First

.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto

.gitignore

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+.DS_Store
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+
+# Avoid ignoring Maven wrapper jar file (.jar files are usually ignored)
+!/.mvn/wrapper/maven-wrapper.jar
+.idea

Jenkinsfile

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+node {
+    stage('Configure') {
+        env.PATH = "${tool 'maven-3.3.9'}/bin:${env.PATH}"
+        version = '1.0.' + env.BUILD_NUMBER
+        currentBuild.displayName = version
+
+        properties([
+                buildDiscarder(logRotator(artifactDaysToKeepStr: '', artifactNumToKeepStr: '', daysToKeepStr: '', numToKeepStr: '10')),
+                [$class: 'GithubProjectProperty', displayName: '', projectUrlStr: 'https://github.com/taz-jt/simple-java-maven-app/'],
+                pipelineTriggers([[$class: 'GitHubPushTrigger']])
+            ])
+    }
+
+    stage('Checkout') {
+        git 'https://github.com/taz-jt/simple-java-maven-app'
+    }
+
+    /*
+    stage('Version') {
+        sh "echo \'\ninfo.build.version=\'$version >> src/main/resources/application.properties || true"
+        sh "mvn -B -V -U -e versions:set -DnewVersion=$version"
+    }
+    */
+
+    stage('Build') {
+        sh 'mvn -B -DskipTests clean package'
+    }
+
+    stage('Test') {
+        sh 'mvn test'
+    }
+
+    stage('Archive') {
+        junit allowEmptyResults: true, testResults: '**/target/**/TEST*.xml'
+    }
+
+    /*
+    stage('Deploy') {
+        // Depends on the 'Credentials Binding Plugin'
+        // (https://wiki.jenkins-ci.org/display/JENKINS/Credentials+Binding+Plugin)
+        withCredentials([[$class          : 'UsernamePasswordMultiBinding', credentialsId: 'cloudfoundry',
+                          usernameVariable: 'USERNAME', passwordVariable: 'PASSWORD']]) {
+            sh '''
+                curl -L "https://cli.run.pivotal.io/stable?release=linux64-binary&source=github" | tar -zx
+                ./cf api https://api.run.pivotal.io
+                ./cf auth $USERNAME $PASSWORD
+                ./cf target -o bertjan-demo -s development
+                ./cf push
+               '''
+        }
+    }
+    */
+}

Jenkinsfile-backup

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+pipeline {
+    agent {
+        docker {
+            image 'maven:3-alpine'
+            args '-v /root/.m2:/root/.m2'
+        }
+    }
+    options {
+        skipStagesAfterUnstable()
+    }
+    stages {
+        stage('Build') {
+            steps {
+                sh 'mvn -B -DskipTests clean package'
+            }
+        }
+        stage('Test') {
+            steps {
+                sh 'mvn test'
+            }
+            post {
+                always {
+                    junit 'target/surefire-reports/*.xml'
+                }
+            }
+        }
+    }
+}

README.md

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+# simple-java-maven-app
+
+This repository is for the
+[Build a Java app with Maven](https://jenkins.io/doc/tutorials/build-a-java-app-with-maven/)
+tutorial in the [Jenkins User Documentation](https://jenkins.io/doc/).
+
+The repository contains a simple Java application which outputs the string
+"Hello world!" and is accompanied by a couple of unit tests to check that the
+main application works as expected. The results of these tests are saved to a
+JUnit XML report.
+
+The `jenkins` directory contains an example of the `Jenkinsfile` (i.e. Pipeline)
+you'll be creating yourself during the tutorial and the `scripts` subdirectory
+contains a shell script with commands that are executed when Jenkins processes
+the "Deliver" stage of your Pipeline.

jenkins/Jenkinsfile

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+pipeline {
+    agent {
+        docker {
+            image 'maven:3-alpine'
+            args '-v /root/.m2:/root/.m2'
+        }
+    }
+    stages {
+        stage('Build') {
+            steps {
+                sh 'mvn -B -DskipTests clean package'
+            }
+        }
+        stage('Test') {
+            steps {
+                sh 'mvn test'
+            }
+            post {
+                always {
+                    junit 'target/surefire-reports/*.xml'
+                }
+            }
+        }
+        stage('Deliver') {
+            steps {
+                sh './jenkins/scripts/deliver.sh'
+            }
+        }
+    }
+}

jenkins/scripts/deliver.sh

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+#!/usr/bin/env bash
+
+echo 'The following Maven command installs your Maven-built Java application'
+echo 'into the local Maven repository, which will ultimately be stored in'
+echo 'Jenkins''s local Maven repository (and the "maven-repository" Docker data'
+echo 'volume).'
+set -x
+mvn jar:jar install:install help:evaluate -Dexpression=project.name
+set +x
+
+echo 'The following complex command extracts the value of the <name/> element'
+echo 'within <project/> of your Java/Maven project''s "pom.xml" file.'
+set -x
+NAME=`mvn help:evaluate -Dexpression=project.name | grep "^[^\[]"`
+set +x
+
+echo 'The following complex command behaves similarly to the previous one but'
+echo 'extracts the value of the <version/> element within <project/> instead.'
+set -x
+VERSION=`mvn help:evaluate -Dexpression=project.version | grep "^[^\[]"`
+set +x
+
+echo 'The following command runs and outputs the execution of your Java'
+echo 'application (which Jenkins built using Maven) to the Jenkins UI.'
+set -x
+java -jar target/${NAME}-${VERSION}.jar

my-app.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_6">
+    <output url="file://$MODULE_DIR$/target/classes" />
+    <output-test url="file://$MODULE_DIR$/target/test-classes" />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" scope="TEST" name="Maven: junit:junit:4.11" level="project" />
+    <orderEntry type="library" scope="TEST" name="Maven: org.hamcrest:hamcrest-core:1.3" level="project" />
+  </component>
+</module>

pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.mycompany.app</groupId>
+  <artifactId>my-app</artifactId>
+  <packaging>jar</packaging>
+  <version>1.0-SNAPSHOT</version>
+  <name>my-app</name>
+  <url>http://maven.apache.org</url>
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.11</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+  <build>
+    <plugins>
+      <plugin>
+        <!-- Build an executable JAR -->
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.8.1</version>
+        <configuration>
+          <source>1.6</source>
+          <target>1.6</target>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>3.2.0</version>
+        <configuration>
+          <archive>
+            <manifest>
+              <addClasspath>true</addClasspath>
+              <classpathPrefix>lib/</classpathPrefix>
+              <mainClass>com.mycompany.app.App</mainClass>
+            </manifest>
+          </archive>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>

src/main/java/com/mycompany/app/App.java

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+package com.mycompany.app;
+
+/**
+ * Hello world!
+ */
+public class App
+{
+
+    private final String message = "Hello World!";
+
+    public App() {}
+
+    public static void main(String[] args) {
+        System.out.println(new App().getMessage());
+    }
+
+    private final String getMessage() {
+        return message;
+    }
+
+}

src/test/java/com/mycompany/app/AppTest.java

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+package com.mycompany.app;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.After;
+import static org.junit.Assert.*;
+
+/**
+ * Unit test for simple App.
+ */
+public class AppTest
+{
+
+    private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
+
+    @Before
+    public void setUpStreams() {
+        System.setOut(new PrintStream(outContent));
+    }
+
+    @Test
+    public void testAppConstructor() {
+        try {
+            new App();
+        } catch (Exception e) {
+            fail("Construction failed.");
+        }
+    }
+
+    @Test
+    public void testAppMain()
+    {
+        App.main(null);
+        try {
+            assertEquals("Hello World!" + System.getProperty("line.separator"), outContent.toString());
+        } catch (AssertionError e) {
+            fail("\"message\" is not \"Hello World!\"");
+        }
+    }
+
+    @After
+    public void cleanUpStreams() {
+        System.setOut(null);
+    }
+
+}