Dockerfile.layered

FROM maven:3.9-eclipse-temurin-17 AS builder

WORKDIR /app

# Copy dependencies configuration first for better caching
COPY pom.xml .
RUN mvn dependency:go-offline -B

# Copy and build source code
COPY src ./src
RUN mvn clean package -DskipTests -B

FROM eclipse-temurin:17-jre-alpine

# Install minimal packages and create user
RUN addgroup -g 1001 -S appuser && \
    adduser -S appuser -G appuser -u 1001

WORKDIR /app
USER appuser

# Copy the built JAR with proper ownership
COPY --from=builder --chown=appuser:appuser /app/target/order-service-*.jar app.jar

# Container-optimized JVM settings
ENV JAVA_OPTS="-XX:+UseContainerSupport \
    -XX:MaxRAMPercentage=75.0 \
    -XX:+UseG1GC \
    -XX:MaxGCPauseMillis=100 \
    -Djava.security.egd=file:/dev/./urandom"

EXPOSE 8080
ENTRYPOINT ["dumb-init", "--"]

CMD ["sh", "-c", "java $JAVA_OPTS -jar app.jar"]