Java.lang.NullPointerException when calling getServletContext

Hi All,
When calling getServletContext from my servlet, i'm getting the following exception to my web client:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
     javax.servlet.GenericServlet.getServletContext(GenericServlet.java:159)
     amdocs.checklist.UserPage.service(UserPage.java:126)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     amdocs.checklist.LoginFilter.doFilter(LoginFilter.java:65)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.27 logs.
My code is:
ServletContext sc = getServletContext();
RequestDispatcher rd = getServletContext().getRequestDispatcher("/Header");
rd.include(request, response);
It couldn't pass the call of getServletContext, Any idea why?
Thanks.

I haven't looked at the source yet, but I remember the api specs talking about the init(ServletConfig) method being called by the container.
The servlet will the set up it's references to objects (eg. the ServletContext) and calls the init() method.
So, if you override the init(ServletConfig) method the references will never be set up, and you will get null calling getServletContext().
So always use the init() method for any initialization of servlets.

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