Great question! Let's walk through your options for setting up email alerts when a new package gets cached to your maven-central proxy repo, since you're running Nexus OSS 3.0.1-01 and open to upgrades or the paid Pro version.

Option 1: Work with Your Current Nexus OSS 3.0.1-01 #

This early OSS version doesn't have native event-based notification features for cache events, but you can build a workaround with external tools:

• Schedule periodic checks via REST API: Write a simple shell or Python script that calls Nexus's REST API to list recently added assets in the maven-central proxy repo. Compare the results against a local log of previously cached packages.
• Trigger email alerts: When the script detects a new package, use an SMTP client (like sendmail or a Python SMTP library) to send an alert email with details like the package's GAV (Group, Artifact, Version) and cache timestamp.
• Note: You'll need to reference the REST API docs specific to your 3.0.1-01 version to get the correct endpoints for listing repository assets.

Option 2: Upgrade to a Newer Nexus OSS Version #

Newer Nexus OSS releases (3.20+) add better automation tools that make this easier:

• Custom Groovy Script Tasks: You can write a Groovy script that registers an event listener for cache events. When a new package is cached to maven-central, the script can trigger an email via SMTP.
  • Example workflow:
    1. Go to Nexus's Script management section.
    2. Create a new Groovy script that listens for org.sonatype.nexus.repository.cache.CacheEvent events.
    3. Add logic to filter events for your maven-central repo, then call an SMTP service to send the alert.
    4. Configure the script to run continuously or on a schedule.
• Webhooks (Limited Support): Some newer OSS versions support basic webhooks. You can set up a webhook to trigger an external service (like a simple Node.js app) that sends emails when a new asset is added.

Option 3: Upgrade to Nexus Repository Pro (Paid Version) #

This is the most straightforward and robust solution:

• Native Event Notifications: Nexus Pro includes an Event Broker that lets you listen directly to "package cached" events for your proxy repo.
• Webhook & Email Integrations: You can configure a webhook to call an SMTP gateway or use Pro's built-in notification templates to send customized email alerts automatically when a new package is cached.
• Additional Benefits: Pro also gives you access to advanced monitoring, audit logs, and easier management of repository events, which simplifies setting up and maintaining these alerts.

Key Notes for Upgrades #

If you choose to upgrade (either to newer OSS or Pro):

• Always back up your Nexus data before starting the upgrade process.
• Follow the official upgrade guidelines to ensure a smooth migration, especially since your current version is quite old.

内容的提问来源于stack exchange，提问作者Krupa