Dockerfile

# Build stage
FROM eclipse-temurin:21-jdk-alpine AS builder

WORKDIR /app

# Copy Maven wrapper and pom.xml first (for layer caching)
COPY mvnw pom.xml ./
COPY .mvn .mvn

# Make mvnw executable and download dependencies
RUN chmod +x mvnw && ./mvnw dependency:go-offline -B

# Copy source code
COPY src src

# Build the application (skip tests for faster builds)
RUN ./mvnw clean package -DskipTests -B

# Runtime stage
FROM eclipse-temurin:21-jre-alpine

WORKDIR /app

# Add non-root user for security
RUN addgroup -g 1001 -S appgroup && \
    adduser -u 1001 -S appuser -G appgroup

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

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

# Switch to non-root user
USER appuser

# Expose the application port
EXPOSE 8080

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

# Run the application
ENTRYPOINT ["java", "-jar", "app.jar"]