code: protected AccessibleConfig getApplicationConfig() {
          if (cachedApplicationConfig != null) {
              return cachedApplicationConfig;
          }
          synchronized (this) {
              if (cachedApplicationConfig != null) {
                  return cachedApplicationConfig;
              }
              cachedApplicationConfig = ContainerUtil.getComponent(AccessibleConfig.class);
          }
          return cachedApplicationConfig;
      }
docs: ========