Open source job schedulers

Here we have prepared a list of interesting job schedulers that are available. We had the opportunity to try JobRunr and used db-scheduler on one of our projects.

1. Quartz Scheduler:
   • Description: Quartz is a powerful and widely-used job scheduling library for Java. It supports complex scheduling, job persistence, clustering, and transactional behavior.
   • Features: Flexible scheduling, persistent job storage, clustering support, and integration with various databases.
   • GitHub: Quartz Scheduler
2. JobRunr:
   • Description: JobRunr is a modern, open-source job scheduling library for Java that uses the database for persistence. It is designed to be simple and developer-friendly.
   • Features: Persistent job storage, distributed execution, retries, and built-in dashboard for monitoring.
   • GitHub: JobRunr
3. db-scheduler:
   • Description: A lightweight, persistent job scheduling library for Java that uses your database for job storage and management.
   • Features: Simple API for job scheduling, supports various SQL databases (MySQL, PostgreSQL, Oracle, etc.), persistent job storage with transactional guarantees, cron-like scheduling, handles retries and failures.
   • GitHub: db-scheduler
4. ShedLock:
   • Description: ShedLock ensures that your scheduled tasks execute at most once at the same time, even in a distributed environment. It integrates well with Spring.
   • Features: Distributed locks using the database, Spring integration, and supports multiple databases like MongoDB, MySQL, and PostgreSQL.
   • GitHub: ShedLock
5. Easy Batch:
   • Description: Easy Batch is a lightweight batch processing framework that makes it easy to process large volumes of data.
   • Features: Declarative job definition, built-in job persistence, and easy integration with databases.
   • GitHub: Easy Batch
6. Elastic-Job:
   • Description: Elastic-Job is a distributed job scheduling framework for Java. It provides flexible job scheduling and execution, with job persistence in databases.
   • Features: Distributed scheduling, fault-tolerant, sharding, and job persistence.
   • GitHub: Elastic-Job
7. EJavaCron:
   • Description: EJavaCron is a simple and lightweight Java library for scheduling tasks using cron expressions.
   • Features: Cron-based scheduling, lightweight, and easy to integrate.
   • GitHub: EJavaCron
8. OpenSymphony Quartz:
   • Description: Another variation of Quartz Scheduler maintained by the OpenSymphony community.
   • Features: Similar to Quartz Scheduler with flexible job scheduling and persistent storage.
   • GitHub: OpenSymphony Quartz

These libraries and frameworks should provide a good starting point for implementing job scheduling in your Java applications, with varying degrees of complexity and features to suit your needs.