[JAVA] Introduction to Micronaut 1 ~ Introduction ~

Purpose

Spring type FW is often adopted in SIer, but Micronaut is influenced by existing famous FW, so the introduction barrier seems not to be so high and it is a technology that overcomes the drawbacks of existing FW. A memo after the investigation.

What is Micronaut

A modern JVM-based full-stack microservices framework designed for building microservices applications. Micronaut provides all the functionality to build microservices. At the same time, it provides the following to avoid the shortcomings of frameworks like Spring, Spring Boot, and Grails:

Fast startup time
Reduced memory footprint
Minimal use of reflection
Minimal use of proxies
Easy unit testing

Although it seems that it is not suitable for the SI industry due to its business model, it is designed for microservices.

Environment

--Java 8 or higher SDK is included --Install Micronaut CLI with SDKMAN

Installing SDKMAN

$ curl -s "https://get.sdkman.io" | bash
$ source "$HOME/.sdkman/bin/sdkman-init.sh"
$ sdk update
$ sdk install micronaut 1.1.0.M1

Creating a server app

Creating a template project

--features file-watch has auto-reload function

$ mn create-app my-app --features file-watch
$ cd my-app
$ ./gradlew run --continuous

Creating a controller

`HelloController.java`


import io.micronaut.http.MediaType;
import io.micronaut.http.annotation.Controller;
import io.micronaut.http.annotation.Get;

@Controller("/hello")
public class HelloController {
    @Get(produces = MediaType.TEXT_PLAIN)
    public String index() {
        return "hello world!!";
    }
}

http://localhost:8080/hello Hello world !! is displayed by accessing. It detects file changes and restarts. It doesn't start up anymore, and I don't feel any lightness.

reference

https://docs.micronaut.io/1.1.0.M1/guide/index.html

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