Dockerfile

# Multi-stage build for smaller image size
FROM maven:3.9-eclipse-temurin-17 AS builder

WORKDIR /app

# Copy pom.xml first for dependency caching
COPY pom.xml ./

# Download dependencies (cached layer)
RUN mvn dependency:go-offline -B || true

# Copy source code
COPY src ./src

# Build the application
RUN mvn clean package -DskipTests

# Runtime stage
FROM eclipse-temurin:17-jre

WORKDIR /app

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

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

# Change ownership to non-root user
RUN chown spring:spring app.jar

USER spring:spring

# Expose port
EXPOSE 8080

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:8080/actuator/health || exit 1

# Run the application
ENTRYPOINT ["java", "-Djava.security.egd=file:/dev/./urandom", "-jar", "app.jar"]