fix

Dockerfile

@@ -2,7 +2,7 @@ FROM openjdk:8-jre-alpine
 
 EXPOSE 8080
 
-COPY ./target/java-maven-app-*.jar /usr/app/
+COPY ./target/java-maven-app-1.0-SNAPSHOT.jar /usr/app/
 WORKDIR /usr/app
 
-CMD java -jar java-maven-app-*.jar
+ENTRYPOINT ["java", "-jar", "java-maven-app-1.0-SNAPSHOT.jar"]

Jenkinsfile

@@ -1,69 +1,48 @@
 #!/usr/bin/env groovy
 
+library identifier: 'jenkins-shared-library@master', retriever: modernSCM(
+        [$class: 'GitSCMSource',
+         remote: 'https://gitlab.com/nanuchi/jenkins-shared-library.git',
+         credentialsId: 'gitlab-credentials'
+        ]
+)
+
+
+def gv
+
 pipeline {
     agent any
     tools {
         maven 'Maven'
     }
     stages {
-        stage('increment version') {
+        stage("init") {
             steps {
                 script {
-                    echo 'incrementing app version...'
-                    sh 'mvn build-helper:parse-version versions:set \
-                        -DnewVersion=\\\${parsedVersion.majorVersion}.\\\${parsedVersion.minorVersion}.\\\${parsedVersion.nextIncrementalVersion} \
-                        versions:commit'
-                    def matcher = readFile('pom.xml') =~ '<version>(.+)</version>'
-                    def version = matcher[0][1]
-                    env.IMAGE_NAME = "$version-$BUILD_NUMBER"
+                    gv = load "script.groovy"
                 }
             }
         }
-        stage('build app') {
+        stage("build jar") {
             steps {
                 script {
-                    echo "building the application..."
-                    sh 'mvn clean package'
+                    buildJar()
                 }
             }
         }
-        stage('build image') {
+        stage("build and push image") {
             steps {
                 script {
-                    echo "building the docker image..."
-                    withCredentials([usernamePassword(credentialsId: 'docker-hub', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
-                        sh "docker build -t nanajanashia/demo-app:${IMAGE_NAME} ."
-                        sh "echo $PASS | docker login -u $USER --password-stdin"
-                        sh "docker push nanajanashia/demo-app:${IMAGE_NAME}"
-                    }
+                    buildImage 'nanajanashia/demo-app:jma-3.0'
+                    dockerLogin()
+                    dockerPush 'nanajanashia/demo-app:jma-3.0'
                 }
             }
         }
-        stage('deploy') {
+        stage("deploy") {
             steps {
                 script {
-                    withKubeConfig([credentialsId: 'k8s-credentials', serverUrl: 'https://7293fae4-4c9d-4629-bc82-262d0a2b8e3c.eu-central-2.linodelke.net']) {
-                        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 -'
-                    }
-                }
-            }
-        }
-        stage('commit version update') {
-            steps {
-                script {
-                    withCredentials([usernamePassword(credentialsId: 'gitlab-credentials', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
-                        // git config here for the first time run
-                        sh 'git config --global user.email "jenkins@example.com"'
-                        sh 'git config --global 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'
-                    }
+                    gv.deployApp()
                 }
             }
         }

kubernetes/deployment.yaml

@@ -1,25 +0,0 @@
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: java-maven-app
-  labels:
-    app: java-maven-app
-spec:
-  replicas: 2
-  selector:
-    matchLabels:
-      app: java-maven-app
-  template:
-    metadata:
-      labels:
-        app: java-maven-app
-    spec:
-      imagePullSecrets:
-        - name: my-registry-key
-      containers:
-      - name: java-maven-app
-        image: nanajanashia/demo-app:$IMAGE_NAME
-        imagePullPolicy: Always
-        ports:
-        - containerPort: 8080
-

kubernetes/service.yaml

@@ -1,11 +0,0 @@
-apiVersion: v1
-kind: Service
-metadata:
-  name: java-maven-app
-spec:
-  selector:
-    app: java-maven-app
-  ports:
-    - protocol: TCP
-      port: 80
-      targetPort: 8080

pom.xml

@@ -6,24 +6,7 @@
 
     <groupId>com.example</groupId>
     <artifactId>java-maven-app</artifactId>
-    <version>1.1.0-SNAPSHOT</version>
-
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.springframework.boot</groupId>
-                <artifactId>spring-boot-maven-plugin</artifactId>
-                <version>2.3.5.RELEASE</version>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>repackage</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-        </plugins>
-    </build>
+    <version>1.0-SNAPSHOT</version>
 
     <dependencies>
         <dependency>

script.groovy

@@ -1,17 +1,3 @@
-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...'
 }