如何调试@Scheduled spring boot 方法或服务方法？

Question

I've an existing spring boot application and now I need to debug some methods. Therefore these methods are @Scheduled or in service classes they are invoked automatically by the app.

Is there any option to invoke these methods via debugging? Or are there any other ways to do that without changing the source code? I could add an ApplicationRunner or CommandLineRunner but then I need to change the App sources.

Thanks

Answer 1

You can externalize the value for the @Scheduled annotation using SpEL. You still need to change the code but afterwards it's configurable and you can change the cron without changing the code. That way you can start it with a different cron for debugging too.

An alternative if you aren't able to change the code is to use remote debugging but you would need to restart the app for that and add the arguments mentioned in this documentation .

But that way it may take a lot of time for scheduled methods to get invoked depending on the cron or interval.