java - 使用 @Scheduled 和 @EnableScheduling 但给出 NoSuchBeanDefinitionException

Question

我关注了very simple examples在线在 Spring 中设置 cron 作业，但我每次都在 Tomcat 启动日志中收到此错误:

2015-05-25 00:32:58 DEBUG ScheduledAnnotationBeanPostProcessor:191 - 
Could not find default TaskScheduler bean org.springframework.beans.factory.NoSuchBeanDefinitionException: No 
qualifying bean of type [org.springframework.scheduling.TaskScheduler] is defined

2015-05-25 00:32:58 DEBUG ScheduledAnnotationBeanPostProcessor:202 - Could not    
find default ScheduledExecutorService bean
org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying    
bean of type [org.springframework.scheduling.TaskScheduler] is defined

以及用于实现 cron 的 2 个 java 类:

• @Configuration 类:

  @Configuration
  @EnableScheduling
  public class ClearTokenStoreCronEnable {    
    final static Logger log =   
    LoggerFactory.getLogger(ClearTokenStoreCronEnable.class);
    private @Autowired TokenStoreRepository tokenStoreRepository; 
  }
  

• 和 Cron 作业类:

  @Service
  public class ClearTokenStoreWorkerService {
  
      final static Logger log = LoggerFactory.getLogger(ClearTokenStoreWorkerService.class);
      private @Autowired TokenStoreRepository tokenStoreRepository;
  
      //@Scheduled(fixedDelay=5000)
      //run daily at midnight
      @Scheduled(cron = "0 0 * * * *")
      public void tokenStoreTable() {
          log.debug("tokenstore table truncated - start");
          tokenStoreRepository.deleteAll();
          log.debug("tokenstore table truncated - end");
      }
  }
  

附带说明，cron 作业在午夜运行，但它似乎在其他时间也随机运行。不确定这是错误还是我的 cron 表达式错误:@Scheduled(cron = "0 0 * * * *")

此时我主要关心的是为什么会出现 ScheduledAnnotationBeanPostProcessor 错误？它正在寻找一个 TaskScheduler 和 ScheduledExectorService。 我只需要每天触发一次。我没有做任何并发处理或我需要多个线程的地方。最终这些错误是否有害或者我需要修复它们吗？

Answer 1

根据异常信息找不到默认的TaskScheduler bean，配置应该定义TaskScheduler而不是“Executor”

@Configuration
public class AppContext extends WebMvcConfigurationSupport {
    @Bean
    public TaskScheduler taskScheduler() {
        return new ConcurrentTaskScheduler();
    }

    // Of course , you can define the Executor too
    @Bean
    public Executor taskExecutor() {
        return new SimpleAsyncTaskExecutor();
   }
}