docs: public void loadServlet(String servletName) throws ServletException, SecurityException {
          SecurityManager sm = System.getSecurityManager();
          if (sm != null) {
              sm.checkPermission(perm);
          }
  
          ServletWrapper s;
  
          try {
              s = (ServletWrapper) getServletWrapper(servletName);
              if (s != null) {
                  s.load();
              }
          } catch (Exception e) {
              throw new ServletException("Servlet load failed: " + e.getMessage());
          }
      }