Jenkins Maven pipeline

In this session we will cover two labs:

Lab1: pipeline for java project

Create a pipeline job: New item–> name the project “mavenproject”–>pipeline –>ok

Install maven build agent on Jenkins master server [use putty]

apt install maven -y

In the pipeline script block, copy and paste below code

pipeline {
agent any
stages {
  stage('SCM code') {
   steps {
    git 'https://github.com/hellokaton/java11-examples.git'
   }
  }
 stage('Build') {
  steps {
   sh 'mvn clean package'
  }
 }
 stage('Publish') {
  steps {
  // Add steps to publish artifacts or deploy the application
  // For example, you can use the 'archiveArtifacts' step to archive built artifacts
  archiveArtifacts 'target/*.jar'
     }
  }
}
}

Break down the stages and steps in the pipeline:

1. SCM code Stage: This stage is responsible for checking out the source code from a Git repository.
   • It uses the git step to clone the repository from the provided URL.
2. Build Stage: In this stage, the code is built using Maven.
   • It uses the sh step to execute the Maven command mvn clean package, which cleans the project, compiles the code, runs tests, and packages the application into a .jar file.
3. Publish Stage: This stage handles the publishing or archiving of the built artifacts.
   • It uses the archiveArtifacts step to archive the .war files located in the target directory. Archiving artifacts is important in case you want to keep track of built binaries for future reference or deployment.
4. Click on Build now and check the build history

 

Lab2:

pipeline {
agent any
parameters {
choice(
name: 'ENVIRONMENT',
choices: ['dev', 'qa', 'prod'],
description: 'Select the deployment environment'
)
}
stages {
stage('SCM code') {
steps {
git 'https://github.com/hellokaton/java11-examples.git'
}
}
stage('Build') {
steps {
sh 'mvn clean package'
}
}
stage('Publish') {
when {
expression { params.ENVIRONMENT == 'prod' }
}
steps {
// Add steps to publish artifacts or deploy the application for 'prod'
// For example, you can use the 'archiveArtifacts' step to archive built artifacts
archiveArtifacts 'target/*.jar'
}
}
}
}

 

Lab 3 : Priority

pipeline {
agent any
parameters {
choice(
name: 'ENVIRONMENT',
choices: ['dev', 'qa', 'prod'],
description: 'Select the deployment environment'
)
choice(
name: 'PRIORITY',
choices: ['high', 'low', 'middle'],
description: 'Select the priority'
)
}
stages {
stage('SCM code') {
steps {
git 'https://github.com/hellokaton/java11-examples.git'
}
}
stage('Build') {
steps {
sh 'mvn clean package'
}
}
stage('Publish High Priority') {
when {
expression { params.ENVIRONMENT == 'prod' && params.PRIORITY == 'high' }
}
steps {
// Add steps to publish high-priority artifacts or deploy the application for 'prod'
// For example, you can use the 'archiveArtifacts' step to archive built artifacts
archiveArtifacts 'target/*.jar'
}
}
stage('Publish Low Priority') {
when {
expression { params.ENVIRONMENT == 'prod' && params.PRIORITY == 'low' }
}
steps {
// Add steps to publish low-priority artifacts or deploy the application for 'prod'
// For example, you can use the 'archiveArtifacts' step to archive built artifacts
archiveArtifacts 'target/*.jar'
}
}
stage('Publish Middle Priority') {
when {
expression { params.ENVIRONMENT == 'prod' && params.PRIORITY == 'middle' }
}
steps {
// Add steps to publish middle-priority artifacts or deploy the application for 'prod'
// For example, you can use the 'archiveArtifacts' step to archive built artifacts
archiveArtifacts 'target/*.jar'
}
}
}
}

Lab4 : Same Jenkins project we will build using maven plugin

1. Go to Dashboard->Manage Jenkins->Manage Plugins

2. Available plugin–>search for maven–>check mark maven integration plugin–>Install without restart

3. Set the java home and maven home

• • • Run the command on ubuntu master from putty

    • mvn --version

      

    • Note down the mvn home and java home

mvn home:  /usr/share/maven

java home:  /usr/lib/jvm/java-17-openjdk-amd64

3. Setup javahome and mvn home on jenkins dashboard

Go to Dashboard->Manage Jenkins–> System configuration–>Global tools configuration

4. JDK–>Add Jdk–>name as Java home–>path “/usr/lib/jvm/java-17-openjdk-amd64”

5. Same page only Under global tool configuration–> Setup maven home

maven–>add maven–>uncheck install automatically–>maven name “mvnho”–>maven_home –>/usr/share/maven and save it

6. Create a New Item–>name “mvnnewproj”–>maven project–>ok

7. under source code management add git repo and save

https://github.com/hellokaton/java11-examples.git

8. Build now–>check build history–>check console output

Observe difference between lab1 and lab2