docs: public void addExternalCacheAdapter(String groupId, String address, String beanName) throws DynamicCacheServiceNotStarted {
      	if (servletCacheUnit == null) {
      		throw new DynamicCacheServiceNotStarted("Servlet cache service has not been started."); 
      	}
      	servletCacheUnit.addExternalCacheAdapter(groupId, address, beanName);
      }