There are three primary methods to get the Jackson2 API plugin onto your controller. 1. The Plugin Manager (Recommended)

If your Jenkins version is very old (e.g., pre-2.200), the latest Jackson2 API may not be compatible. Check the "Minimum Jenkins Requirement" on the plugin page before downloading.

The most reliable way to download the plugin file ( .hpi or .jpi ) is through the official Jenkins artifact repository. Jenkins Plugin Index - Jackson2 API

Here is a comprehensive guide on how to download and manage the Jackson2 API plugin. Direct Download Links

Jenkins Update Center - Jackson2 API Artifacts How to Install Jackson2 API in Jenkins

By using this plugin instead of bundling Jackson themselves, other plugins avoid "classpath hell" (version conflicts). Troubleshooting Common Issues