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If the GetServletContext method is returning null in a HttpServlet subclass, it likely means that the servlet has not been initialized properly. Here are a few steps to handle this issue:

1. Check for any errors in the servlet initialization code. Make sure that all necessary resources are being loaded correctly and that any required configurations are in place.

2. Check that the web.xml file is correctly configured. Some servlet containers require a specific configuration of web.xml in order to perform the proper initialization.

3. Verify that the servlet container is correctly configured and running. Check the server logs for any error messages or warnings that may be related to the servlet initialization.

4. Try accessing the servlet context through a different method, such as the ServletConfig object or the ServletContextListener interface. This may help identify whether the issue is related specifically to the GetServletContext method.

5. Consider seeking help from the servlet container vendor or community forums. They may have encountered similar issues and be able to provide guidance on how to resolve them.