Quartz scheduler implementation using JobStore with PostgreSQL.

First of all, you may need to be running a PostgreSQL instance, that is out of the scope of this article. As an alternative, you can run PostgreSQL in a container using Docker.

After PostgreSQL is running and accessible, set connections params in application.yml.

spring:
  datasource:
    driver: org.postgresql.Driver
    url: jdbc:postgresql://<ip-address>:<port>/<db-name>
    username: <db-user>
    password: <db-pass>

Run the app:

$ ./mvnw spring-boot:run

$ curl -X POST \
    'http://localhost:8080/job' \
    -H 'content-type: application/json' \
    -d '{
  	"jobName": "JobTest",
  	"jobGroup": "JobGroup",
  	"cronExpression": "0/2 * * ? * *",
  	"payload": "Testing scheduler job"
  }'

This job will be fired every 2 seconds.

Cron expression could be done using Cron Expression Generator & Explainer - Quartz.

$ curl -X DELETE \
    'http://localhost:8080/job?jobName=JobTest&jobGroup=JobGroup'