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Quartz Scheduler
What it is
Quartz Scheduler is a free, open-source library for Java applications that run tasks at future times or recurring intervals. Triggers can use specific times or days, calendar exclusions, repeat counts, end dates, and intervals. Quartz states that it can schedule from tens to tens of thousands of jobs and supports JTA transactions and clustering. It can run embedded in an application, inside an application server or servlet container, as a standalone RMI program, or as a cluster of standalone programs. JDBCJobStore persists jobs and triggers in a relational database, while RAMJobStore keeps them in memory and loses them between executions. Built-in clustering depends on JDBCJobStore persistence. Data sources may be JDBC, application-server JNDI, or custom ConnectionProvider implementations. Downloads list Quartz 2.5.1 for Java 11 or newer with the jakarta namespace and Quartz 2.4.1 for Java 8 with javax.*. Quartz is self-hosted under Apache License 2.0. The project describes it as a scheduling library rather than a job queue, though small-scale queue use is possible.
For and against
For
- Schedules recurring and date-based triggers
- Supports clustering and JTA transactions
- Offers database or in-memory job storage
- Runs embedded or as standalone programs
- Apache License 2.0 open source
Against
- Self-hosted library rather than hosted service
- RAMJobStore does not persist between executions
- Clustering requires JDBCJobStore persistence
- Not intended as a full job queue
The verdict
Quartz Scheduler provides flexible scheduling modes, storage choices, and deployment arrangements for Java applications. Its self-hosted design and distinction from a job queue are central to evaluating it.
Who it suits
It suits Java application developers who need embedded or self-hosted scheduling for one-time or recurring tasks. Teams needing clustering should plan for database-backed JDBCJobStore persistence.
Plans and prices
Free open-source Quartz Scheduler
Java job scheduling library · Apache 2.0 licensed · downloadable from GitHub and Maven Central
Read 15 Oct 2026 · quartz-scheduler.org
Quartz Scheduler
Open source · Apache License 2.0
Read 7 Oct 2026 · quartz-scheduler.org
On the record
- Clustering behavior
- JDBC clustering provides load balancing and fail-over, with one cluster node firing each occurrence.quartz-scheduler.org · read 15 Oct 2026
- Clustering requirement
- Quartz warns that clustered machines need clocks synchronized to within about one second.quartz-scheduler.org · read 15 Oct 2026
- Community support
- The project directs users to GitHub forums, issue tracking and its source repository for help and feature requests.quartz-scheduler.org · read 15 Oct 2026
- Compatibility release
- Quartz 2.4.1 supports Java 8 and the javax namespace.quartz-scheduler.org · read 15 Oct 2026
- Configuration
- Quartz normally reads a quartz.properties file through StdSchedulerFactory, with configurable scheduler, thread-pool, listener, plug-in, RMI, job-store, data-source and clustering settings.quartz-scheduler.org · read 15 Oct 2026
- Contribution process
- Contributors use a DCO commit-signoff process, and core developer status is invite-only.quartz-scheduler.org · read 15 Oct 2026
- Distribution
- Official downloads link to GitHub releases and Maven Central artifacts for quartz and quartz-jobs.quartz-scheduler.org · read 15 Oct 2026
- Documentation depth
- The documentation site provides JavaDoc, quick start material, configuration reference, cookbook, tutorials, examples, best practices and FAQ pages.quartz-scheduler.org · read 15 Oct 2026
- Downloads
- The downloads page lists Quartz 2.5.1 for Java 11+ with the jakarta namespace and Quartz 2.4.1 for Java 8 with the javax.* namespace.quartz-scheduler.org · read 7 Oct 2026
- Enterprise features
- The scheduler includes clustering and support for JTA transactions.quartz-scheduler.org · read 15 Oct 2026
- Extensibility
- Quartz exposes builder DSL classes, listeners, plug-ins, custom JobStore implementations and configurable SPI classes.quartz-scheduler.org · read 15 Oct 2026
- GitHub popularity
- The official repository showed about 6.8 thousand stars and 2 thousand forks when accessed.github.com · read 15 Oct 2026
- Independent community concern
- A Reddit engineering discussion notes that one shared Quartz scheduler can degrade as short-running jobs and clients increase because of cluster-wide locking.reddit.com · read 15 Oct 2026
- Independent limits
- Gitnux says Java integration can be heavy and that threading and misfire behavior require careful tuning.gitnux.org · read 15 Oct 2026
- Independent praise
- Gitnux highlights cron and calendar triggers, persistent storage, clustering and separation of jobs from triggers.gitnux.org · read 15 Oct 2026
- Independent project description
- Wikipedia describes Quartz as a Java job-scheduling library used for enterprise workflows, system-management tasks and clustering.en.wikipedia.org · read 15 Oct 2026
- Independent score
- Gitnux rated Quartz Scheduler 6.4 out of 10 overall, with 6.5 for features, 6.4 for ease of use and 6.2 for value.gitnux.org · read 15 Oct 2026
- Independent score: job scheduling
- WorldMetrics rated Quartz Scheduler 7.4 out of 10 overall, with 7.5 for features, 7.5 for ease of use and 7.2 for value.worldmetrics.org · read 15 Oct 2026
