How to access Cron expression from application.properties file

Question

This is my job schedule part and I want to remove the cron trigger, CronTrigger("0 40 13 * * ?") then access the cron expression from application.properties.

@Component
public class DynamicjobSchedule  {

    public void schedulejobs() {

        for (ConnectionStrings obj : listObj) {
            System.out.println("Cron Trigger Starting..");
            scheduler.schedule(new DashboardTask(obj), new CronTrigger("0 40 13 * * ?"));
        }
    }
}

How can I create one property file in src/main/resources location and mention the cron expression then call from the scheduler?

Answer 1

The simplest way is to use @Value annotation like this:

@Component
public class DynamicjobSchedule {

    @Value("${name.of.cron.expression.in.application.properties}")
    private String cronExpression;

    public void schedulejobs() {

        for (ConnectionStrings obj : listObj) {
            System.out.println("Cron Trigger Starting..");
            scheduler.schedule(new DashboardTask(obj), new CronTrigger(cronExpression));
        }
    }
}

You can use the @Value annotation on method parameter too:

@Component
public class DynamicjobSchedule {

    public void schedulejobs(@Value("${name.of.cron.expression.in.application.properties}") String cronExpression) {

        for (ConnectionStrings obj : listObj) {
            System.out.println("Cron Trigger Starting..");
            scheduler.schedule(new DashboardTask(obj), new CronTrigger(cronExpression));
        }
    }
}