Jenkins Pipeline for Java based application using Maven, SonarQube, Argo CD & Kubernetes

Here are the step-by-step details to set up an end-to-end Jenkins pipeline for a Java application using SonarQube, Argo CD, Helm, and Kubernetes:

Prerequisites:

• Java application code hosted on a Git repository
• Jenkins server
• Kubernetes cluster
• Helm package manager
• Argo CD

Steps:

1. Install the necessary Jenkins plugins:
   1.1 Git plugin
   1.2 Maven Integration plugin
   1.3 Pipeline plugin
   1.4 Kubernetes Continuous Deploy plugin

2. Create a new Jenkins pipeline:
   2.1 In Jenkins, create a new pipeline job and configure it with the Git repository URL for the Java application.
   2.2 Add a Jenkinsfile to the Git repository to define the pipeline stages.

3. Define the pipeline stages:
    Stage 1: Checkout the source code from Git.
    Stage 2: Build the Java application using Maven.
    Stage 3: Run unit tests using JUnit and Mockito.
    Stage 4: Run SonarQube analysis to check the code quality.
    Stage 5: Package the application into a JAR file.
    Stage 6: Deploy the application to a test environment using Helm.
    Stage 7: Run user acceptance tests on the deployed application.
    Stage 8: Promote the application to a production environment using Argo CD.

4. Configure Jenkins pipeline stages:
    Stage 1: Use the Git plugin to check out the source code from the Git repository.
    Stage 2: Use the Maven Integration plugin to build the Java application.
    Stage 3: Use the JUnit plugins to run unit tests.
    Stage 4: Use the SonarQube plugin to analyze the code quality of the Java application.
    Stage 5: Use the Maven Integration plugin to package the application into a JAR file.
    Stage 6: Use the Kubernetes Continuous Deploy plugin to deploy the application to a test environment using Helm.
    Stage 7: Use a testing framework like Selenium to run user acceptance tests on the deployed application.
    Stage 8: Use Argo CD to promote the application to a production environment.

5. Set up Argo CD:
    Install Argo CD on the Kubernetes cluster.
    Set up a Git repository for Argo CD to track the changes in the Helm charts and Kubernetes manifests.
    

6. Configure Jenkins pipeline to integrate with Argo CD:
   6.1 Add the Argo CD API token to Jenkins credentials.
   6.2 Update the Jenkins pipeline to include the Argo CD deployment stage.

7. Run the Jenkins pipeline:
   7.1 Trigger the Jenkins pipeline to start the CI/CD process for the Java application.
   7.2 Monitor the pipeline stages and fix any issues that arise.

This end-to-end Jenkins pipeline will automate the entire CI/CD process for a Java application, from code checkout to production deployment, using popular tools like SonarQube, Argo CD and Kubernetes