docs: @Trivial  //trace is manually added.
      @Override
      public void notificationCreated(RuntimeUpdateManager updateManager, RuntimeUpdateNotification notification) {
          final boolean trace = TraceComponent.isAnyTracingEnabled();
          if (trace && tc.isEntryEnabled())
              Tr.entry(this, tc, "notificationCreated", notification.getName());
              
          if (configChecked) {
              if (trace && tc.isEntryEnabled())
                  Tr.exit(this, tc, "notificationCreated: early return.", notification.getName());
              return;
          }
  
          if (!configChecked && RuntimeUpdateNotification.APPLICATIONS_STARTING.equals(notification.getName())) {
              configChecked = true;
              
              try {
                  String sessionCacheConfigFilter = FilterUtils.createPropertyFilter(Constants.SERVICE_PID, "com.ibm.ws.session.cache");
  
                  Configuration[] sessionCacheConfigurations = configAdmin.listConfigurations(sessionCacheConfigFilter);
                  
                  if (sessionCacheConfigurations.length != 1) {
                      if (trace && tc.isDebugEnabled())
                          Tr.debug(this, tc, "There should always be one exactly one sessionCacheConfiguration. "
                                          + "Number of sessionCacheConfigurations found = " + sessionCacheConfigurations.length);
                  }
                  
                  if (sessionCacheConfigurations != null) {
                      for (Configuration configuration : sessionCacheConfigurations) {
                          if (configuration == null) {
                              continue;
                          }
  
                          Dictionary<String, Object> props = configuration.getProperties();
                          String[] libraryRefs = (String[]) props.get("libraryRef");
  
                          if (libraryRefs == null) {               
                              if (!isSessionCacheBellConfigured()) {
                                  Tr.error(tc, "ERROR_CONFIG_INVALID_HTTPSESSIONCACHE", Tr.formatMessage(tc, "SESSION_CACHE_CONFIG_MESSAGE", sampleConfig));
                              }
                          } else if (libraryRefs.length == 0) {
                              Tr.debug(tc, "The libraryRef attribute of the httpSessionCache in the server configuration could not be resolved. "
                                              + "Check for possible CWWKG0033W messages.");
                          } else {
                              //verify that the libraryRef points to a valid library configuration object.
                              Configuration libraryConfiguration = configAdmin.getConfiguration(libraryRefs[0]);
                              if(libraryConfiguration != null) {
                                  //We found nothing wrong with the configuration.
                                  if (trace && tc.isDebugEnabled())
                                      Tr.debug(this, tc, "A httpSessionCache configuration with a valid libraryRef was found.");
                              } else {
                                  //This case should not be possible. 
                                  //If the libraryRef is missing then libraryRefs is null.
                                  //If the libraryRef points to an invalid library, libraryRefs length is 0.
                                  //If there is more than one libraryRef, a CWWKG0014E error will have already been thrown.
                                  if (trace && tc.isDebugEnabled())
                                      Tr.debug(this, tc, "A httpSessionCache configuration with a valid libraryRef was found, "
                                                      + "but the configuration the libraryRef points to is null. "
                                                      + "This should never happen.");
                              }
                          }
                      }
                  }
              } catch ( InvalidSyntaxException | IOException ex) {
                  //Something unexpected happened, log the exception as an error.
                  Tr.error(tc, "ERROR_SESSION_INIT", ex);
              }
          }
          
          if (trace && tc.isEntryEnabled())
              Tr.exit(this, tc, "notificationCreated", notification.getName());
      }