Update 'Jenkinsfile'

Jenkinsfile

@@ -1,32 +1,25 @@
-pipeline {
-   agent any
-
- //  tools {
-      // Install the Maven version configured as "M3" and add it to the path.
-      //maven "M3"
-  // }
-
-   stages {
-      stage('Build') {
-         steps {
+node {
+   def mvnHome
+   stage('Preparation') { // for display purposes
       // Get some code from a GitHub repository
       git 'https://gogs.informatik.hs-fulda.de/Continous_Integration_in_der_Praxis/colaboration-training.git'
-
-            // Run Maven on a Unix agent.
-            sh "mvn -Dmaven.test.failure.ignore=true clean package"
-
-            // To run Maven on a Windows agent, use
-            // bat "mvn -Dmaven.test.failure.ignore=true clean package"
+      // Get the Maven tool.
+      // ** NOTE: This 'M3' Maven tool must be configured
+      // **       in the global configuration.           
+      mvnHome = tool 'M3'
    }
-
-         post {
-            // If Maven was able to run the tests, even if some of the test
-            // failed, record the test results and archive the jar file.
-            success {
-              // junit '**/target/surefire-reports/TEST-*.xml'
-               archiveArtifacts 'target/*.jar'
+   stage('Build') {
+      // Run the maven build
+      withEnv(["MVN_HOME=$mvnHome"]) {
+         if (isUnix()) {
+            sh '"$MVN_HOME/bin/mvn" -Dmaven.test.failure.ignore clean package'
+         } else {
+            bat(/"%MVN_HOME%\bin\mvn" -Dmaven.test.failure.ignore clean package/)
          }
       }
    }
+   stage('Results') {
+//      junit '**/target/surefire-reports/TEST-*.xml'
+      archiveArtifacts 'target/*.jar'
    }
 }