Libing Chen linux-china

Spring Boot application demo

This is a demo application with Spring Boot with DDD architecture, MySQL 8, Spring Data JDBC, Flyway for database migration.

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Highlights information that users should take into account, even when skimming.

Tip

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Important

Crucial information necessary for users to succeed.

[!WARNING]

	// after viper read config, replace all placeholders with values

	func ReplacePlaceHolders() {
	r, _ := regexp.Compile("\\${[a-zA-Z0-9.: _]+}")
	replacer := func(placeHolder []byte) []byte {
	name := string(placeHolder)
	name = name[2 : len(name)-1]
	index := strings.Index(name, ":")
	if index != -1 {
	defaultValue := name[index+1:]

	//usr/bin/env jbang "$0" "$@" ; exit $?
	//JAVA 21
	//DEPS org.junit.jupiter:junit-jupiter-engine:5.10.1
	//DEPS org.junit.platform:junit-platform-console:1.9.3
	//DEPS org.assertj:assertj-core:3.25.1

	package com.example;

	import org.junit.jupiter.api.Test;
	import org.junit.platform.console.options.CommandLineOptions;

	FROM linuxchina/jbang-action as builder

	ARG mainClass="Hello2.java"

	RUN mkdir -p /opt/app/out
	WORKDIR /opt/app

	COPY $mainClass /opt/app

	RUN jbang export portable -O out/app.jar $mainClass

	FROM linuxchina/jbang-action:0.94.0-graal-java17-22.1.0 as builder

	ARG mainClass="Hello2.java"

	RUN mkdir -p /opt/app/out
	WORKDIR /opt/app

	COPY $mainClass /opt/app

	RUN jbang export portable --native -O out/main $mainClass

	import jdk.jfr.consumer.RecordingStream;
	import org.springframework.messaging.handler.annotation.MessageMapping;
	import org.springframework.stereotype.Controller;
	import reactor.core.publisher.Flux;

	import java.time.Duration;
	import java.time.Instant;
	import java.time.temporal.ChronoUnit;

	@Controller

	{
	"$schema": "http://json-schema.org/draft-07/schema#",
	"title": "JBang catalogs JSON Schema",
	"description": "JSON Schema for jbang-catalog.json",
	"type": "object",
	"properties": {
	"aliases": {
	"description": "aliases",
	"type": "object",
	"additionalProperties": {

	#!/usr/bin/env bash

	# https://medium.com/codex/a-bash-template-cheat-sheet-is-very-useful-f8207b442e78
	set -Eeuo pipefail

	# Define variables
	readonly dir="$(dirname "$0")"

	# Usage or Help message
	usage() {

	///usr/bin/env jbang "$0" "$@" ; exit $?
	//DEPS io.netty.incubator:netty-incubator-transport-native-io_uring:0.0.5.Final:linux-x86_64

	import io.netty.incubator.channel.uring.IOUring;

	public class HelloIoUring {
	public static void main(String[] args) {
	IOUring.ensureAvailability();
	System.out.println("Hello io_uring!");
	}