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How to write cron jobs in Java EE?
Could you explain with an example?
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What does * mean in Cron? The asterisk * is used as a wildcard in Cron. * sets the execution of a task to any minute, hour, day, weekday, or month.
Java Cron ExpressionThe @Scheduled annotation is used to trigger the scheduler for a specific time period. The following screenshot shows how the application has started at 09:03:23 and for every one minute from that time the cron job scheduler task has executed.
To check on your cron jobs manually, log into each server separately and look in its syslog files. Or, find a way to aggregate the syslog files from across your data center, then identify which cron entries in the aggregated logs correspond to which servers.
A Cron is a time-based job scheduler. It enables our application to schedule a job to run automatically at a certain time or date. A Job (also known as a Task) is any module that you wish to run.
If you're not limited to j2ee and have the option to use JavaEE 6, please see SIMPLEST POSSIBLE EJB 3.1 TIMER.
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