> getServletConfig().getServletContext()
> .getServlet("bookstore.BookDBServlet");
The method ServletContext.getServlet(String) is deprecated since version
2.1. In the spec it is stated, that servlet engines should always return
null.

Instead (for forwarding to this servlet), use the RequestDispatcher:
getServletConfig().getServletContext()
.getRequestDispatcher("bookstore.BookDBServlet")
.forward(request, response);

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