How to Use Spring Boot and JHipster With Reactive Java Microservices

Learn how to create a reactive microservices architecture with Spring Boot, Spring Cloud Gateway, Spring Cloud Config, Spring WebFlux, Java, and JHipster.

Even though it only came to prominence a few years ago, Java has been at the forefront of microservice architecture. Spring Cloud, Spring Data, and Spring Security, Java are well-known high-quality frameworks.

Spring WebFlux is a new web framework introduced by Spring Boot 2.0. While previous versions of Spring Boot only shipped with Spring MVC as an option, WebFlux gives the developers the chance to do reactive programming, meaning you can write your code with familiar syntax. As a result, your app will scale better and use up fewer resources.

#java #tutorial #spring boot #java microservice #microservices

What is GEEK

Buddha Community

How to Use Spring Boot and JHipster With Reactive Java Microservices

Mike Kozey

1615894080

How to Use Spring Boot and JHipster With Reactive Java Microservices

Learn how to create a reactive microservices architecture with Spring Boot, Spring Cloud Gateway, Spring Cloud Config, Spring WebFlux, Java, and JHipster.

Even though it only came to prominence a few years ago, Java has been at the forefront of microservice architecture. Spring Cloud, Spring Data, and Spring Security, Java are well-known high-quality frameworks.

Spring WebFlux is a new web framework introduced by Spring Boot 2.0. While previous versions of Spring Boot only shipped with Spring MVC as an option, WebFlux gives the developers the chance to do reactive programming, meaning you can write your code with familiar syntax. As a result, your app will scale better and use up fewer resources.

#java #tutorial #spring boot #java microservice #microservices

Tyrique Littel

1600135200

How to Install OpenJDK 11 on CentOS 8

What is OpenJDK?

OpenJDk or Open Java Development Kit is a free, open-source framework of the Java Platform, Standard Edition (or Java SE). It contains the virtual machine, the Java Class Library, and the Java compiler. The difference between the Oracle OpenJDK and Oracle JDK is that OpenJDK is a source code reference point for the open-source model. Simultaneously, the Oracle JDK is a continuation or advanced model of the OpenJDK, which is not open source and requires a license to use.

In this article, we will be installing OpenJDK on Centos 8.

#tutorials #alternatives #centos #centos 8 #configuration #dnf #frameworks #java #java development kit #java ee #java environment variables #java framework #java jdk #java jre #java platform #java sdk #java se #jdk #jre #open java development kit #open source #openjdk #openjdk 11 #openjdk 8 #openjdk runtime environment

Spring Framework

1642110180

Spring: A Static Web Site Generator Written By GitHub Issues

Spring

Spring is a blog engine written by GitHub Issues, or is a simple, static web site generator. No more server and database, you can setup it in free hosting with GitHub Pages as a repository, then post the blogs in the repository Issues.

You can add some labels in your repository Issues as the blog category, and create Issues for writing blog content through Markdown.

Spring has responsive templates, looking good on mobile, tablet, and desktop.Gracefully degrading in older browsers. Compatible with Internet Explorer 10+ and all modern browsers.

Get up and running in seconds.

中文介绍

Quick start guide

For the impatient, here's how to get a Spring blog site up and running.

First of all

Fork the Spring repository as yours.
Goto your repository settings page to rename Repository Name.
Hosted directly on GitHub Pages from your project repository, you can take it as User or organization site or Project site(create a gh-pages branch).
Also, you can set up a custom domain with Pages.

Secondly

Open the index.html file to edit the config variables with yours below.

$.extend(spring.config, {
  // my blog title
  title: 'Spring',
  // my blog description
  desc: "A blog engine written by github issues [Fork me on GitHub](https://github.com/zhaoda/spring)",
  // my github username
  owner: 'zhaoda',
  // creator's username
  creator: 'zhaoda',
  // the repository name on github for writting issues
  repo: 'spring',
  // custom page
  pages: [
  ]
})

Put your domain into the CNAME file if you have.
Commit your change and push it.

And then

Goto your repository settings page to turn on the Issues feature.
Browser this repository's issues page, like this https://github.com/your-username/your-repo-name/issues?state=open.
Click the New Issue button to just write some content as a new one blog.

Finally

Browser this repository's GitHub Pages url, like this http://your-username.github.io/your-repo-name, you will see your Spring blog, have a test.
And you're done!

Custom development

Installation

You will need a web server installed on your system, for example, Nginx, Apache etc.
Configure your spring project to your local web server directory.
Run and browser it, like http://localhost/spring/dev.html .
dev.html is used to develop, index.html is used to runtime.

Folder Structure

spring/
├── css/
|    ├── boot.less  #import other less files
|    ├── github.less  #github highlight style
|    ├── home.less  #home page style
|    ├── issuelist.less #issue list widget style
|    ├── issues.less #issues page style
|    ├── labels.less #labels page style
|    ├── main.less #commo style
|    ├── markdown.less #markdown format style
|    ├── menu.less #menu panel style
|    ├── normalize.less #normalize style
|    ├── pull2refresh.less #pull2refresh widget style
|    └── side.html  #side panel style
├── dist/
|    ├── main.min.css  #css for runtime
|    └── main.min.js  #js for runtime
├── img/  #some icon, startup images
├── js/
|    ├── lib/  #some js librarys need to use
|    ├── boot.js  #boot
|    ├── home.js  #home page
|    ├── issuelist.js #issue list widget
|    ├── issues.js #issues page
|    ├── labels.js #labels page
|    ├── menu.js #menu panel
|    ├── pull2refresh.less #pull2refresh widget
|    └── side.html  #side panel
├── css/
|    ├── boot.less  #import other less files
|    ├── github.less  #github highlight style
|    ├── home.less  #home page style
|    ├── issuelist.less #issue list widget style
|    ├── issues.less #issues page style
|    ├── labels.less #labels page style
|    ├── main.less #commo style
|    ├── markdown.less #markdown format style
|    ├── menu.less #menu panel style
|    ├── normalize.less #normalize style
|    ├── pull2refresh.less #pull2refresh widget style
|    └── side.html  #side panel style
├── dev.html #used to develop
├── favicon.ico #website icon
├── Gruntfile.js #Grunt task config
├── index.html #used to runtime
└── package.json  #nodejs install config

Customization

Browser http://localhost/spring/dev.html, enter the development mode.
Changes you want to modify the source code, like css, js etc.
Refresh dev.html view change.

Building

You will need Node.js installed on your system.
Installation package.

bash

$ npm install

*   Run grunt task.

    ```bash
$ grunt

Browser http://localhost/spring/index.html, enter the runtime mode.
If there is no problem, commit and push the code.
Don't forget to merge master branch into gh-pages branch if you have.
And you're done! Good luck!

Report a bug

Check if the bug is already fixed in the master branch since the last release.
Check existing issues.
Open a new one, including exact browser & platform information.

Who used

If you are using, please tell me.

Download Details:
Author: zhaoda
Source Code: https://github.com/zhaoda/spring
License: MIT License

#spring #spring-framework #spring-boot #java

Dylan Iqbal

1629778075

Java Microservices with Spring Boot, Spring WebFlux and JHipster

This video shows how to create a reactive microservices architecture using Spring Boot, Spring WebFlux, and JHipster.

#java #microservices #springboot #spring #webflux #jhipster

Seamus Quitzon

1603297200

Minions in Minikube - A Kubernetes Intro for Java Developers

We want our microservices to be replicable, replaceable workers that we can easily upgrade or downgrade without any downtime and minimal management. We might say we want them to be our minions. In this article we’ll walk through a simple example to see what Kubernetes can do for us by creating and orchestrating an army of minions. You can code along with this article or clone the project from here.

Prerequisites

We will need to containerize our microservices to run them in Kubernetes—we’ll use Docker for this. Rather than using a cloud-hosted Kubernetes we’ll use Minikube so that we can sandbox locally.

The Aim

Our minion army will be Java microservices. We want different types of minions in our army so that we see what Kubernetes can do for us. So we’ll aim for each microservice to respond to a simple http request with a response like:

We’ll use ASCII art to represent the minion types.

Building a Java Minion Service

We can kickstart our microservice as a Spring Boot Web app using the Spring Initializr with the Web starter dependency:

In the project we’ll create a Controller annoted with @RestController to handle requests. We’ll use an @RequestMapping(method=GET) to provide a response body. So to start with we can do something like:

@RequestMapping( method=GET)
@ResponseBody
public String minion() throws UnknownHostException {

   StringBuilder stringBuilder = new StringBuilder();
   stringBuilder.append("Host: ").append(InetAddress.getLocalHost().getHostName()).append("&lt;br/&gt;");
   return stringBuilder.toString();

}

But this won’t quite give us what we want. We could output the ASCII art here but which minion type do we choose? For this we can use a trick. We’ll create one app that can take the form of any minion type we choose. To do that we’ll need it to contain a library of ASCII art minions. So we create a class called MinionsLibrary that we annotate with @Component and inside we create a map that we initialise with some minions from this blog :

@Component
public class MinionsLibrary {

    private Map&lt;String,String&gt; map = new HashMap&lt;&gt;();

    public MinionsLibrary(){

      map.put("one-eyed-minion",&lt;COPY-PASTE MINION ASCII ART HERE&gt;);
      map.put("two-eyed-minion",&lt;COPY-PASTE MINION ASCII ART HERE&gt;);
      map.put("sad-minion",&lt;COPY-PASTE MINION ASCII ART HERE&gt;);
      map.put("happy-minion",&lt;COPY-PASTE MINION ASCII ART HERE&gt;);

    }
}

#java #devops #microservices #docker #spring boot #kubernetes #introduction #spring boot 2 #minikube #spring boot microservices