adding slack send

Jenkinsfile

@@ -1,15 +1,56 @@
 pipeline {
     agent any
-    stages {
+    try {
+        notifyBuild('STARTED')
+
         stage('Build') {
-            steps {
             sh './mvnw package'
         }
+
+        stage('Testing') {
+            echo 'Testing'
         }
-        stage('Test') {
-            steps {
-                echo 'Testing..'
+
+        stage('Package') {
+            echo 'Staging'
+        }
+
+        stage('Deploy') {
+            echo 'Deploy'
+        }
+
+  } catch (e) {
+    // If there was an exception thrown, the build failed
+    currentBuild.result = "FAILED"
+    throw e
+  } finally {
+    // Success or failure, always send notifications
+    notifyBuild(currentBuild.result)
   }
 }
+
+def notifyBuild(String buildStatus = 'STARTED') {
+  // build status of null means successful
+  buildStatus =  buildStatus ?: 'SUCCESSFUL'
+
+  // Default values
+  def colorName = 'RED'
+  def colorCode = '#FF0000'
+  def subject = "${buildStatus}: Job '${env.JOB_NAME} [${env.BUILD_NUMBER}]'"
+  def summary = "${subject} (${env.BUILD_URL})"
+
+  // Override default values based on build status
+  if (buildStatus == 'STARTED') {
+    color = 'YELLOW'
+    colorCode = '#FFFF00'
+  } else if (buildStatus == 'SUCCESSFUL') {
+    color = 'GREEN'
+    colorCode = '#00FF00'
+  } else {
+    color = 'RED'
+    colorCode = '#FF0000'
   }
+
+  // Send notifications
+  slackSend (color: colorCode, message: summary)
 }