Java Hello World Web Server - Enterprise CI/CD Pipeline

A comprehensive Java web server application with enterprise-grade CI/CD pipeline featuring environment separation, approval gates, and automated deployments.

Project Overview

This project demonstrates an enterprise-grade DevOps pipeline that:

Builds a simple Java HTTP server
Containerizes it using Docker
Deploys across multiple environments (Development → Staging → Production)
Includes comprehensive testing, health checks, and approval gates
Features automated notifications and rollback capabilities

Project Structure

Github-Action-POC/
├── .github/workflows/
│   ├── ci-build.yml               # CI: Build, test, publish images
│   ├── pr-validation.yml          # PR: Validation workflow for pull requests
│   ├── deploy-dev.yml             # Deploy to development environment
│   ├── deploy-production.yml      # Deploy to production (manual with approval)
│   └── docker-build-deploy.yml    # Legacy workflow (deprecated)
├── k8s/
│   ├── namespace.yaml             # Kubernetes namespace definition
│   ├── deployment.yaml            # Kubernetes deployment configuration
│   ├── service.yaml               # Kubernetes service (LoadBalancer)
│   └── ingress.yaml               # Kubernetes ingress routing
├── Dockerfile                     # Docker container configuration
├── HelloWorldServer.java          # Java web server application
├── DEPLOYMENT_GUIDE.md            # Enterprise deployment guide
└── README.md                      # This documentation file

File-by-File Code Analysis

1. HelloWorldServer.java - Java Web Server Application

This file contains the main Java application that creates an HTTP server.

import com.sun.net.httpserver.HttpServer;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpExchange;
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;

Lines 1-6: Import statements for Java's built-in HTTP server functionality:

HttpServer: Creates and manages the HTTP server
HttpHandler: Interface for handling HTTP requests
HttpExchange: Represents an HTTP request-response exchange
IOException: Exception handling for I/O operations
OutputStream: For writing response data
InetSocketAddress: For specifying server address and port

public class HelloWorldServer {

Line 8: Class declaration for the main server class

    public static void main(String[] args) throws IOException {

Line 9: Main method entry point, declares IOException to handle network errors

        HttpServer server = HttpServer.create(new InetSocketAddress(8080), 0);

Line 10: Creates HTTP server instance:

HttpServer.create(): Factory method to create server
new InetSocketAddress(8080): Binds server to port 8080 on all interfaces
0: Uses default backlog (maximum number of incoming connections)

        server.createContext("/", new HelloWorldHandler());

Line 11: Maps the root path "/" to HelloWorldHandler class for request processing

        server.setExecutor(null);

Line 12: Uses default executor (creates thread pool automatically for handling requests)

        System.out.println("Server started on http://localhost:8080");

Line 13: Prints startup message to console for debugging

        server.start();

Line 14: Starts the HTTP server (non-blocking call)

    static class HelloWorldHandler implements HttpHandler {

Line 17: Inner static class that implements HttpHandler interface for request processing

        @Override
        public void handle(HttpExchange exchange) throws IOException {

Line 19: Override method that handles all HTTP requests to the "/" context

            String response = """
                <!DOCTYPE html>
                <html>
                <head>
                    <title>Hello World Java App</title>
                    <style>
                        body { font-family: Arial, sans-serif; text-align: center; margin-top: 100px; }
                        h1 { color: #333; font-size: 3em; }
                    </style>
                </head>
                <body>
                    <h1>Hello! World</h1>
                    <p>Java application running in Docker with Ubuntu</p>
                </body>
                </html>
                """;

Lines 20-35: Text block (Java 15+ feature) containing HTML response:

Complete HTML document with DOCTYPE declaration
CSS styling for centered layout with Arial font
Main heading "Hello! World" in large gray text
Descriptive paragraph about the application environment

            exchange.getResponseHeaders().set("Content-Type", "text/html");

Line 37: Sets HTTP response header to indicate HTML content type

            exchange.sendResponseHeaders(200, response.getBytes().length);

Line 38: Sends HTTP response headers:

200: HTTP OK status code
response.getBytes().length: Content length in bytes

            OutputStream os = exchange.getResponseBody();
            os.write(response.getBytes());
            os.close();

Lines 39-41: Writes response body and closes the output stream:

Gets output stream from the exchange
Writes HTML response as bytes
Closes stream to complete the response

2. Dockerfile - Container Configuration

This file defines how to build the Docker container for the Java application.

# Use Ubuntu as base image
FROM ubuntu:22.04

Lines 1-2:

Comment explaining base image choice
Uses Ubuntu 22.04 LTS as the foundation (stable, long-term support)

# Set environment variables
ENV DEBIAN_FRONTEND=noninteractive

Lines 4-5:

Comment describing environment setup
Prevents interactive prompts during package installation

# Update package list and install OpenJDK 17
RUN apt-get update && \
    apt-get install -y openjdk-17-jdk && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

Lines 7-11: Multi-line RUN command for Java installation:

apt-get update: Updates package repository lists
apt-get install -y openjdk-17-jdk: Installs Java 17 JDK (LTS version)
apt-get clean: Removes downloaded package files
rm -rf /var/lib/apt/lists/*: Deletes cached package lists to reduce image size

# Set JAVA_HOME
ENV JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64

Lines 13-14:

Comment explaining Java environment setup
Sets JAVA_HOME environment variable for Java applications

# Create app directory
WORKDIR /app

Lines 16-17:

Comment describing working directory creation
Sets /app as the working directory for subsequent commands

# Copy Java source file
COPY HelloWorldServer.java .

Lines 19-20:

Comment explaining file copy operation
Copies Java source file from host to container's /app directory

# Compile Java application
RUN javac HelloWorldServer.java

Lines 22-23:

Comment describing compilation step
Compiles Java source code into bytecode (.class file)

# Expose port 8080
EXPOSE 8080

Lines 25-26:

Comment explaining port exposure
Documents that container listens on port 8080 (metadata for Docker)

# Run the web server
CMD ["java", "HelloWorldServer"]

Lines 28-29:

Comment describing container startup command
Executes Java application when container starts (exec form for better signal handling)

3. Enterprise CI/CD Pipeline (.github/workflows/)

This project now uses an enterprise-grade CI/CD pipeline with multiple workflows for different purposes:

3.1 PR Build Validation (pr-validation.yml)

Purpose: Validates pull requests before merging Triggers: Pull requests to main/develop branches only

3.2 CI Build (ci-build.yml)

Purpose: Builds, tests, scans, and publishes images Triggers: Push to main, develop, feature/, hotfix/ branches (NOT PRs)

3.3 Development Deployment (deploy-dev.yml)

Purpose: Auto-deploy to development environment Triggers: Push to develop branch, manual dispatch

3.4 Production Deployment (deploy-production.yml)

Purpose: Controlled production deployments with approval gates Triggers: Manual dispatch only

3.6 Legacy Workflow (docker-build-deploy.yml)

This file has been DEPRECATED and disabled to prevent accidental production deployments.

name: Build and Deploy to Docker Hub and Kubernetes

Line 1: Workflow name displayed in GitHub Actions interface

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main

Lines 2-8: Trigger configuration:

Runs on pushes to main branch
Runs on pull requests targeting main branch
Ensures code is tested before merging

env:
  DOCKER_IMAGE_NAME: java-hello-world

Lines 10-11: Environment variables:

Defines Docker image name used throughout the workflow
Centralized configuration for easy maintenance

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest

Lines 13-15: Job configuration:

Single job named "build-and-deploy"
Runs on latest Ubuntu runner (GitHub-hosted)

    steps:
    - name: Checkout code
      uses: actions/checkout@v4

Lines 17-19: First step - source code checkout:

Uses official GitHub action to download repository code
v4 is the latest stable version

    - name: Set up Java JDK 17
      uses: actions/setup-java@v4
      with:
        java-version: '17'
        distribution: 'temurin'

Lines 21-25: Java environment setup:

Uses official Java setup action
Installs Java 17 (LTS version matching Dockerfile)
Uses Eclipse Temurin distribution (open-source OpenJDK)

    - name: Compile Java application
      run: javac HelloWorldServer.java

Lines 27-28: Java compilation step:

Compiles source code to verify it builds correctly
Catches compilation errors before Docker build

    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v3

Lines 30-31: Docker Buildx setup:

Enables advanced Docker build features
Required for multi-platform builds

    - name: Log in to Docker Hub
      uses: docker/login-action@v3
      with:
        username: ${{ secrets.DOCKER_HUB_USERNAME }}
        password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}

Lines 33-37: Docker Hub authentication:

Uses official Docker login action
Credentials stored as GitHub repository secrets
Access token used instead of password for security

    - name: Extract metadata
      id: meta
      uses: docker/metadata-action@v5
      with:
        images: ${{ secrets.DOCKER_HUB_USERNAME }}/${{ env.DOCKER_IMAGE_NAME }}
        tags: |
          type=ref,event=branch
          type=ref,event=pr
          type=sha,prefix=commit-
          type=raw,value=latest,enable={{is_default_branch}}

Lines 39-48: Docker image metadata generation:

Creates tags and labels for Docker image
type=ref,event=branch: Tags with branch name
type=ref,event=pr: Tags with PR number
type=sha,prefix=commit-: Tags with Git commit SHA
type=raw,value=latest: Tags as "latest" only on main branch

    - name: Build and push Docker image
      id: build
      uses: docker/build-push-action@v5
      with:
        context: .
        file: ./Dockerfile
        push: true
        tags: ${{ steps.meta.outputs.tags }}
        labels: ${{ steps.meta.outputs.labels }}
        platforms: linux/amd64,linux/arm64

Lines 50-59: Docker build and push:

Builds Docker image using Dockerfile
Pushes to Docker Hub with generated tags
Supports multiple architectures (AMD64 and ARM64)
Uses build context from repository root

    - name: Set up kubectl
      uses: azure/setup-kubectl@v3
      with:
        version: 'v1.28.0'

Lines 61-64: Kubernetes CLI setup:

Installs kubectl for Kubernetes operations
Uses specific version for consistency

    - name: Configure kubectl
      run: |
        mkdir -p ~/.kube
        printf '%s\n' "${{ secrets.KUBE_CONFIG }}" > ~/.kube/config
        chmod 600 ~/.kube/config

Lines 66-70: Kubernetes configuration:

Creates kubectl configuration directory
Writes base64-encoded kubeconfig from secrets
Sets secure file permissions (owner read/write only)

    - name: Update Kubernetes deployment image
      run: |
        # Replace IMAGE_PLACEHOLDER with actual image
        sed -i "s|IMAGE_PLACEHOLDER|${{ secrets.DOCKER_HUB_USERNAME }}/${{ env.DOCKER_IMAGE_NAME }}:latest|g" k8s/deployment.yaml

Lines 73-76: Dynamic image reference update:

Uses sed command to replace placeholder with actual image name
Enables template-based deployment configuration
Updates deployment.yaml with built image reference

    - name: Deploy to Kubernetes
      run: |
        kubectl apply -f k8s/namespace.yaml
        kubectl apply -f k8s/deployment.yaml
        kubectl apply -f k8s/service.yaml
        kubectl apply -f k8s/ingress.yaml

Lines 78-83: Kubernetes deployment:

Applies all Kubernetes manifests in order
Creates namespace, deployment, service, and ingress
Uses declarative configuration approach

    - name: Wait for deployment
      run: |
        kubectl wait --for=condition=available --timeout=300s deployment/java-hello-world -n java-hello-world

Lines 85-87: Deployment verification:

Waits for deployment to become available
300-second timeout prevents infinite waiting
Ensures pods are running before continuing

    - name: Get deployment status
      run: |
        kubectl get pods -n java-hello-world
        kubectl get services -n java-hello-world
        kubectl get ingress -n java-hello-world

Lines 89-93: Status reporting:

Shows running pods in the namespace
Displays service configuration and external IPs
Shows ingress routing rules

    - name: Deploy summary
      run: |
        echo "## Deployment Summary" >> $GITHUB_STEP_SUMMARY
        echo "Java web server application compiled successfully" >> $GITHUB_STEP_SUMMARY
        echo "Docker image built and pushed to Docker Hub" >> $GITHUB_STEP_SUMMARY
        echo "Application deployed to Kubernetes cluster" >> $GITHUB_STEP_SUMMARY
        echo "**Image:** \`${{ secrets.DOCKER_HUB_USERNAME }}/${{ env.DOCKER_IMAGE_NAME }}:latest\`" >> $GITHUB_STEP_SUMMARY
        echo "**Docker Hub:** https://hub.docker.com/r/${{ secrets.DOCKER_HUB_USERNAME }}/${{ env.DOCKER_IMAGE_NAME }}" >> $GITHUB_STEP_SUMMARY
        echo "**Kubernetes:** Deployed to namespace \`java-hello-world\`" >> $GITHUB_STEP_SUMMARY

Lines 95-103: Deployment summary creation:

Creates formatted summary for GitHub Actions interface
Uses GitHub-flavored Markdown for rich formatting
Includes links and status indicators
Provides deployment details for team visibility

    - name: Notify Slack on successful build
      if: success() && github.ref == 'refs/heads/main'
      uses: 8398a7/action-slack@v3
      with:
        status: success
        text: |
          ✅ Build and deployment completed successfully!
          
          **Repository:** ${{ github.repository }}
          **Branch:** ${{ github.ref_name }}
          **Commit:** ${{ github.sha }}
          **Author:** ${{ github.actor }}
          **Image:** ${{ secrets.DOCKER_HUB_USERNAME }}/${{ env.DOCKER_IMAGE_NAME }}:latest
          **Kubernetes:** Deployed to namespace `java-hello-world`
      env:
        SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}

Lines 105-120: Slack success notification:

Triggers only on successful builds to main branch
Uses community Slack action for webhook integration
Includes comprehensive deployment information
Formatted with emojis and markdown for readability

    - name: Notify Slack on build failure
      if: failure() && github.ref == 'refs/heads/main'
      uses: 8398a7/action-slack@v3
      with:
        status: failure
        text: |
          ❌ Build or deployment failed!
          
          **Repository:** ${{ github.repository }}
          **Branch:** ${{ github.ref_name }}
          **Commit:** ${{ github.sha }}
          **Author:** ${{ github.actor }}
          **Workflow:** ${{ github.workflow }}
          
          Please check the GitHub Actions logs for details.
      env:
        SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}

Lines 122-137: Slack failure notification:

Triggers only on failed builds to main branch
Provides essential debugging information
Directs users to GitHub Actions logs for troubleshooting
Uses webhook URL stored in repository secrets

4. Kubernetes Manifests (k8s/ directory)

4.1 namespace.yaml - Kubernetes Namespace

apiVersion: v1
kind: Namespace
metadata:
  name: java-hello-world
  labels:
    name: java-hello-world

Line 1: Kubernetes API version for core resources Line 2: Resource type - Namespace for logical separation Line 4: Namespace name used across all resources Line 6: Label for resource identification and selection

4.2 deployment.yaml - Application Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: java-hello-world
  namespace: java-hello-world
  labels:
    app: java-hello-world

Lines 1-7: Deployment metadata:

Uses apps/v1 API for deployment resources
Defines deployment name and target namespace
Labels enable resource grouping and selection

spec:
  replicas: 3

Lines 8-9: Deployment specification:

Creates 3 identical pod replicas for high availability
Enables load distribution and fault tolerance

  selector:
    matchLabels:
      app: java-hello-world

Lines 10-12: Pod selector:

Defines which pods this deployment manages
Matches pods with "app: java-hello-world" label

  template:
    metadata:
      labels:
        app: java-hello-world

Lines 13-16: Pod template metadata:

Template for creating pods
Labels must match selector for proper management

    spec:
      containers:
      - name: java-hello-world
        image: IMAGE_PLACEHOLDER
        ports:
        - containerPort: 8080

Lines 17-22: Container specification:

Single container per pod
Image placeholder replaced during deployment
Exposes port 8080 for HTTP traffic

        resources:
          requests:
            memory: "256Mi"
            cpu: "250m"
          limits:
            memory: "512Mi"
            cpu: "500m"

Lines 23-29: Resource management:

requests: Minimum guaranteed resources
limits: Maximum allowed resources
Prevents resource starvation and overconsumption

        livenessProbe:
          httpGet:
            path: /
            port: 8080
          initialDelaySeconds: 30
          periodSeconds: 10

Lines 30-35: Liveness probe configuration:

Checks if container is alive by HTTP GET to "/"
Waits 30 seconds before first check (startup time)
Checks every 10 seconds thereafter
Kubernetes restarts container if probe fails

        readinessProbe:
          httpGet:
            path: /
            port: 8080
          initialDelaySeconds: 5
          periodSeconds: 5

Lines 36-41: Readiness probe configuration:

Checks if container is ready to receive traffic
Shorter delays than liveness probe
Kubernetes removes pod from service if probe fails
Faster recovery for temporary issues

4.3 service.yaml - Load Balancer Service

apiVersion: v1
kind: Service
metadata:
  name: java-hello-world-service
  namespace: java-hello-world
  labels:
    app: java-hello-world

Lines 1-7: Service metadata:

Core API version for service resources
Service name used by other resources
Same namespace and labels as deployment

spec:
  type: LoadBalancer
  ports:
  - port: 80
    targetPort: 8080
    protocol: TCP
    name: http

Lines 8-14: Service specification:

LoadBalancer: Provisions external load balancer (cloud provider)
Maps external port 80 to container port 8080
TCP protocol for HTTP traffic
Named port for reference in other resources

  selector:
    app: java-hello-world

Lines 15-16: Pod selector:

Routes traffic to pods with matching label
Load balances across all healthy replicas

4.4 ingress.yaml - HTTP Routing

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: java-hello-world-ingress
  namespace: java-hello-world
  annotations:
    kubernetes.io/ingress.class: "nginx"
    nginx.ingress.kubernetes.io/rewrite-target: /

Lines 1-8: Ingress metadata and annotations:

Networking API for ingress resources
Nginx ingress controller configuration
Rewrites incoming paths to root path "/"

spec:
  rules:
  - host: java-hello-world.local
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: java-hello-world-service
            port:
              number: 80

Lines 9-20: Ingress routing rules:

Routes requests for "java-hello-world.local" host
Matches all paths starting with "/" (prefix match)
Forwards traffic to the LoadBalancer service on port 80
Enables hostname-based routing and SSL termination

Quick Start Guide

Prerequisites

Java 17 or higher
Docker (for containerization)
kubectl (for Kubernetes deployment)
Access to Kubernetes cluster

Local Development

# Compile and run locally
javac HelloWorldServer.java
java HelloWorldServer
# Visit http://localhost:8080

Docker Deployment

# Build Docker image
docker build -t java-hello-world .

# Run container
docker run -p 8080:8080 java-hello-world

Kubernetes Deployment

# Deploy all resources
kubectl apply -f k8s/

# Check deployment status
kubectl get all -n java-hello-world

# Get service external IP
kubectl get service java-hello-world-service -n java-hello-world

Enterprise CI/CD Features

Environment Separation

Development: Auto-deploy on develop branch pushes
Production: Manual deployment with approval gates

Security & Quality Gates

Manual Approval Gates: Production requires team approval
Blue-Green Deployments: Zero-downtime production updates
Automatic Rollbacks: Health check failures trigger rollbacks

Workflow Trigger Matrix

Action	Triggered Workflows
Push to `develop`	CI Build → Development Deployment
Push to `main`	CI Build only
Push to `feature/*`	CI Build only
Push to `hotfix/*`	CI Build only
PR to `main/develop`	PR Build Validation only
Manual production deploy	Production Deployment

GitHub Actions Setup

Required Repository Secrets

GITHUB_TOKEN - Automatically provided for container registry
KUBE_CONFIG_DEV - Development cluster kubeconfig (base64-encoded)
KUBE_CONFIG_PROD - Production cluster kubeconfig (base64-encoded)
SLACK_WEBHOOK_URL - Slack webhook URL for deployment notifications

Required GitHub Environments

Create these environments in your repository settings with appropriate protection rules:

development - No protection needed
production-approval - Require approvers (team leads)
production - Require approvers (senior engineers)

Getting Kubernetes Config

# Encode your kubeconfig
cat ~/.kube/config | base64 -w 0

Setting up Slack Webhook

Go to your Slack workspace
Navigate to Apps → Incoming Webhooks
Create a new webhook for your desired channel
Copy the webhook URL (format: https://hooks.slack.com/services/T.../B.../...)
Add it as SLACK_WEBHOOK_URL secret in your GitHub repository

Slack Notifications

The enterprise pipeline sends comprehensive Slack notifications for:

✅ Successful deployments to all environments
❌ Failed deployments with debugging information
🚀 Production deployments with special formatting
📋 PR validation results for team visibility

Notifications include:

Environment and deployment details
Image tags and commit information
Health check results and deployment status
Direct links to GitHub Actions logs

Architecture Overview

Enterprise Pipeline Flow

Feature Development: Push to feature branches triggers CI builds only
Pull Request Validation: PRs trigger validation workflow with comprehensive testing
Development Deployment: Merge to develop → Auto-deploy to dev environment
Production Deployment: Manual trigger with approval gates and blue-green strategy
Monitoring & Notifications: Health checks and Slack notifications

Enterprise Features

Environment Separation: Isolated development and production environments
Approval Gates: Manual approvals for production changes
Zero Downtime: Blue-green deployments with automatic rollback
Comprehensive Testing: Unit tests, integration tests, load tests
Observability: Detailed logging, metrics, and notifications
Multi-platform Support: AMD64 and ARM64 architectures
Container Registry: GitHub Container Registry with proper authentication

Troubleshooting

Common Issues

Port conflicts: Change port in Java code and Dockerfile
Resource limits: Adjust requests/limits in deployment.yaml
Image pull errors: Verify Docker Hub credentials and image name
Service unavailable: Check pod status and health probes
Ingress not working: Verify ingress controller and DNS configuration

Debugging Commands

# Check pod logs
kubectl logs -f deployment/java-hello-world -n java-hello-world

# Describe deployment for events
kubectl describe deployment java-hello-world -n java-hello-world

# Check service endpoints
kubectl get endpoints java-hello-world-service -n java-hello-world

# Test connectivity
kubectl port-forward service/java-hello-world-service 8080:80 -n java-hello-world

Quick Start with Enterprise Pipeline

1. Initial Setup

# Clone repository
git clone <repository-url>
cd Github-Action-POC

# Create develop branch
git checkout -b develop
git push -u origin develop

2. Configure GitHub

Set up required secrets and environments (see GitHub Actions Setup section)
Configure branch protection rules for main and develop
Set up required approvers for production environment

3. Development Workflow

# Create feature branch
git checkout -b feature/my-new-feature

# Make changes and push (triggers CI build only)
git add .
git commit -m "Add new feature"
git push -u origin feature/my-new-feature

# Create PR to develop (triggers PR validation)
# After review, merge to develop (triggers dev deployment)

# Create PR from develop to main (triggers PR validation) 
# After review, merge to main (triggers CI build only)

# For production: Use GitHub Actions UI to manually deploy

4. Production Deployment

Go to Actions → Deploy to Production
Click Run workflow
Enter image tag (e.g., latest commit SHA from main branch)
Wait for approvals and monitor deployment

Migration Guide

If migrating from the old single workflow:

Review the DEPLOYMENT_GUIDE.md for complete setup instructions
The old workflow has been disabled - only runs on manual emergency trigger
Test the new pipeline in development first
Gradually migrate to the new branching strategy

This documentation provides a complete understanding of the enterprise-grade CI/CD pipeline, enabling teams to develop, test, and deploy applications safely and efficiently across multiple environments.

Name		Name	Last commit message	Last commit date
Latest commit History 27 Commits
.github/workflows		.github/workflows
k8s		k8s
DEPLOYMENT_GUIDE.md		DEPLOYMENT_GUIDE.md
Dockerfile		Dockerfile
HelloWorldServer.java		HelloWorldServer.java
README.md		README.md

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Java Hello World Web Server - Enterprise CI/CD Pipeline

Project Overview

Project Structure

File-by-File Code Analysis

1. HelloWorldServer.java - Java Web Server Application

2. Dockerfile - Container Configuration

3. Enterprise CI/CD Pipeline (.github/workflows/)

3.1 PR Build Validation (pr-validation.yml)

3.2 CI Build (ci-build.yml)

3.3 Development Deployment (deploy-dev.yml)

3.4 Production Deployment (deploy-production.yml)

3.6 Legacy Workflow (docker-build-deploy.yml)

4. Kubernetes Manifests (k8s/ directory)

4.1 namespace.yaml - Kubernetes Namespace

4.2 deployment.yaml - Application Deployment

4.3 service.yaml - Load Balancer Service

4.4 ingress.yaml - HTTP Routing

Quick Start Guide

Prerequisites

Local Development

Docker Deployment

Kubernetes Deployment

Enterprise CI/CD Features

Environment Separation

Security & Quality Gates

Workflow Trigger Matrix

GitHub Actions Setup

Required Repository Secrets

Required GitHub Environments

Getting Kubernetes Config

Setting up Slack Webhook

Slack Notifications

Architecture Overview

Enterprise Pipeline Flow

Enterprise Features

Troubleshooting

Common Issues

Debugging Commands

Quick Start with Enterprise Pipeline

1. Initial Setup

2. Configure GitHub

3. Development Workflow

4. Production Deployment

Migration Guide

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