CronTask(runnable: Runnable, expression: String)
Create a new CronTask.
runnable - the underlying task to execute
expression - the cron expression defining when the task should be executed
CronTask(runnable: Runnable, cronTrigger: CronTrigger)
Create a new CronTask.
runnable - the underlying task to execute
cronTrigger - the cron trigger defining when the task should be executed