestdispatcher from request then it works fine. i dont understand reason behind this behaviour.
please give your valueable comment.
find code below:
public void init(ServletConfig config) throws ServletException
enum1 = config.getInitParameterNames();
while(enum1.hasMoreElements()){
init_paramNm = (String)enum1.nextElement();
init_paramVal = config.getInitParameter(init_paramNm);
System.out.println("Name = "init_paramNm" and value = "+init_paramVal);
getting null pointer exception with this
RequestDispatcher rd = getServletContext().getRequestDispatcher("/ObjJSPtoServlet.jsp");
rd.forward(request, response);
work fine with
RequestDispatcher rd = request.getRequestDispatcher("/ObjJSPtoServlet.jsp");
rd.forward(request, response);

Answer 1

public void init(ServletConfig config)
throws ServletException
Called by the servlet container to indicate to a servlet that the servlet is being placed into service. See Servlet.init(javax.servlet.ServletConfig).
This implementation stores the ServletConfig object it receives from the servlet container for later use. When overriding this form of the method, call super.init(config). ...
[More Info|http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/GenericServlet.html#init%28javax.servlet.ServletConfig%29]