[LINE BOT] I made a ramen BOT with Java (Maven) + Heroku + Spring Boot (1)

Create a reply function by connecting Heroku and LINE API!

I want to make a ramen bot using the LINE API! so First of all, use Java LINE Bot SDK to create an "echo" bot that returns parrots. ▼ Implemented with reference to the following URL "Create a sample bot on Heroku" https://developers.line.me/ja/docs/messaging-api/building-sample-bot-with-heroku/

Tools used

LINE Messaging API -Java LINE Bot SDK ・ Heroku ・ Java


  1. Set up the LINE Messaging API
  2. Set up Heroku
  3. Generate Maven Project
  4. Deploy to Heroku

Create Maven project





2.application.yml Acccess Token and Channel Secret are generated when you create a new channel with the LINE Messaging API


  channel-token: 'AcccessToken'
  channel-secret: 'Channel Secret'
  handler.path: /callback

3.Procfile ★ ☆ Point ☆ ★

  1. Generate a file under the root directory
  2. The file name is "Procfile" * The first "P" is capitalized! https://devcenter.heroku.com/articles/procfile


web: java $JAVA_OPTS -jar target/{APPNAME}-0.0.1-SNAPSHOT.jar --server.port=$PORT

4.App.java I copied the code in the Java LINE Bot SDK.


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

	public TextMessage handleTextMessageEvent(MessageEvent<TextMessageContent> event) {
		System.out.println("event: " + event);
		return new TextMessage(event.getMessage().getText());

	public void handleDefaultMessageEvent(Event event) {
		System.out.println("event: " + event);

Deploy to Heroku!

//Local repository generation, commit
$ git init
$ git add -A  
$ git commit

//Login to heroku from CLI tool
$ heroku login

//Web application generation in Heroku (remote repository is also generated at this time)
$ heroku create APPNAME 

//Link local repository and remote repository
$ heroku git:remote --app APPNAME 

git push heroku master

Webhook settings

・ Send Webhook ⇒ Use ・ Webhook URL ⇒ https: // {APPNAME} .herokuapp.com / callback {APPNAME} is the name of the application you created


** OK if the connection is confirmed successfully! !! ** **

You have now implemented the reply function! !!

I thought it was easy, but I struggled because the LINE Message API and heroku didn't connect. Please refer to it ☆ Next time, we will implement Ramen BOT.

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