code: private void injectFreemarkerTags() {
          if(!tagsInjected){
              AbstractFreeMarkerConfig freeMarkerConfig = Configuration.getFreeMarkerConfig();
  
              Injector injector = Configuration.getInjector();
              tagsInjected = true;
              if(injector == null || freeMarkerConfig == null){
                  return;
              }
              freeMarkerConfig.inject(injector);
          }
      }
docs: Injects FreeMarker tags with dependencies from Guice module.