---
title: "Crons"
description: "Sentry Crons allows you to monitor the uptime and performance of any scheduled, recurring job in your application."
url: https://docs.sentry.io/platforms/java/guides/spring-boot/crons/
---

# Set Up Crons | Sentry for Spring Boot

Once implemented, it'll allow you to get alerts and metrics to help you solve errors, detect timeouts, and prevent disruptions to your service.

## [Requirements](https://docs.sentry.io/platforms/java/guides/spring-boot/crons.md#requirements)

* Use our [getting started](https://docs.sentry.io/platforms/java/guides/spring-boot.md) guide to install and configure the Sentry Java SDK (min 6.30.0) for your recurring job.

- Ensure that `org.aspectj.aspectjweaver` is present as a dependency of your project.

* [Create and configure](https://sentry.io/issues/alerts/new/crons/) your first Monitor.

If you are using [Quartz](http://www.quartz-scheduler.org/), please see [our Quartz integration](https://docs.sentry.io/platforms/java/guides/spring-boot/integrations/quartz.md). You may also [send check-ins manually](https://docs.sentry.io/platforms/java/crons.md).

The `@SentryCheckIn` annotation requires `org.aspectj:aspectjweaver` to be present as a dependency in your project.

## [Check-Ins (Recommended)](https://docs.sentry.io/platforms/java/guides/spring-boot/crons.md#check-ins-recommended)

Check-in monitoring allows you to track a job's progress by completing two check-ins: one at the start of your job and another at the end of your job. This two-step process allows Sentry to notify you if your job didn't start when expected (missed) or if it exceeded its maximum runtime (failed). To start sending check-ins simply add the `@SentryCheckIn("<monitor-slug>")` annotation to the method you want to send check-ins for.

```java
import io.sentry.spring.jakarta.checkin.SentryCheckIn;

@Component
public class CustomJob {

  @Scheduled(fixedRate = 3 * 60 * 1000L)
  @SentryCheckIn("<monitor-slug>") // 👈
  void execute() throws InterruptedException {
    // your task code
  }
}
```

## [Heartbeat](https://docs.sentry.io/platforms/java/guides/spring-boot/crons.md#heartbeat)

Heartbeat monitoring notifies Sentry of a job's status through one check-in. This setup will only notify you if your job didn't start when expected (missed). If you need to track a job to see if it exceeded its maximum runtime (failed), use check-ins instead. To start sending heartbeats simply add the `@SentryCheckIn(monitorSlug = "<monitor-slug>", heartbeat = true)` annotation to the method you want to send heartbeats for.

```java
import io.sentry.spring.jakarta.checkin.SentryCheckIn;

@Component
public class CustomJob {

  @Scheduled(fixedRate = 3 * 60 * 1000L)
  @SentryCheckIn(monitorSlug = "<monitor-slug>", heartbeat = true) // 👈
  void execute() throws InterruptedException {
    // your task code
  }
}
```

## [Alerts](https://docs.sentry.io/platforms/java/guides/spring-boot/crons.md#alerts)

When your recurring job fails to check in (missed), runs beyond its configured maximum runtime (failed), or manually reports a failure, Sentry will create an error event with a tag to your monitor.

To receive alerts about these events:

1. Navigate to **Alerts** in the sidebar.
2. Create a new alert and select "Issues" under "Errors" as the alert type.
3. Configure your alert and define a filter match to use: `The event's tags match {key} {match} {value}`.

Example: `The event's tags match monitor.slug equals my-monitor-slug-here`

Learn more in [Issue Alert Configuration](https://docs.sentry.io/product/alerts/create-alerts/issue-alert-config.md).

## [Rate Limits](https://docs.sentry.io/platforms/java/guides/spring-boot/crons.md#rate-limits)

To prevent abuse and resource overuse, Crons limits check-ins to **6 per minute for each monitor environment**.

For example, if you have a monitor called "database-backup" with two environments:

* `database-backup` in environment `production` can send up to 6 check-ins per minute
* `database-backup` in environment `staging` can also send up to 6 check-ins per minute
* Combined, they can send up to 12 check-ins per minute

You can verify if any check-ins are being dropped by visiting the [Usage Stats](https://docs.sentry.io/product/stats.md#usage-stats) page. To avoid dropped check-ins, ensure your monitors don't exceed the rate limit.

## Pages in this section

- [Troubleshooting](https://docs.sentry.io/platforms/java/guides/spring-boot/crons/troubleshooting.md)