Tools directive in Jenkins - Mini Project: Build & Apply

Using Jenkins Tools Directive

📖 Scenario: You are setting up a Jenkins pipeline to build a Java project. Jenkins needs to use a specific JDK version installed on the server.

🎯 Goal: Learn how to use the tools directive in a Jenkins pipeline to specify the JDK version for your build.

📋 What You'll Learn

Create a Jenkins pipeline script

Use the tools directive to specify JDK 11

Print the Java version to verify the correct JDK is used

💡 Why This Matters

🌍 Real World

In real projects, Jenkins pipelines often need specific tools like JDKs or build tools. The <code>tools</code> directive helps Jenkins pick the right versions automatically.

💼 Career

Knowing how to configure Jenkins pipelines with the correct tools is essential for DevOps engineers and automation specialists to ensure consistent builds.

1

Create a basic Jenkins pipeline

Write a Jenkins pipeline script with a pipeline block and an empty agent any section.

Jenkins

pipeline {
    agent any
    // Your code here
}

Need a hint?

Start with the basic pipeline structure including pipeline and agent any.

2

Add the tools directive to specify JDK 11

Inside the pipeline block, add a tools directive specifying jdk 'JDK11' to use JDK 11.

Jenkins

pipeline {
    agent any
    tools {
        // Your code here
    }
}

Need a hint?

Use the tools block and specify jdk 'JDK11' exactly.

3

Add a stage to print the Java version

Add a stage named 'Check Java' with a steps block that runs the shell command java -version.

Jenkins

pipeline {
    agent any
    tools {
        jdk 'JDK11'
    }
    // Your code here
}

Need a hint?

Use stages block with a stage named 'Check Java'. Inside steps, run sh 'java -version'.

4

Print the Java version output

Run the pipeline and ensure the console output shows the Java version starting with openjdk version "11.

Jenkins

pipeline {
    agent any
    tools {
        jdk 'JDK11'
    }
    stages {
        stage('Check Java') {
            steps {
                sh 'java -version'
            }
        }
    }
}

// Run the pipeline and check output

Need a hint?

Look at the Jenkins console output after running the pipeline. It should show the Java version starting with openjdk version "11.