Initial commit

.gitattributes

+# Auto detect text files and perform LF normalization
+* text=auto
\ No newline at end of file

.gitignore

+.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

Jenkinsfile

+pipeline {
+    agent {
+        docker {
+            image 'maven:3-alpine' 
+            args '-v /root/.m2:/root/.m2' 
+        }
+    }
+    stages {
+        stage('Build') { 
+            steps {
+                sh 'mvn -B -DskipTests clean package' 
+            }
+        }
+    }
+}

README.md

+# 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

+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

+#!/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

pom.xml

+<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-jar-plugin</artifactId>
+        <version>3.0.2</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

+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

+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);
+    }
+
+}