[Java] Schedule tasks with Quartz and Spring

We saw how to schedule tasks with ScheduledExecutorService, and we now we will see how to achieve the same result using the Quartz framework.

Much like before, we have two key concepts:

• job: a job is a runnable class that implements the Job interface
• trigger: a Trigger is a specific schedule for a job. A trigger can only be linked to a job, and a job can be linked to multiple triggers.

You can find Quartz on Maven.

[Java] Schedule tasks with ScheduledExecutorService

Java offers a ScheduledExecutorService that allows developers to create and schedule tasks.

A task is a class that implements ONE method to be executed that performs the desired duties. It is NOT necessary for the task itself to implement the Runnable interface, although the tasks will be run as a Thread.

An important thing to notice is that by default threads are NOT marked as daemons, therefore it might be worth setting such flag according to your needs.

Another important thing to note, is that the scheduler will hold on to references to cancelled tasks, which might lead to memory leaks, so it might be preferable to setRemoveOnCancelPolicy to true.