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Java Microservice Dockerfile

Source: docker/java-microservice/Dockerfile

Dockerfile​

FROM maven:3.8.8-eclipse-temurin-17 AS builder
WORKDIR /workspace
COPY pom.xml mvnw ./
COPY .mvn .mvn
RUN mvn -B -DskipTests dependency:go-offline
COPY src ./src
RUN mvn -B -DskipTests package

FROM eclipse-temurin:17-jdk-jammy
WORKDIR /app
COPY --from=builder /workspace/target/*.jar /app/app.jar
EXPOSE 8080
ENTRYPOINT ["java","-jar","/app/app.jar"]

What It Does​

  • Resolves dependencies and builds a JAR with Maven.
  • Copies the built JAR into a Java 17 runtime image.
  • Starts the app on port 8080.

Required Files In Build Context​

  • pom.xml
  • mvnw
  • .mvn/
  • src/

Docker Compose Example​

version: '3.8'
services:
  app:
    build:
      context: .
      dockerfile: docker/java-microservice/Dockerfile
    container_name: java-microservice
    env_file:
      - .env
    environment:
      - SPRING_PROFILES_ACTIVE=prod
    ports:
      - "8080:8080"
    depends_on:
      - db
    restart: unless-stopped

  db:
    image: postgres:15-alpine
    container_name: java-db
    environment:
      - POSTGRES_DB=appdb
      - POSTGRES_USER=app
      - POSTGRES_PASSWORD=password
    volumes:
      - postgres_data:/var/lib/postgresql/data
    restart: unless-stopped

volumes:
  postgres_data:

Other Files You Need​

  • .env with application and datasource values
  • src/main/resources/application.properties or application.yml
  • Database migration setup (Flyway/Liquibase) if used

Build (Docker)​

docker build -t java-microservice -f docker/java-microservice/Dockerfile .

Run (Docker)​

docker run --rm -p 8080:8080 java-microservice

Run (Docker Compose)​

docker compose up --build -d