[JAVA] Spring Boot starting with copy

For people who start Spring Boot from scratch, I will write an article with the goal of moving something if I copy it for the time being. Basic Building a RESTful Web Service is used as a reference.


$ sw_vers
ProductName:	Mac OS X
ProductVersion:	10.14.3
BuildVersion:	18D109
$ mvn --version
Apache Maven 3.6.0 (97c98ec64a1fdfee7767ce5ffb20918da4f719f3; 2018-10-25T03:41:47+09:00)
Maven home: /usr/local/Cellar/maven/3.6.0/libexec
Java version: 1.8.0_25, vendor: Oracle Corporation, runtime: /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/jre
Default locale: ja_JP, platform encoding: UTF-8
OS name: "mac os x", version: "10.14.3", arch: "x86_64", family: "mac"

It's a so-called normal Mac, but if you have Maven, you can run it on Windows with almost the same procedure.

I will also communicate with curl.

$ curl --version
curl 7.54.0 (x86_64-apple-darwin18.0) ...


First, let's copy and paste pom.xml from the following.

$ mkdir myproject && cd $_
$ cat pom.xml


<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">



    <!-- Additional lines to be added here... -->

    <!-- (you don't need this if you are using a .RELEASE version) -->



Create a directory where you want to place the source and properties files.

$ mkdir -p src/main/java
$ mkdir -p src/main/resources

Create a file written by the magic that starts Spring Boot.

$ cat src/main/java/nu/mine/kino/springboot/SampleTomcatApplication.java


package nu.mine.kino.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

public class SampleTomcatApplication {
	public static void main(String[] args) {
		SpringApplication.run(SampleTomcatApplication.class, args);


Create the following Controller that describes the WEB function.

$ cat src/main/java/nu/mine/kino/springboot/GreetingController.java


package nu.mine.kino.springboot;

import java.util.concurrent.atomic.AtomicLong;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

public class GreetingController {

    private static final String template = "Hello, %s!";

    private final AtomicLong counter = new AtomicLong();

    public Greeting greeting(
            @RequestParam(value = "name", defaultValue = "World") String name) {
        return new Greeting(counter.incrementAndGet(),
                String.format(template, name));

class Greeting {

    private final long id;

    private final String content;

    public Greeting(long id, String content) {
        this.id = id;
        this.content = content;

    public long getId() {
        return id;

    public String getContent() {
        return content;

Create a properties file that describes your preferences.

$ cat src/main/resources/application.properties


server.compression.enabled: true
server.compression.min-response-size: 1

server.port is the port number to start. If the default 8080 is acceptable, no description is actually required. server.address is a magical trick to connect from other machines.


Let's start it.

$ pwd

$ mvn spring-boot:run

Various things are displayed,
2019-02-26 14:03:46.797  INFO 40644 --- [           main] n.m.k.s.SampleTomcatApplication          : 
Started SampleTomcatApplication in 4.749 seconds (JVM running for 11.845)

It's OK!

After starting, try communicating from another prompt.

$ curl http://localhost:8080/greeting
{"id":1,"content":"Hello, World!"}

It worked so well!

Stop the Spring Boot WEB server (Tomcat) that you started with Ctrl-C. Thank you for your support.



$ mvn clean package

Now you have an executable jar file that includes Tomcat.

$ java -jar target/myproject-0.0.1-SNAPSHOT.jar

By doing so, Tomcat will start in the same way as the previous mvn spring-boot: run. ..

Load with Eclipse

$ mvn eclipse:clean eclipse:eclipse

Now that you have a .project / .classpath file, you can import it into Eclipse.

Format the JSON of the return value and return it

Add the following settings to application.properties.

$ cat src/main/resources/application.properties



When I press Ctrl-C and restart with mvn spring-boot: run and then connect with curl, ...

$ curl http://localhost:8080/greeting
  "id" : 1,
  "content" : "Hello, World!"

The JSON has been formatted. ..

Related Links

-Spring Boot Official

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