由於java的異常會導致執行緒被打斷，因此任務的異常是被任務工作執行緒捕獲的。

若需要對任務執行情異常捕獲可以這樣操作：

ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor();
ScheduledFuture<?> handle =
        scheduler.scheduleWithFixedDelay(new Runnable() {
             public void run() { 
                 throw new
 
 RuntimeException("foo");
             }
        }, 1, 10, TimeUnit.SECONDS);

// Create and Start an exception handler thread
// pass the "handle" object to the thread
// Inside the handler thread do :
....
try {
  handle.get();
} catch (ExecutionException e) {
  Exception rootException = e.getCause();
}

或者直接在任務中捕獲處理：

final Runnable someChoreRunnable = () -> {
    try {
        doChore();
    } catch ( Throwable t ) {  // Catch Throwable rather than Exception (a subclass).
        logger.error( "Caught exception in ScheduledExecutorService. StackTrace:\n" + t.getStackTrace() );
    }
};

spring通過註解的方式可以通過scheduler的setErrorHandler處理：

@EnableScheduling
@Configuration
class SchedulingConfiguration implements SchedulingConfigurer {
    private final Logger logger = LoggerFactory.getLogger(getClass());
    private final ThreadPoolTaskScheduler taskScheduler;

    SchedulingConfiguration() {
        taskScheduler = new ThreadPoolTaskScheduler();
        taskScheduler.setErrorHandler(t -> logger.error("Exception in @Scheduled task. ", t));
        taskScheduler.setThreadNamePrefix("@scheduled-");

        taskScheduler.initialize();
    }

    @Override
    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
        taskRegistrar.setScheduler(taskScheduler);
    }
}

亦是在程式碼中直接try-catch:

@Scheduled(cron = "${schedulerRate}")
public void scheduledJob() {
    try {
        businessLogicService.doBusinessLogic();
    } catch (Exception e) {
        log.error(e);
    }
}