notebook-containers-intro-sample-java-helloworld/Dockerfile.10.maven at develop · ebpro/notebook-containers-intro-sample-java-helloworld · GitHub

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# ============================================================
# Stage: Build & Run (Single-stage Maven)
# Purpose: Baseline development environment for Java 25
# ============================================================
FROM maven:3.9.16-eclipse-temurin-25-noble

# ------------------------------------------------------------
# Build Environment Configuration
# ------------------------------------------------------------
WORKDIR /app

ENV HOME=/home/appuser
ENV MAVEN_CONFIG=/home/appuser/.m2
ENV MAVEN_OPTS="-Dmaven.repo.local=/home/appuser/.m2"

LABEL maintainer="Emmanuel Bruno <emmanuel.bruno@univ-tln.fr>"
LABEL description="Java Hello World Application - Full Maven baseline"

# ------------------------------------------------------------
# Security: Unprivileged user creation
# ------------------------------------------------------------
RUN groupadd -r appgroup \
 && useradd -r -g appgroup -m -d /home/appuser appuser \
 && mkdir -p /home/appuser/.m2 \
 && chown -R appuser:appgroup /home/appuser \
 && chown -R appuser:appgroup /app

# ------------------------------------------------------------
# Layer 1: Dependency Caching
# ------------------------------------------------------------
# Copying only the wrapper and POM allows Docker to cache
# dependencies independently of source code changes.
COPY --chown=appuser:appgroup .mvn/ .mvn
COPY --chown=appuser:appgroup mvnw pom.xml ./

USER appuser

# Pre-resolve project dependencies to optimize build time
RUN ./mvnw dependency:resolve

# ------------------------------------------------------------
# Layer 2: Source Compilation
# ------------------------------------------------------------
COPY --chown=appuser:appgroup src ./src

# Build artifact using the 'jvm' profile (configured for thin JAR)
RUN ./mvnw clean package -DskipTests -Pjvm

# ------------------------------------------------------------
# Execution
# ------------------------------------------------------------

# Configure JVM container ergonomics for resource management
ENV JAVA_TOOL_OPTIONS="-XX:+UseContainerSupport -XX:MaxRAMPercentage=75.0"

# Explicitly invoke the JAR. The 'jvm' profile's Manifest
# automatically links to external dependencies in the /libs folder.
ENTRYPOINT ["java", "-jar", "/app/target/hello-world-0.1.0-SNAPSHOT.jar"]