Why did the attempt to directly access the 'rctxt' field from a JettyJspServlet instance fail, and how did the article work around it?

The `rctxt` field is a private member of the parent class `JspServlet`, not inherited by `JettyJspServlet`. To access it, you must use `getSuperclass().getDeclaredField("rctxt")` on the instance, as shown in the article's step-by-step reflection chain.