Update pom.xml

.gitignore

@@ -1 +1,2 @@
 .idea/*
+target

Jenkinsfile-basic

@@ -0,0 +1,28 @@
+#!/usr/bin/env groovy
+
+pipeline {
+    agent none
+    stages {
+        stage('build') {
+            steps {
+                script {
+                    echo "Building the application..."
+                }
+            }
+        }
+        stage('test') {
+            steps {
+                script {
+                    echo "Testing the application..."
+                }
+            }
+        }
+        stage('deploy') {
+            steps {
+                script {
+                    echo "Deploying the application..."
+                }
+            }
+        }
+    }
+}

Jenkinsfile-kubernetes/Jenkinsfile

@@ -0,0 +1,75 @@
+#!/usr/bin/env groovy
+
+pipeline {
+    agent any
+    tools {
+        maven 'Maven'
+    }
+    environment {
+        DOCKER_REPO_SERVER = '664574038682.dkr.ecr.eu-west-3.amazonaws.com'
+        DOCKER_REPO = "${DOCKER_REPO_SERVER}/java-maven-app"
+    }
+    stages {
+        stage('increment version') {
+            steps {
+                script {
+                    echo 'incrementing app version...'
+                    sh 'mvn build-helper:parse-version versions:set \
+                        -DnewVersion=\\\${parsedVersion.majorVersion}.\\\${parsedVersion.minorVersion}.\\\${parsedVersion.nextIncrementalVersion} \
+                        versions:commit'
+                    def matcher = readFile('pom.xml') =~ '<version>(.+)</version>'
+                    def version = matcher[0][1]
+                    env.IMAGE_NAME = "$version-$BUILD_NUMBER"
+                }
+            }
+        }
+        stage('build app') {
+            steps {
+               script {
+                   echo "building the application..."
+                   sh 'mvn clean package'
+               }
+            }
+        }
+        stage('build image') {
+            steps {
+                script {
+                    echo "building the docker image..."
+                    withCredentials([usernamePassword(credentialsId: 'ecr-credentials', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
+                        sh "docker build -t ${DOCKER_REPO}:${IMAGE_NAME} ."
+                        sh "echo $PASS | docker login -u $USER --password-stdin ${DOCKER_REPO_SERVER}"
+                        sh "docker push ${DOCKER_REPO}:${IMAGE_NAME}"
+                    }
+                }
+            }
+        }
+        stage('deploy') {
+            environment {
+                AWS_ACCESS_KEY_ID = credentials('jenkins_aws_access_key_id')
+                AWS_SECRET_ACCESS_KEY = credentials('jenkins_aws_secret_access_key')
+                APP_NAME = 'java-maven-app'
+            }
+            steps {
+                script {
+                    echo 'deploying docker image...'
+                    sh 'envsubst < kubernetes/deployment.yaml | kubectl apply -f -'
+                    sh 'envsubst < kubernetes/service.yaml | kubectl apply -f -'
+                }
+            }
+        }
+        stage('commit version update') {
+            steps {
+                script {
+                    withCredentials([usernamePassword(credentialsId: 'gitlab-credentials', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
+                        sh 'git config user.email "jenkins@example.com"'
+                        sh 'git config user.name "Jenkins"'
+                        sh "git remote set-url origin https://${USER}:${PASS}@gitlab.com/nanuchi/java-maven-app.git"
+                        sh 'git add .'
+                        sh 'git commit -m "ci: version bump"'
+                        sh 'git push origin HEAD:jenkins-jobs'
+                    }
+                }
+            }
+        }
+    }
+}

Jenkinsfile-simple-pipeline/Jenkinsfile

@@ -0,0 +1,40 @@
+#!/usr/bin/env groovy
+
+def gv
+
+pipeline {
+    agent any
+    tools {
+        maven 'Maven'
+    }
+    stages {
+        stage("init") {
+            steps {
+                script {
+                    gv = load "script.groovy"
+                }
+            }
+        }
+        stage("build jar") {
+            steps {
+                script {
+                    gv.buildJar()
+                }
+            }
+        }
+        stage("build image") {
+            steps {
+                script {
+                    gv.buildImage()
+                }
+            }
+        }
+        stage("deploy") {
+            steps {
+                script {
+                    gv.deployApp()
+                }
+            }
+        }
+    }
+}

Jenkinsfile-simple-pipeline/script.groovy

@@ -16,4 +16,4 @@ def deployApp() {
     echo 'deploying the application...'
 } 
 
-return this
+return this

Jenkinsfile-syntax/Jenkinsfile

@@ -0,0 +1,49 @@
+#!/usr/bin/env groovy
+
+def gv
+
+pipeline {
+    agent any
+    parameters {
+        choice(name: 'VERSION', choices: ['1.1.0', '1.2.0', '1.3.0'], description: '')
+        booleanParam(name: 'executeTests', defaultValue: true, description: '')
+    }
+    stages {
+        stage("init") {
+            steps {
+                script {
+                   gv = load "script.groovy"
+                }
+            }
+        }
+        stage("build") {
+            steps {
+                script {
+                    gv.buildApp()
+                }
+            }
+        }
+        stage("test") {
+            when {
+                expression {
+                    params.executeTests
+                }
+            }
+            steps {
+                script {
+                    gv.testApp()
+                }
+            }
+        }
+        stage("deploy") {
+            steps {
+                script {
+                    env.ENV = input message: "Select the environment to deploy to", ok: "Done", parameters: [choice(name: 'ONE', choices: ['dev', 'staging', 'prod'], description: '')]
+
+                    gv.deployApp()
+                    echo "Deploying to ${ENV}"
+                }
+            }
+        }
+    }
+}

Jenkinsfile-syntax/script.groovy

@@ -0,0 +1,19 @@
+def buildJar() {
+    echo "building the application..."
+    sh 'mvn package'
+} 
+
+def buildImage() {
+    echo "building the docker image..."
+    withCredentials([usernamePassword(credentialsId: 'docker-hub-repo', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
+        sh 'docker build -t nanajanashia/demo-app:jma-2.0 .'
+        sh "echo $PASS | docker login -u $USER --password-stdin"
+        sh 'docker push nanajanashia/demo-app:jma-2.0'
+    }
+} 
+
+def deployApp() {
+    echo 'deploying the application...'
+} 
+
+return this

Jenkinsfile-version-increment/Jenkinsfile

@@ -31,7 +31,7 @@ pipeline {
             steps {
                 script {
                     echo "building the docker image..."
-                    withCredentials([usernamePassword(credentialsId: 'docker-hub', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
+                    withCredentials([usernamePassword(credentialsId: 'docker-hub-repo', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
                         sh "docker build -t nanajanashia/demo-app:${IMAGE_NAME} ."
                         sh "echo $PASS | docker login -u $USER --password-stdin"
                         sh "docker push nanajanashia/demo-app:${IMAGE_NAME}"
@@ -42,12 +42,7 @@ pipeline {
         stage('deploy') {
             steps {
                 script {
-                    withKubeConfig([credentialsId: 'k8s-credentials', serverUrl: 'https://7293fae4-4c9d-4629-bc82-262d0a2b8e3c.eu-central-2.linodelke.net']) {
+                    echo 'deploying docker image to EC2...'
-                        withCredentials([usernamePassword(credentialsId: 'docker-hub', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
-                            sh "kubectl create secret docker-registry my-registry-key --docker-server=docker.io --docker-username=$USER --docker-password=$PASS"
-                        }
-                        sh 'envsubst < kubernetes/deployment.yaml | kubectl apply -f -'
-                    }
                 }
             }
         }

freestyle-build.sh

@@ -0,0 +1 @@
+npm --version

kubernetes/deployment.yaml

@@ -1,25 +1,24 @@
 apiVersion: apps/v1
 kind: Deployment
 metadata:
-  name: java-maven-app
+  name: $APP_NAME
   labels:
-    app: java-maven-app
+    app: $APP_NAME
 spec:
-  replicas: 2
+  replicas: 1
   selector:
     matchLabels:
-      app: java-maven-app
+      app: $APP_NAME
   template:
     metadata:
       labels:
-        app: java-maven-app
+        app: $APP_NAME
     spec:
       imagePullSecrets:
-        - name: my-registry-key
+        - name: aws-registry-key
       containers:
-      - name: java-maven-app
+        - name: $APP_NAME
-        image: nanajanashia/demo-app:$IMAGE_NAME
+          image: $DOCKER_REPO:$IMAGE_NAME
-        imagePullPolicy: Always
+          imagePullPolicy: Always
-        ports:
+          ports:
-        - containerPort: 8080
+            - containerPort: 8080
-

kubernetes/service.yaml

@@ -1,10 +1,10 @@
 apiVersion: v1
 kind: Service
 metadata:
-  name: java-maven-app
+  name: $APP_NAME
 spec:
   selector:
-    app: java-maven-app
+    app: $APP_NAME
   ports:
     - protocol: TCP
       port: 80

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.example</groupId>
     <artifactId>java-maven-app</artifactId>
-    <version>1.1.0-SNAPSHOT</version>
+    <version>1.1.7</version>
 
     <build>
         <plugins>
@@ -22,6 +22,17 @@
                     </execution>
                 </executions>
             </plugin>
+
+            <!-- to handle any Java version mismatch, add the following configuration for maven-compiler-plugin -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.6.0</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>            
         </plugins>
     </build>
 

src/test/java/AppTest.java

@@ -0,0 +1,16 @@
+import com.example.Application;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class AppTest {
+
+    @Test
+    public void testApp() {
+        Application myApp = new Application();
+
+        String result = myApp.getStatus();
+
+        assertEquals("OK", result);
+    }
+
+}

target/maven-archiver/pom.properties

@@ -0,0 +1,5 @@
+#Generated by Maven
+#Sat Dec 05 15:54:34 UTC 2020
+version=1.1.7
+groupId=com.example
+artifactId=java-maven-app

target/surefire-reports/AppTest.txt

@@ -0,0 +1,4 @@
+-------------------------------------------------------------------------------
+Test set: AppTest
+-------------------------------------------------------------------------------
+Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.099 sec

target/surefire-reports/TEST-AppTest.xml

@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<testsuite tests="1" failures="0" name="AppTest" time="0.01" errors="0" skipped="0">
+  <properties>
+    <property name="java.runtime.name" value="OpenJDK Runtime Environment"/>
+    <property name="sun.boot.library.path" value="/usr/local/openjdk-8/jre/lib/amd64"/>
+    <property name="java.vm.version" value="25.242-b08"/>
+    <property name="java.vm.vendor" value="Oracle Corporation"/>
+    <property name="maven.multiModuleProjectDirectory" value="/var/jenkins_home/workspace/java-maven-app_jenkins-jobs"/>
+    <property name="java.vendor.url" value="http://java.oracle.com/"/>
+    <property name="path.separator" value=":"/>
+    <property name="guice.disable.misplaced.annotation.check" value="true"/>
+    <property name="java.vm.name" value="OpenJDK 64-Bit Server VM"/>
+    <property name="file.encoding.pkg" value="sun.io"/>
+    <property name="sun.java.launcher" value="SUN_STANDARD"/>
+    <property name="sun.os.patch.level" value="unknown"/>
+    <property name="java.vm.specification.name" value="Java Virtual Machine Specification"/>
+    <property name="user.dir" value="/var/jenkins_home/workspace/java-maven-app_jenkins-jobs"/>
+    <property name="java.runtime.version" value="1.8.0_242-b08"/>
+    <property name="java.awt.graphicsenv" value="sun.awt.X11GraphicsEnvironment"/>
+    <property name="java.endorsed.dirs" value="/usr/local/openjdk-8/jre/lib/endorsed"/>
+    <property name="os.arch" value="amd64"/>
+    <property name="java.io.tmpdir" value="/tmp"/>
+    <property name="line.separator" value="
+"/>
+    <property name="java.vm.specification.vendor" value="Oracle Corporation"/>
+    <property name="os.name" value="Linux"/>
+    <property name="classworlds.conf" value="/var/jenkins_home/tools/hudson.tasks.Maven_MavenInstallation/Maven/bin/m2.conf"/>
+    <property name="sun.jnu.encoding" value="UTF-8"/>
+    <property name="java.library.path" value="/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib"/>
+    <property name="maven.conf" value="/var/jenkins_home/tools/hudson.tasks.Maven_MavenInstallation/Maven/conf"/>
+    <property name="java.specification.name" value="Java Platform API Specification"/>
+    <property name="java.class.version" value="52.0"/>
+    <property name="sun.management.compiler" value="HotSpot 64-Bit Tiered Compilers"/>
+    <property name="os.version" value="5.4.0-51-generic"/>
+    <property name="library.jansi.path" value="/var/jenkins_home/tools/hudson.tasks.Maven_MavenInstallation/Maven/lib/jansi-native"/>
+    <property name="user.home" value="/var/jenkins_home"/>
+    <property name="user.timezone" value="Etc/UTC"/>
+    <property name="java.awt.printerjob" value="sun.print.PSPrinterJob"/>
+    <property name="java.specification.version" value="1.8"/>
+    <property name="file.encoding" value="UTF-8"/>
+    <property name="user.name" value="jenkins"/>
+    <property name="java.class.path" value="/var/jenkins_home/tools/hudson.tasks.Maven_MavenInstallation/Maven/boot/plexus-classworlds-2.6.0.jar"/>
+    <property name="java.vm.specification.version" value="1.8"/>
+    <property name="sun.arch.data.model" value="64"/>
+    <property name="java.home" value="/usr/local/openjdk-8/jre"/>
+    <property name="sun.java.command" value="org.codehaus.plexus.classworlds.launcher.Launcher clean package"/>
+    <property name="java.specification.vendor" value="Oracle Corporation"/>
+    <property name="user.language" value="en"/>
+    <property name="awt.toolkit" value="sun.awt.X11.XToolkit"/>
+    <property name="java.vm.info" value="mixed mode"/>
+    <property name="java.version" value="1.8.0_242"/>
+    <property name="java.ext.dirs" value="/usr/local/openjdk-8/jre/lib/ext:/usr/java/packages/lib/ext"/>
+    <property name="securerandom.source" value="file:/dev/./urandom"/>
+    <property name="sun.boot.class.path" value="/usr/local/openjdk-8/jre/lib/resources.jar:/usr/local/openjdk-8/jre/lib/rt.jar:/usr/local/openjdk-8/jre/lib/sunrsasign.jar:/usr/local/openjdk-8/jre/lib/jsse.jar:/usr/local/openjdk-8/jre/lib/jce.jar:/usr/local/openjdk-8/jre/lib/charsets.jar:/usr/local/openjdk-8/jre/lib/jfr.jar:/usr/local/openjdk-8/jre/classes"/>
+    <property name="java.vendor" value="Oracle Corporation"/>
+    <property name="maven.home" value="/var/jenkins_home/tools/hudson.tasks.Maven_MavenInstallation/Maven"/>
+    <property name="file.separator" value="/"/>
+    <property name="java.vendor.url.bug" value="http://bugreport.sun.com/bugreport/"/>
+    <property name="sun.cpu.endian" value="little"/>
+    <property name="sun.io.unicode.encoding" value="UnicodeLittle"/>
+    <property name="sun.cpu.isalist" value=""/>
+  </properties>
+  <testcase classname="AppTest" name="testApp" time="0.01"/>
+</testsuite>