Example declarative pipeline

examplePipeline.groovy

pipeline {
    agent docker: "maven:3.3.9-jdk-8"

    environment {
        MAVEN_OPTS = "-Xmx1024m"
    }

    stages {
        stage("Build") {
            steps {
                sh 'mvn clean install -B -Dmaven.test.failure.ignore=true'
            }
            post {
                success {
                    archive "**/target/**/*.jar"
                    junit '**/target/surefire-reports/*.xml'
                }
            }
        }
    }

    postBuild {
        always {
            echo "Build done"
        }
    }
    
    notifications {
        success {
            mail to: "anyone@example.com", subject: "Build Successful"
        }
        failure {
            mail to: "anyone@example.com", subject: "Build Failed"
        }
        unstable {
            mail to: "anyone@example.com", subject: "Build Unstable"
        }
    }

}