Jenkins is an open source automation server that can be using to configure Continuous Integration for projects written in many programming languages. Let's consider the case of an application that is Java-based, and which has Ant as a build tool.

We need to tell Jenkins where the Ant installable directory is available.

Download the required Ant version or install automatically.

1. Open the Jenkins dashboard.
2. Go to Manage Jenkins.
3. Go to Global Tool Configuration to configure the tools, their locations, and automatic installers.
4. Go to the Ant section.
5. Give the Name and click on Install Automatically, or give the path to an existing location where the Ant installation is available.
6. You can give a logical name such as ANT 1.10.1 or ANT 1.9.1 to identify the correct version while configuring a build job.
7. You can add multiple Ants based on the version in Jenkins:

When you create a build job in Jenkins and configure it, you need to specify the Ant version that will be used by the build execution. You can use existing Ant installation available on the system as well if you don't want to install automatically.