Java Hello World — Docker Samples

Lightweight repository demonstrating multiple strategies to package a Java application as a container image (single-stage Maven, multi-stage, cache-optimized, jlink and GraalVM native).

Contents

• Dockerfiles: Dockerfile.01.mavenimage, Dockerfile.02.mavenimagestage, Dockerfile.03.dockercache, Dockerfile.05.manual, Dockerfile.06.jlink, Dockerfile.06b.jlink-alpine, Dockerfile.07.graalVM
• Helper scripts: entrypoint.sh, build_and_run_all.sh, benchmark.sh
• Maven project with profiles: prod, jlink, native

Prerequisites

• Docker or Podman available on PATH (rootless or rootful)
• Java / Maven (only needed for local builds outside Docker)

Quick start

Build and run all images sequentially (script uses docker):

./build_and_run_all.sh

Build a single image manually:

# build and run JVM multi-stage image
docker build -t javahello:mavenimagestage -f Dockerfile.02.mavenimagestage .
docker run --rm javahello:mavenimagestage

# build jlink image
docker build -t javahello:jlink -f Dockerfile.06.jlink .
docker run --rm javahello:jlink

If you use Podman, replace docker by podman in the commands above.

Benchmark

Run the included benchmark that measures build/runtime characteristics:

./benchmark.sh

License

MIT