Extract version ID from POM in a Jenkins pipeline

Question

I've created a pipeline and using the embedded groovy pipeline script definition and can't seem to get the version ID of the project from the POM. I tried this which works in a groovy console but on in the Jenkins build pipeline script:

def project = new XmlSlurper().parse(new File("pom.xml")) def pomv = project.version.toString() 

According to the documentation Jenkins has a $POM_VERSION but the value doesn't have anything in it when I assign it to a variable and echo it out.

def pomv = "$POM_VERSION" 

OR

def pomv = '$POM_VERSION" 

Answer 1

Use readMavenPom like this:

pom = readMavenPom file: 'pom.xml' pom.version 

See Model reference for properties (like the above version).

For this to work, one has to install Pipeline Utility Steps plugin

Answer 2

In Jenkins 2.138.3 there are two different types of pipelines.

Declarative and Scripted pipelines.

"Declarative pipelines is a new extension of the pipeline DSL (it is basically a pipeline script with only one step, a pipeline step with arguments (called directives), these directives should follow a specific syntax. The point of this new format is that it is more strict and therefore should be easier for those new to pipelines, allow for graphical editing and much more. scripted pipelines is the fallback for advanced requirements."

jenkins pipeline: agent vs node?

Here is an example of a Declarative Pipeline:

pipeline {      agent any       environment {     //Use Pipeline Utility Steps plugin to read information from pom.xml into env variables     IMAGE = readMavenPom().getArtifactId()     VERSION = readMavenPom().getVersion()     }       stages {          stage('Test') {             steps {                 echo "${VERSION}"             }          }      }  } 

Example of Scripted Pipeline

node('master') {    stage('Test') {     IMAGE = readMavenPom().getArtifactId()     VERSION = readMavenPom().getVersion()     echo "IMAGE: ${IMAGE}"     echo "VERSION: ${VERSION}"   }  } 

Here are some good links:

Declarative https://github.com/jenkinsci/pipeline-examples/blob/master/declarative-examples/jenkinsfile-examples/mavenDocker.groovy

Scripted https://bulldogjob.com/articles/726-exploring-jenkins-pipelines-a-simple-delivery-flow