Jenkins Multibranch Pipeline - mvn is not recognized as a command

Question

I'd like to setup a simple Multibranch Pipeline for my Spring Boot project. I've created such a Multibranch Pipeline in Jenkins, wired in my GitHub repo where I've pushed a very basic Jenkinsfile with a simple step:

pipeline {
agent any
stages {
    stage('Build with unit testing') {
        steps {
            bat 'mvn clean package'
        }
    }
}
}

However Jenkins doesn't seem to understand the mvn command, because I get the following message in my build:

'mvn' is not recognized as an internal or external command, operable program or batch file.

In went to the Global Tool Configuration where I tried to specify a Maven installation, but regardless of what I do this configuration doesn't seem to persist (I add my Maven, click Apply/Save, go out and come back to this screen again, and the Maven section is empty again, displaying only the "Maven installations..." button. I guess this is the issue. I've read somewhere that this is a Jenkins bug? But could really decode the solution regarding how to solve this in my Jenkinsfile).

Do you guys have any tips how to overcome this problem?

Thanks!

Answer 1

According to the official jenkins docs, you need to declare maven in tools section:

pipeline {
    agent any
    tools {
        maven 'Maven 3.3.9'
        jdk 'jdk8'
    }
    stages {
        stage ('Initialize') {
            steps {
                sh '''
                    echo "PATH = ${PATH}"
                    echo "M2_HOME = ${M2_HOME}"
                '''
            }
        }

        stage ('Build') {
            steps {
                sh 'mvn clean package' 
            }
            post {
                success {
                    junit 'target/surefire-reports/**/*.xml' 
                }
            }
        }
    }
}

Source: https://www.jenkins.io/blog/2017/02/07/declarative-maven-project/

I think your are in windows, so change:

sh 'mvn clean package' 

to

bat 'mvn clean package' 

Also the initialize step could help you to determine if your jenkins is properly configured.