How to fix sudden failure of Spring timed task annotations

If the Spring scheduled task annotation suddenly stops working, it may be due to the following reasons:

1. The scheduled task class has not been scanned by the Spring container. Check if the class containing the scheduled task is annotated with @Component or @Service to ensure that Spring can scan and manage the class.
2. The scheduled task method is not properly annotated. Check if the scheduled task method is decorated with @Scheduled annotation, and ensure that the cron expression, fixedRate, or fixedDelay parameters in the annotation are correctly configured.
3. The configuration for Spring scheduled tasks has been disabled. Check the project’s configuration files, such as application.properties or application.yml, to ensure that the scheduled tasks configuration option spring.task.scheduling.enabled is not set to false.
4. The thread pool for scheduled tasks has been shut down. If the execution of scheduled tasks depends on the thread pool, ensure that the thread pool is properly configured and has not been closed.

If the above solutions still cannot fix the issue, you can try restarting the application or investigating other possible reasons for the failure of scheduled tasks, such as updating dependencies or changing system time. If the problem persists, consider checking the log files for more detailed error information and further troubleshooting and fixing based on that information.