Configure version increment in build

Jenkinsfile

@@ -1,36 +1,41 @@
 #!/usr/bin/env groovy
 
-library identifier: 'jenkins-shared-library@master', retriever: modernSCM(
-    [$class: 'GitSCMSource',
-     remote: 'https://gitlab.com/nanuchi/jenkins-shared-library.git',
-     credentialsId: 'gitlab-credentials'
-    ]
-)
-
 pipeline {
     agent any
     tools {
         maven 'Maven'
     }
-    environment {
-        IMAGE_NAME = 'nanajanashia/demo-app:java-maven-2.0'
-    }
     stages {
+        stage('increment version') {
+            steps {
+                script {
+                    echo 'incrementing app version...'
+                    sh 'mvn build-helper:parse-version versions:set \
+                        -DnewVersion=\\\${parsedVersion.majorVersion}.\\\${parsedVersion.minorVersion}.\\\${parsedVersion.newIncrementalVersion \
+                        versions:commit'
+                    def matcher = readFile('pom.xml') =~ '<version>(.+)</version>'
+                    def version = matcher[0][1]
+                    env.IMAGE_NAME = "$version-$BUILD_NUMBER"
+                }
+            }
+        }
         stage('build app') {
             steps {
                script {
-                  echo 'building application jar...'
-                  buildJar()
+                   echo "building the application..."
+                   sh 'mvn clean package'
                }
             }
         }
         stage('build image') {
             steps {
                 script {
-                   echo 'building docker image...'
-                   buildImage(env.IMAGE_NAME)
-                   dockerLogin()
-                   dockerPush(env.IMAGE_NAME)
+                    echo "building the docker image..."
+                    withCredentials([usernamePassword(credentialsId: 'docker-hub-repo', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
+                        sh "docker build -t nanajanashia/demo-app:$IMAGE_NAME ."
+                        sh "echo $PASS | docker login -u $USER --password-stdin"
+                        sh "docker push nanajanashia/demo-app:$IMAGE_NAME"
+                    }
                 }
             }
         }
@@ -38,15 +43,6 @@ pipeline {
             steps {
                 script {
                    echo 'deploying docker image to EC2...'
-
-                   def shellCmd = "bash ./server-cmds.sh ${IMAGE_NAME}"
-                   def ec2Instance = "ec2-user@35.180.251.121"
-
-                   sshagent(['ec2-server-key']) {
-                       sh "scp server-cmds.sh ${ec2Instance}:/home/ec2-user"
-                       sh "scp docker-compose.yaml ${ec2Instance}:/home/ec2-user"
-                       sh "ssh -o StrictHostKeyChecking=no ${ec2Instance} ${shellCmd}"
-                   }
                 }
             }
         }