docs: private void processServletConfig(DeploymentDescriptor webDD, Servlet servlet) {
          String servletName = servlet.getServletName();
          Map<String, ConfigItem<ServletConfig>> servletMap = configurator.getConfigItemMap("servlet");
          ConfigItem<ServletConfig> existedServlet = servletMap.get(servletName);
  
          ServletConfig servletConfig = null;
          if (existedServlet == null) {
              String servletId = webDD.getIdForComponent(servlet);
              if (servletId == null) {
                  servletId = "ServletGeneratedId" + configurator.generateUniqueId();
              }
              servletConfig = webAppConfiguration.createServletConfig(servletId, servletName);
  
              configureTargetConfig(servletConfig, servlet.getServletClass(), "Servlet", servlet);
  
              String jspFile = servlet.getJSPFile();
              if (jspFile != null) {
                  servletConfig.setIsJsp(true);
                  servletConfig.setFileName(jspFile);
              }
              if (servlet.isSetEnabled()) {
                  servletConfig.setEnabled(servlet.isEnabled());
              }
  
              webAppConfiguration.addServletInfo(servletName, servletConfig);
  
              servletMap.put(servletName, createConfigItem(servletConfig));
  
          } else {
              servletConfig = existedServlet.getValue();
          }
  
          configureInitParams(servletConfig, servlet.getInitParams(), "servlet");
  
          if (servlet.isSetLoadOnStartup()) {
              Map<String, ConfigItem<Integer>> servletLoadOnStartupMap = configurator.getConfigItemMap("servlet.load-on-startup");
  
              ConfigItem<Integer> existedLoadOnStartup = servletLoadOnStartupMap.get(servletName);
  
              if (existedLoadOnStartup == null) {
                  servletConfig.setStartUpWeight(servlet.isNullLoadOnStartup() ? null : Integer.valueOf(servlet.getLoadOnStartup()));
                  servletLoadOnStartupMap.put(servletName, createConfigItem(Integer.valueOf(servlet.getLoadOnStartup())));
              } else {
                  validateDuplicateConfiguration("servlet", "load-on-startup", servlet.isNullLoadOnStartup() ? null : Integer.valueOf(servlet.getLoadOnStartup()),
                                                 existedLoadOnStartup);
              }
          }
  
          if (servlet.getMultipartConfig() != null) {
              Map<String, ConfigItem<MultipartConfig>> servletMultipartConfigMap = configurator.getConfigItemMap("servlet.multipart-config");
              if (existedServlet == null || !servletMultipartConfigMap.containsKey(servletName)) {
                  servletConfig.setMultipartConfig(createMultipartConfigElement(servlet.getMultipartConfig()));
                  servletMultipartConfigMap.put(servletName, createConfigItem(servlet.getMultipartConfig()));
              } else {
                  ConfigItem<MultipartConfig> existedMultipartConfig = servletMultipartConfigMap.get(servletName);
                  if (existedMultipartConfig.getSource() == ConfigSource.WEB_FRAGMENT && configurator.getConfigSource() == ConfigSource.WEB_FRAGMENT) {
                      if (!isSameMultipartConfigs(existedMultipartConfig.getValue(), servlet.getMultipartConfig())) {
                          // TODO: What goes here?
                      }
                  } else if (existedMultipartConfig.getSource() == ConfigSource.WEB_XML && configurator.getConfigSource() == ConfigSource.WEB_FRAGMENT) {
                      if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
                          Tr.debug(tc, "multipart-config for servlet {0} is configured in web.xml, the value from web-fragment.xml in {1}  is ignored", servletName,
                                   configurator.getLibraryURI());
                      }
                  }
              }
          }
  
          if (servlet.isSetAsyncSupported()) {
              configureAsyncSupported(servletConfig, servlet.isAsyncSupported(), "servlet");
          }
          com.ibm.ws.javaee.dd.common.RunAs runAs = servlet.getRunAs();
          if (runAs != null) {
              servletConfig.setRunAsRole(runAs.getRoleName());
          }
      }