---
title: "Troubleshooting"
description: "Learn how to troubleshoot your Cron Monitoring setup."
url: https://docs.sentry.io/platforms/java/crons/troubleshooting/
---

# Troubleshooting | Sentry for Java

How do I send an attachment with a check-in (such as a log output)?

Attachments aren't supported by our Java SDK yet. For now, you can use the [check-in attachments API](https://docs.sentry.io/product/crons/getting-started/http.md#check-in-attachment-optional).

Why aren't recurring job errors showing up on my monitor details page?

You may not have [linked errors to your monitor](https://docs.sentry.io/platforms/java/crons.md#connecting-errors-to-cron-monitors).

Why am I not receiving alerts when my monitor fails?

You may not have [set up alerts for your monitor](https://docs.sentry.io/platforms/java/crons.md#alerts).

What is the crons data retention policy for check-ins?

Our current data retention policy is 90 days.

Do you support a monitor schedule with a six-field crontab expression?

Currently, we only support crontab expressions with five fields.