Scheduling jobs with Quartz

Quartz is a Java library that can schdule tasks (using Job derived class).  Let me show how you would use the scheduler.  First, import the library.

        <dependency>
            <groupId>org.quartz-scheduler</groupId>
            <artifactId>quartz</artifactId>
            <version>2.3.0</version>
        </dependency>
        <dependency>
            <groupId>org.quartz-scheduler</groupId>
            <artifactId>quartz-jobs</artifactId>
            <version>2.3.0</version>
        </dependency>

The task that the scheduler runs must be a Job class derivative.

import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

public class NewsJob implements Job {
    
    @Override
    public void execute(JobExecutionContext context) throws JobExecutionException {
        try {
            String keyword = (String) context.getJobDetail().getJobDataMap().get("keyword");
            System.out.println(keyword);
            
            // task         

        } catch (Exception e) {
            // emit an error
        }
    }
}

How you schedule:

    public void cronJob(String keyword) {
        try {
            JobDetail job = JobBuilder.newJob(NewsJob.class).usingJobData("keyword", keyword)
                    .withIdentity("trigger", "group").build();

            Trigger trigger = TriggerBuilder.newTrigger().withIdentity("trigger", "group").startNow()
                    .withSchedule(
                            SimpleScheduleBuilder.simpleSchedule().withIntervalInMilliseconds(1000*60*60).repeatForever())
                    .build();

            Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();
            scheduler.scheduleJob(job, trigger);
            scheduler.start();

        } catch (Exception e) {
            // emit an error
        }
    }

Here the keyword value is set and the task is getting the value by calling context.getJobDetail().getJobDataMap().get().