Spring Scheduler Made Simple: A Guide for Junior Devs

When I was starting out, I once wrote a background loop with Thread.sleep() just to send a reminder at fixed times. It worked, but barely.

Spring Boot has a much cleaner way: Spring Scheduler.
With just an annotation or two, you can:

• Run tasks every few seconds.
• Delay tasks until the last one finishes.
• Schedule jobs with cron expressions.

In this post, I’ll walk through:

• How to enable scheduling in Spring Boot.
• The difference between fixedRate, fixedDelay, and cron.
• Why a thread pool matters.
• Common mistakes (like tasks silently stopping).

A demo project you can clone and run.

👉 Full article here: Spring Scheduler Made Simple