🔹 What is Quartz?
Quartz is a powerful, open-source job scheduling library. It lets you schedule tasks (jobs) to run:
- At a fixed interval
- At a specific time
- Using cron expressions
🔹 Add Quartz Dependency
In a Spring Boot (Maven) project, include:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-quartz</artifactId>
</dependency>
🔹 Define a Quartz Job
Quartz jobs implement the Job interface.
package com.example.demo.jobs;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SampleJob implements Job {
private static final Logger logger = LoggerFactory.getLogger(SampleJob.class);
@Override
public void execute(JobExecutionContext context) {
logger.info("✅ SampleJob is running at {}", context.getFireTime());
}
}
🔹 Configure Quartz Scheduler
You can define job details and triggers in a @Configuration class.
package com.example.demo.config;
import com.example.demo.jobs.SampleJob;
import org.quartz.*;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class QuartzConfig {
// Define the job
@Bean
public JobDetail sampleJobDetail() {
return JobBuilder.newJob(SampleJob.class)
.withIdentity("sampleJob")
.storeDurably()
.build();
}
// Define the trigger (run every 10 seconds)
@Bean
public Trigger sampleJobTrigger(JobDetail sampleJobDetail) {
return TriggerBuilder.newTrigger()
.forJob(sampleJobDetail)
.withIdentity("sampleTrigger")
.withSchedule(SimpleScheduleBuilder.simpleSchedule()
.withIntervalInSeconds(10)
.repeatForever())
.build();
}
}
🔹 Application Properties (Optional)
If you want Quartz to use a database instead of in-memory, you can configure:
spring.quartz.job-store-type=jdbc
spring.quartz.jdbc.initialize-schema=always
(Default is in-memory job store, fine for small apps.)
🔹 Run the App
When you run the Spring Boot app, you should see logs like:
✅ SampleJob is running at 2025-08-21T10:00:00
✅ SampleJob is running at 2025-08-21T10:00:10
✅ SampleJob is running at 2025-08-21T10:00:20
🔹 Example with CRON Expression
You can swap the trigger for a cron schedule:
@Bean
public Trigger sampleJobTrigger(JobDetail sampleJobDetail) {
return TriggerBuilder.newTrigger()
.forJob(sampleJobDetail)
.withIdentity("sampleCronTrigger")
.withSchedule(CronScheduleBuilder.cronSchedule("0/30 * * * * ?")) // every 30 seconds
.build();
}