node/Jenkinsfile.groovy

final String publicRepo = 'https://github.com/kemitix/'
final String mvn = "mvn --batch-mode --update-snapshots --errors"

pipeline {
    agent any
    stages {
        stage('Build & Test') {
            steps {
                withMaven(maven: 'maven', jdk: 'JDK 1.8') {
                    sh "${mvn} clean compile checkstyle:checkstyle pmd:pmd test"
                    // Code Coverage to Jenkins
                    jacoco exclusionPattern: '**/*{Test|IT|Main|Application|Immutable}.class'
                    // PMD to Jenkins
                    pmd canComputeNew: false, defaultEncoding: '', healthy: '', pattern: '', unHealthy: ''
                    // Checkstyle to Jenkins
                    step([$class: 'hudson.plugins.checkstyle.CheckStylePublisher',
                          pattern: '**/target/checkstyle-result.xml',
                          healthy:'20',
                          unHealthy:'100'])
                }
            }
        }
        stage('Verify & Install') {
            steps {
                withMaven(maven: 'maven', jdk: 'JDK 1.8') {
                    sh "${mvn} -DskipTests install"
                }
            }
        }
        stage('Deploy (published release branch)') {
            when {
                expression {
                    (isReleaseBranch() &&
                            isPublished(publicRepo) &&
                            notSnapshot())
                }
            }
            steps {
                withMaven(maven: 'maven', jdk: 'JDK 1.8') {
                    sh "${mvn} --activate-profiles release deploy"
                }
            }
        }
        stage('Build Java 11') {
            steps {
                withMaven(maven: 'maven', jdk: 'JDK 11') {
                    sh "${mvn} clean verify -Djava.version=11"
                }
            }
        }
        stage('Build Java 12') {
            steps {
                withMaven(maven: 'maven', jdk: 'JDK 12') {
                    sh "${mvn} clean verify -Djava.version=12"
                }
            }
        }
    }
}

private boolean isReleaseBranch() {
    return branchStartsWith('release/')
}

private boolean branchStartsWith(final String branchName) {
    startsWith(env.GIT_BRANCH, branchName)
}

private boolean isPublished(final String repo) {
    startsWith(env.GIT_URL, repo)
}

private static boolean startsWith(final String value, final String match) {
    value != null && value.startsWith(match)
}

private boolean notSnapshot() {
    return !(readMavenPom(file: 'pom.xml').version).contains("SNAPSHOT")
}