Dockerfile

# Multi-stage build for Spring Boot application
# Stage 1: Build the application
FROM maven:3.9.9-eclipse-temurin-17 AS build

# Set working directory
WORKDIR /app

# Copy pom.xml and download dependencies (for better layer caching)
COPY pom.xml .
RUN mvn dependency:go-offline -B

# Copy source code
COPY src ./src

# Build the application (skip tests for faster builds)
RUN mvn clean package -DskipTests

# Stage 2: Create the runtime image
FROM eclipse-temurin:17-jre-jammy

# Set working directory
WORKDIR /app

# Create a non-root user for security
RUN groupadd -r spring && useradd -r -g spring spring

# Copy the built jar from the build stage
COPY --from=build /app/target/*.jar app.jar

# Change ownership to non-root user
RUN chown -R spring:spring /app

# Switch to non-root user
USER spring

# Expose the application port
EXPOSE 8080

# Set JVM options for better performance in containers
ENV JAVA_OPTS="-Xmx512m -Xms256m"

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=60s --retries=3 \
  CMD curl -f http://localhost:8080/actuator/health || exit 1

# Run the application
ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS -jar app.jar"]