package com.example.demo.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
class HelloController {
    @GetMapping("/hello")
    String sayHello(){
        return "hello world!";
    }
}

./gradlew build

plugins {
	id 'java'
	id 'org.springframework.boot' version '4.0.3'
	id 'io.spring.dependency-management' version '1.1.7'
	//id 'org.graalvm.buildtools.native' version '0.11.4'
}

./gradlew bootBuildImage --imageName=hello:normal

./gradlew bootBuildImage --imageName=hello:gralvm

FROM openjdk:25-jdk-slim
WORKDIR /app
RUN useradd -U spring
USER spring:spring
COPY build/libs/*.jar app.jar
EXPOSE 8080
CMD ["java", "-jar", "app.jar"]

docker build -t hello:openjdk -f deploy/openjdk.Dockerfile .

FROM eclipse-temurin:25-jdk-alpine AS jre-builder

RUN apk update && apk add binutils

RUN $JAVA_HOME/bin/jlink \
         --verbose \
         --add-modules java.base \
         --strip-debug \
         --no-man-pages \
         --no-header-files \
         --compress=2 \
         --output /optimized-jdk-25

FROM alpine:latest
ENV JAVA_HOME=/opt/jdk/jdk-25
ENV PATH="${JAVA_HOME}/bin:${PATH}"

COPY --from=jre-builder /optimized-jdk-25 $JAVA_HOME

RUN addgroup --system spring && adduser --system spring --ingroup spring

RUN mkdir /app && chown -R $APPLICATION_USER /app
COPY --chown=spring:spring build/libs/*.jar /app/app.jar
WORKDIR /app
USER spring
EXPOSE 8080
ENTRYPOINT [ "java", "-jar", "/app/app.jar" ]

docker build -t hello:alpine -f deploy/jlink.Dockerfile .

docker run -it -p 8080:8080 hello:alpine

docker run -it -p 8080:8080 --name alpine hello:alpine
docker run -it -p 9090:8080 --name graalvm hello:graalvm
docker stats