DevOps Midterm Starter (Spring Boot + Jenkins + Nexus)

This repository contains a minimal Spring Boot app plus the CI/CD scaffolding you need to satisfy the midterm tasks:

1. Commit a Spring Boot project in Java into GitHub.
2. Use dockerized Jenkins to integrate with GitHub.
3. Write a Jenkinsfile with basic stages; build a fat jar during the build.
4. Run Nexus in Docker and publish the artifact to it.

Quick Start

# 1) Start Jenkins and Nexus (first time may take a few minutes)
docker compose up -d

# 2) Open Jenkins: http://localhost:8080  (admin user will be created interactively)
#    Open Nexus:   http://localhost:8081  (complete the first-run wizard)

Nexus Setup (once)

1. Sign in to Nexus (admin) and create two hosted repositories:
   • maven-releases (hosted)
   • maven-snapshots (hosted)
2. Make note of the admin username/password (or create a dedicated jenkins user).
3. In Jenkins, create Credentials → Username & Password with ID nexus-creds to match the Nexus user.

Jenkins Setup (once)

• Jenkins runs from the custom Docker image in jenkins/Dockerfile with JDK 17 and Maven preinstalled.
• Create a Pipeline job pointing to your GitHub repo URL (use a webhook or Poll SCM).
• Ensure the job uses this repository's Jenkinsfile.
• First run will build and attempt to deploy to Nexus.

Local build (optional)

# Run tests & package a fat jar locally
docker run --rm -v "$PWD":/ws -w /ws maven:3.9-eclipse-temurin-17 mvn -B clean package

Endpoints

• GET /api/hello → {"message":"Hello, DevOps!"}