This Spring Boot 4.0 application demonstrates:

1. H2 database integration
2. Flyway data migration
3. Docker containerization with multi-stage builds
4. Spring Boot Actuator for health monitoring
5. Security best practices for containerization

• Java 17 or later
• Docker Desktop (latest version)
• Maven 3.6+

# Clone the repository
git clone https://github.com/Arun4D/spring-boot-docker.git
cd spring-boot-docker

# Build and run locally
mvn clean install

PowerShell:

$env:DOCKER_BUILDKIT=1

Bash:

export DOCKER_BUILDKIT=1

# Build the Docker image
docker build -t spring-boot-docker:latest .

# Run the container
docker run -d \
  --name spring-boot-app \
  -p 8080:8080 \
  -e "SPRING_PROFILES_ACTIVE=default" \
  spring-boot-docker:latest

# Check container health
docker ps
docker logs spring-boot-app

• Multi-stage build for smaller final image
• Maven cache optimization
• Eclipse Temurin JDK 17 (recommended for Spring Boot 4.0)
• Security hardening with non-root user
• Built-in health checks
• Container-optimized JVM settings

Access the persons API:

http://localhost:8080/api/persons

http://localhost:8080/actuator/health

Access the H2 database console when running:

1. Locally:

http://localhost:8080/h2-console/

2. Docker:

http://localhost:8080/h2-console/

Database Connection Details:

JDBC URL    : jdbc:h2:mem:PersonDB
User Name   : sa
Password    : [leave empty]

• Application runs as non-root user (UID 1001)
• Container includes security hardening
• Uses OpenJDK (Eclipse Temurin) for better security updates
• Health checks enabled by default

1. View container logs:

docker logs spring-boot-app

2. Check container health:

docker inspect spring-boot-app | jq '.[0].State.Health'

3. Access container shell:

docker exec -it spring-boot-app sh

Open the browser and hit the following url to invoke the service.