NotificationControllerSample2

@RestController
@RequestMapping("/notifications")
public class NotificationControllerSample implements MessageListener {
  @Autowired
  private EntityManagerUtil entityManagerUtil;

  private List<String> findWatchedKeys(String applicationId, String namespace,
                                                String dataCenter) {
    List<String> watchedKeys = Lists.newArrayList();
    //do more logic, may need to load from db in some cases
    
    /**
     * Manually close the entity manager.
     */
    entityManagerUtil.closeEntityManager();
    return watchedKeys;
  }
}